Server Status Variables

The full list of status variables are listed in the contents on this page; most are described on this page, but some are described elsewhere:

• Aria Status Variables
• Galera Status Variables
• Mroonga Status Variables
• Replication and Binary Log Status Variables
• Server_Audit Status Variables
• Sphinx Status Variables
• Spider Status Variables
• XtraDB/InnoDB Status Variables

See also the Full list of MariaDB options, system and status variables.

Use the SHOW STATUS statement to view status variables. This information also can be obtained using the mysqladmin extended-status command, or by querying the Information Schema GLOBAL_STATUS and SESSION_STATUS tables.

Issuing a FLUSH STATUS will reset many status variables to zero.

List of Server Status Variables

Aborted_clients

• Description: Number of aborted client connections. This can be due to the client not calling mysql_close() before exiting, the client sleeping without issuing a request to the server for more seconds than specified by wait_timeout or interactive_timeout, or by the client program ending in the midst of transferring data.
• Scope: Global
• Data Type: numeric

---

Aborted_connects

• Description: Number of failed server connection attempts. This can be due to a client using an incorrect password, a client not having privileges to connect to a database, a connection packet not containing the correct information, or if it takes more than connect_timeout seconds to get a connect packet.
• Scope: Global
• Data Type: numeric

---

Access_denied_errors

• Description: Number of access denied errors.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.2

---

Acl_column_grants

• Description: Number of column permissions granted (rows in the mysql.columns_priv table).
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.4

---

Acl_database_grants

• Description: Number of database permissions granted (rows in the mysql.db table).
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.4

---

Acl_function_grants

• Description: Number of function permissions granted (rows in the mysql.procs_priv table with a routine type of FUNCTION).
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.4

---

Acl_procedure_grants

• Description: Number of procedure permissions granted (rows in the mysql.procs_priv table with a routine type of PROCEDURE).
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.4

---

Busy_time

• Description: Cumulative time in seconds of activity on connections.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Bytes_received

• Description: Total bytes received from all clients.
• Scope: Global
• Data Type: numeric

---

Bytes_sent

• Description: Total bytes sent to all clients.
• Scope: Global, Session
• Data Type: numeric

---

Com_admin_commands

• Description: Number of admin commands executed. These include table dumps, change users, binary log dumps, shutdowns, pings and debugs.
• Scope: Global, Session
• Data Type: numeric

---

Com_alter_db

• Description: Number of ALTER DATABASE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_alter_db_upgrade

• Description: Number of ALTER DATABASE ... UPGRADE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_alter_event

• Description: Number of ALTER EVENT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_alter_function

• Description: Number of ALTER FUNCTION commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_alter_procedure

• Description: Number of ALTER PROCEDURE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_alter_server

• Description: Number of ALTER SERVER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_alter_table

• Description: Number of ALTER TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_alter_tablespace

• Description: Number of ALTER TABLESPACE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_analyze

• Description: Number of ANALYZE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_assign_to_keycache

• Description: Number of assign to keycache commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_backup_table

• Description: Removed in MariaDB 5.5, in older versions, Com_backup_table contains the number of BACKUP TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric
• Removed: MariaDB 5.5

---

Com_begin

• Description: Number of BEGIN statements executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_binlog

• Description: Number of BINLOG commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_call_procedure

• Description: Number of CALL procedure_name statements executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_change_db

• Description: Number of USE database_name commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_check

• Description: Number of CHECK TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_checksum

• Description: Number of CHECKSUM TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_commit

• Description: Number of COMMIT commands executed. Differs from Handler_commit, which counts internal commit statements.
• Scope: Global, Session
• Data Type: numeric

---

Com_compound_sql

• Description: Number of compund sql statements.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.1.1

---

Com_create_db

• Description: Number of CREATE DATABASE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_event

• Description: Number of CREATE EVENT commands executed. Differs from Executed_events in that it is incremented when the CREATE EVENT is run, and not when the event executes.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_function

• Description: Number of CREATE FUNCTION commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_index

• Description: Number of CREATE INDEX commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_procedure

• Description: Number of CREATE PROCEDURE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_role

• Description: Number of CREATE ROLE commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.5

---

Com_create_server

• Description: Number of CREATE SERVER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_table

• Description: Number of CREATE TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_trigger

• Description: Number of CREATE TRIGGER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_udf

• Description: Number of CREATE UDF commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_user

