host_cache

This page is part of MariaDB's Documentation.

The parent of this page is: Performance Schema for MariaDB Enterprise Server

Topics on this page:

Overview
USAGE
DETAILS
- SYNONYMS
- SCHEMA
- PARAMETERS
- SKYSQL
- PRIVILEGES
EXAMPLES
ERROR HANDLING
FEATURE INTERACTION
RESPONSES
DIAGNOSIS
ISO 9075:2016
CHANGE HISTORY
RELATED TOPICS
EXTERNAL REFERENCES

Overview

A description for this Performance-schema Table has not yet been added to this Documentation.

USAGE

DETAILS

SYNONYMS

SCHEMA

CREATE TABLE `host_cache` (
  `IP` varchar(64) NOT NULL COMMENT 'Client IP address.',
  `HOST` varchar(255) CHARACTER SET utf8mb3 COLLATE utf8mb3_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.',
  `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.',
  `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.',
  `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.',
  `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.',
  `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.',
  `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.',
  `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.',
  `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.',
  `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.',
  `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.',
  `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.',
  `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.',
  `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.',
  `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.',
  `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.',
  `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.',
  `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.',
  `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.',
  `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.',
  `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.',
  `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.',
  `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.',
  `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.',
  `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the first connection attempt by the IP.',
  `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent connection attempt by the IP.',
  `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the first error seen from the IP.',
  `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.'
)

PARAMETERS

SKYSQL

PRIVILEGES

EXAMPLES

ERROR HANDLING

FEATURE INTERACTION

RESPONSES

DIAGNOSIS

ISO 9075:2016

CHANGE HISTORY

Release Series	History
10.6 Enterprise	Schema changed in MariaDB Enterprise Server 10.6.4-1: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL, `HOST` varchar(255) CHARACTER SET utf8mb3 COLLATE utf8_binutf8mb3_bin DEFAULT NULL, `HOST_VALIDATED` enum('YES','NO') NOT NULL, `SUM_CONNECT_ERRORS` bigint(20) NOT NULL, `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL, `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL, `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL, `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL, `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL, `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL, `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL, `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL, `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL, `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL, `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL, `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL, `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL, `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL, `COUNT_SSL_ERRORS` bigint(20) NOT NULL, `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL, `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL, `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL, `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL, `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL, `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL, `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' ) Schema changed in MariaDB Enterprise Server 10.6.5-2: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8mb3 COLLATE utf8mb3_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.6 Community	Present starting in MariaDB Community Server 10.6.0. Schema changed in MariaDB Community Server 10.6.1: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL, `HOST` varchar(255) CHARACTER SET utf8mb3 COLLATE utf8_binutf8mb3_bin DEFAULT NULL, `HOST_VALIDATED` enum('YES','NO') NOT NULL, `SUM_CONNECT_ERRORS` bigint(20) NOT NULL, `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL, `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL, `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL, `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL, `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL, `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL, `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL, `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL, `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL, `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL, `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL, `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL, `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL, `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL, `COUNT_SSL_ERRORS` bigint(20) NOT NULL, `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL, `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL, `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL, `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL, `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL, `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL, `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' ) Schema changed in MariaDB Community Server 10.6.5: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8mb3 COLLATE utf8mb3_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.5 Enterprise	Present starting in MariaDB Enterprise Server 10.5.3-1. Schema changed in MariaDB Enterprise Server 10.5.13-9: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.5 Community	Present starting in MariaDB Community Server 10.5.0. Schema changed in MariaDB Community Server 10.5.13: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.4 Enterprise	Present starting in MariaDB Enterprise Server 10.4.6-1. Schema changed in MariaDB Enterprise Server 10.4.22-14: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.4 Community	Present starting in MariaDB Community Server 10.4.0. Schema changed in MariaDB Community Server 10.4.22: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.3 Enterprise	Present starting in MariaDB Enterprise Server 10.3.16-1. Schema changed in MariaDB Enterprise Server 10.3.32-14: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.3 Community	Present starting in MariaDB Community Server 10.3.0. Schema changed in MariaDB Community Server 10.3.32: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.2 Enterprise	Present starting in MariaDB Enterprise Server 10.2.25-1. Schema changed in MariaDB Enterprise Server 10.2.41-14: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.2 Community	Present starting in MariaDB Community Server 10.2.0. Schema changed in MariaDB Community Server 10.2.41: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )

Release Series	History
10.6 Enterprise	Schema changed in MariaDB Enterprise Server 10.6.4-1: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL, `HOST` varchar(255) CHARACTER SET utf8mb3 COLLATE utf8_binutf8mb3_bin DEFAULT NULL, `HOST_VALIDATED` enum('YES','NO') NOT NULL, `SUM_CONNECT_ERRORS` bigint(20) NOT NULL, `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL, `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL, `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL, `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL, `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL, `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL, `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL, `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL, `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL, `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL, `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL, `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL, `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL, `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL, `COUNT_SSL_ERRORS` bigint(20) NOT NULL, `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL, `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL, `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL, `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL, `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL, `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL, `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' ) Schema changed in MariaDB Enterprise Server 10.6.5-2: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8mb3 COLLATE utf8mb3_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.5 Enterprise	Present starting in MariaDB Enterprise Server 10.5.3-1. Schema changed in MariaDB Enterprise Server 10.5.13-9: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )
10.4 Enterprise	Present starting in MariaDB Enterprise Server 10.4.6-1. Schema changed in MariaDB Enterprise Server 10.4.22-14: ... CREATE TABLE `host_cache` ( `IP` varchar(64) NOT NULL COMMENT 'Client IP address.', `HOST` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT 'IP''s resolved DNS host name, or NULL if unknown.', `HOST_VALIDATED` enum('YES','NO') NOT NULL COMMENT 'YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.', `SUM_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.', `COUNT_HOST_BLOCKED_ERRORS` bigint(20) NOT NULL COMMENT 'Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.', `COUNT_NAMEINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during IP-to-host DNS lookups.', `COUNT_NAMEINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during IP-to-host DNS lookups.', `COUNT_FORMAT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of host name format errors, for example a numeric host column.', `COUNT_ADDRINFO_TRANSIENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of transient errors during host-to-IP reverse DNS lookups.', `COUNT_ADDRINFO_PERMANENT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of permanent errors during host-to-IP reverse DNS lookups.', `COUNT_FCRDNS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.', `COUNT_HOST_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.', `COUNT_NO_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.', `COUNT_AUTH_PLUGIN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.', `COUNT_HANDSHAKE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected at the wire protocol level.', `COUNT_PROXY_USER_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that does not exist.', `COUNT_PROXY_USER_ACL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn''t have the PROXY privilege.', `COUNT_AUTHENTICATION_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors where authentication failed.', `COUNT_SSL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to TLS problems.', `COUNT_MAX_USER_CONNECTIONS_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-user quota being exceeded.', `COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the per-hour quota being exceeded.', `COUNT_DEFAULT_DATABASE_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to the user not having permission to access the specified default database, or it not existing.', `COUNT_INIT_CONNECT_ERRORS` bigint(20) NOT NULL COMMENT 'Number of errors due to statements in the init_connect system variable.', `COUNT_LOCAL_ERRORS` bigint(20) NOT NULL COMMENT 'Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.', `COUNT_UNKNOWN_ERRORS` bigint(20) NOT NULL COMMENT 'Number of unknown errors that cannot be allocated to another column.', `FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first connection attempt by the IP.', `LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the most recent connection attempt by the IP.', `FIRST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00',' COMMENT 'Timestamp of the first error seen from the IP.', `LAST_ERROR_SEEN` timestamp NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Timestamp of the most recent error seen from the IP.' )

EXTERNAL REFERENCES

Additional information on this topic may be found in the MariaDB Public Knowledge Base.

host_cache

Overview

USAGE

DETAILS

SYNONYMS

SCHEMA

PARAMETERS

SKYSQL

PRIVILEGES

EXAMPLES

ERROR HANDLING

FEATURE INTERACTION

RESPONSES

DIAGNOSIS

ISO 9075:2016

CHANGE HISTORY

RELATED TOPICS

EXTERNAL REFERENCES