• Description: Number of CREATE USER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_create_view

• Description: Number of CREATE VIEW commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_dealloc_sql

• Description: Number of DEALLOCATE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_delete

• Description: Number of DELETE commands executed. Differs from Handler_delete, which counts the number of times rows have been deleted from tables.
• Scope: Global, Session
• Data Type: numeric

---

Com_delete_multi

• Description: Number of multi-table DELETE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_do

• Description: Number of DO commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_db

• Description: Number of DROP DATABASE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_event

• Description: Number of DROP EVENT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_function

• Description: Number of DROP FUNCTION commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_index

• Description: Number of DROP INDEX commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_procedure

• Description: Number of DROP PROCEDURE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_role

• Description: Number of DROP ROLE commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.5

---

Com_drop_server

• Description: Number of DROP SERVER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_table

• Description: Number of DROP TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_trigger

• Description: Number of DROP TRIGGER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_user

• Description: Number of DROP USER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_drop_view

• Description: Number of DROP VIEW commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_empty_query

• Description: Number of queries to the server that do not produce SQL queries. An SQL query simply returning no results does not increment Com_empty_query - see Empty_queries instead. An example of an empty query sent to the server is mysql --comments -e '-- sql comment'
• Scope: Global, Session
• Data Type: numeric

---

Com_execute_sql

• Description: Number of EXECUTE statements executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_flush

• Description: Number of FLUSH commands executed. This differs from Flush_commands, which also counts internal server flush requests.
• Scope: Global, Session
• Data Type: numeric

---

Com_get_diagnostics

• Description: Number of GET DIAGNOSTICS commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.4 / MySQL 5.6.4

---

Com_grant

• Description: Number of GRANT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_grant_role

• Description: Number of GRANT role commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.5

---

Com_ha_close

• Description: Number of HANDLER table_name CLOSE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_ha_open

• Description: Number of HANDLER table_name OPEN commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_ha_read

• Description: Number of HANDLER table_name READ commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_help

• Description: Number of HELP commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_insert

• Description: Number of INSERT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_insert_select

• Description: Number of INSERT ... SELECT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_install_plugin

• Description: Number of INSTALL PLUGIN commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_kill

• Description: Number of KILL commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_load

• Description: Number of LOAD commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_load_master_data

• Description:
• Scope: Global, Session
• Data Type: numeric
• Removed: MariaDB 5.5

---

Com_load_master_table

• Description:
• Scope: Global, Session
• Data Type: numeric
• Removed: MariaDB 5.5

---

Com_lock_tables

• Description: Number of [lock-tables|LOCK TABLES]] commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_optimize

• Description: Number of OPTIMIZE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_preload_keys

• Description:
• Scope: Global, Session
• Data Type: numeric

---

Com_prepare_sql

• Description: Number of PREPARE statements executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_purge

• Description: Number of PURGE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_purge_before_date

• Description: Number of PURGE BEFORE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_release_savepoint

• Description: Number of RELEASE SAVEPOINT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_rename_table

• Description: Number of RENAME TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_rename_user

• Description: Number of RENAME USER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_repair

• Description: Number of REPAIR TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_replace

• Description: Number of REPLACE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_replace_select

• Description: Number of REPLACE ... SELECT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_reset

• Description: Number of RESET commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_resignal

• Description: Number of RESIGNAL commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Com_restore_table

• Description:
• Scope: Global, Session
• Data Type: numeric
• Removed: MariaDB 5.5

---

Com_revoke

• Description: Number of REVOKE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_revoke_all

• Description: Number of REVOKE ALL commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_revoke_grant

• Description: Number of REVOKE role commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.5

---

Com_rollback

• Description: Number of ROLLBACK commands executed. Differs from Handler_rollback, which is the number of transaction rollback requests given to a storage engine.
• Scope: Global, Session
• Data Type: numeric

---

Com_rollback_to_savepoint

• Description: Number of ROLLBACK ... TO SAVEPOINT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_savepoint

• Description: Number of SAVEPOINT commands executed. Differs from Handler_savepoint, which is the number of transaction savepoint creation requests.
• Scope: Global, Session
• Data Type: numeric

---

Com_select

• Description: Number of SELECT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_set_option

• Description: Number of SET OPTION commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_signal

• Description: Number of SIGNAL statements executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Com_show_authors

• Description: Number of SHOW AUTHORS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_binlog_events

• Description: Number of SHOW BINLOG EVENTS statements executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_binlogs

• Description: Number of SHOW BINARY LOGS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_charsets

• Description: Number of SHOW CHARACTER SET commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_client_statistics

• Description: Number of SHOW CLIENT STATISTICS commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.2

---

Com_show_collations

• Description: Number of SHOW COLLATION commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_column_types

• Description:
• Scope: Global, Session
• Data Type: numeric
• Removed: MariaDB 5.5

---

Com_show_contributors

• Description: Number of SHOW CONTRIBUTORS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_create_db

• Description: Number of SHOW CREATE DATABASE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_create_event

• Description: Number of SHOW CREATE EVENT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_create_func

• Description: Number of SHOW CREATE FUNCTION commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_create_proc

• Description: Number of SHOW CREATE PROCEDURE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_create_table

• Description: Number of SHOW CREATE TABLE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_create_trigger

• Description: Number of SHOW CREATE TRIGGER commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_databases

• Description: Number of SHOW DATABASES commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_engine_logs

• Description: Number of SHOW ENGINE LOGS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_engine_mutex

• Description: Number of SHOW ENGINE MUTEX commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_engine_status

• Description: Number of SHOW ENGINE STATUS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_events

• Description: Number of SHOW EVENTS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_errors

• Description: Number of SHOW ERRORS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_explain

• Description: Number of SHOW EXPLAIN commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

---

Com_show_fields

• Description: Number of SHOW COLUMNS or SHOW FIELDS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_function_status

• Description: Number of SHOW FUNCTION STATUS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_generic

• Description: Number of generic SHOW commands executed, such as SHOW INDEX_STATISTICS and SHOW TABLE_STATISTICS
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.1.1

---

Com_show_grants

• Description: Number of SHOW GRANTS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_keys

• Description: Number of SHOW INDEX or SHOW KEYS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_index_statistics

• Description: Number of SHOW INDEX_STATISTICS commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.2

---

Com_show_open_tables

• Description: Number of SHOW OPEN TABLES commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_plugins

• Description: Number of SHOW PLUGINS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_privileges

• Description: Number of SHOW PRIVILEGES commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_procedure_status

• Description: Number of SHOW PROCEDURE STATUS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_processlist

• Description: Number of SHOW PROCESSLIST commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_profile

• Description: Number of SHOW PROFILE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_profiles

• Description: Number of SHOW PROFILES commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_relaylog_events

• Description: Number of SHOW RELAYLOG EVENTS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_status

• Description: Number of SHOW STATUS commands executed.
• Scope: Global, Session
• Data Type: numericst

---

Com_show_storage_engines

• Description: Number of SHOW STORAGE ENGINES - or SHOW ENGINES - commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_table_statistics

• Description: Number of SHOW TABLE STATISTICS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_table_status

• Description: Number of SHOW TABLE STATUS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_tables

• Description: Number of SHOW TABLES commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_triggers

• Description: Number of SHOW TRIGGERS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_user_statistics

• Description: Number of SHOW USER STATISTICS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_variable

• Description: Number of SHOW VARIABLES commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_show_warnings

• Description: Number of SHOW WARNINGS commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_shutdown

• Description: Number of SHUTDOWN commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_stmt_close

• Description: Number of prepared statements closed (deallocated or dropped).
• Scope: Global, Session
• Data Type: numeric

---

Com_stmt_execute

• Description: Number of prepared statements executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_stmt_fetch

• Description: Number of prepared statements fetched.
• Scope: Global, Session
• Data Type: numeric

---

Com_stmt_prepare

• Description: Number of prepared statements prepared.
• Scope: Global, Session
• Data Type: numeric

---

Com_stmt_reprepare

• Description: Number of prepared statements reprepared.
• Scope: Global, Session
• Data Type: numeric

---

Com_stmt_reset

• Description: Number of prepared statements where the data of a prepared statement which was accumulated in chunks by sending long data has been reset.
• Scope: Global, Session
• Data Type: numeric

---

Com_stmt_send_long_data

• Description: Number of prepared statements where the parameter data has been sent in chunks (long data).
• Scope: Global, Session
• Data Type: numeric

---

Com_truncate

• Description: Number of TRUNCATE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_uninstall_plugin

• Description: Number of UNINSTALL PLUGIN commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_unlock_tables

• Description: Number of UNLOCK TABLES commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_update

• Description: Number of UPDATE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_update_multi

• Description: Number of multi-table UPDATE commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_xa_commit

• Description: Number of XA statements committed.
• Scope: Global, Session
• Data Type: numeric

---

Com_xa_end

• Description: Number of XA statements ended.
• Scope: Global, Session
• Data Type: numeric

---

Com_xa_prepare

• Description: Number of XA statements prepared.
• Scope: Global, Session
• Data Type: numeric

---

Com_xa_recover

• Description: Number of XA RECOVER statements executed.
• Scope: Global, Session
• Data Type: numeric

---

Com_xa_rollback

• Description: Number of XA statements rolled back.
• Scope: Global, Session
• Data Type: numeric

---

Com_xa_start

• Description: Number of XA statements started.
• Scope: Global, Session
• Data Type: numeric

---

Compression

• Description: Whether client-server traffic is compressed.
• Scope: Session
• Data Type: boolean

---

Connection_errors_accept

• Description: Number of errors that occurred during calls to accept() on the listening port.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.0.4 / MySQL 5.6.5

---

Connection_errors_internal

• Description: Number of refused connections due to internal server errors, for example out of memory errors, or failed thread starts.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.0.4 / MySQL 5.6.5

---

Connection_errors_max_connections

• Description: Number of refused connections due to the max_connections limit being reached.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.0.4 / MySQL 5.6.5

---

Connection_errors_peer_address

• Description: Number of errors while searching for the connecting client IP address.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.0.4 / MySQL 5.6.5

---

Connection_errors_select

• Description: Number of errors during calls to select() or poll() on the listening port. The client would not necessarily have been rejected in these cases.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.0.4 / MySQL 5.6.5

---

Connection_errors_tcpwrap

• Description: Number of connections the libwrap library refused.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.0.4 / MySQL 5.6.5

---

Connections

• Description: Number of connection attempts (both successful and unsuccessful)
• Scope: Global
• Data Type: numeric

---

Cpu_time

• Description: Total CPU time used.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Created_tmp_disk_tables

• Description: Number of on-disk temporary tables created.
• Scope: Global, Session
• Data Type: numeric

---

Created_tmp_files

• Description: Number of in-memory temporary tables created.
• Scope: Global
• Data Type: numeric

---

Created_tmp_tables

• Description: Number of temporary tables created.
• Scope: Global
• Data Type: numeric

---

Delayed_errors

• Description: Number of errors which occurred while doing INSERT DELAYED.
• Scope: Global
• Data Type: numeric

---

Delayed_insert_threads

• Description: Number of INSERT DELAYED threads.
• Scope: Global
• Data Type: numeric

---

Delayed_writes

• Description: Number of INSERT DELAYED rows written..
• Scope: Global
• Data Type: numeric

---

Empty_queries

• Description: Number of queries returning no results. Note this is not the same as Com_empty_query.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.2

---

Executed_events

• Description: Number of times events created with CREATE EVENT have executed. This differs from Com_create_event in that it is only incremented when the event has run, not when it executes.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5.28

---

Executed_triggers

• Description: Number of times triggers created with CREATE TRIGGER have executed. This differs from Com_create_trigger in that it is only incremented when the trigger has run, not when it executes.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5.28

---

Feature_delay_key_write

• Description: Number of tables opened that are using delay_key_write.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.0.13

---

Feature_dynamic_columns

• Description: Number of times the COLUMN_CREATE() function was used.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Feature_fulltext

• Description: Number of times the MATCH … AGAINST() function was used.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Feature_gis

• Description: Number of times a table with a any of the geometry columns was opened.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Feature_locale

• Description: Number of times the @@lc_messages variable was assigned into.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Feature_subquery

• Description: Number of subqueries (excluding subqueries in the FROM clause) used.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Feature_timezone

• Description: Number of times an explicit timezone (excluding UTC and SYSTEM) was specified.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Feature_trigger

• Description: Number of triggers loaded.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Feature_xml

• Description: Number of times XML functions (EXTRACTVALUE() and UPDATEXML()) were used.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Flush_commands

• Description: Number of FLUSH statements executed, as well as due to internal server flush requests. This differs from Com_flush, which simply counts FLUSH statements, not internal server flush operations.
• Scope: Global
• Data Type: numeric

---

Handler_commit

• Description: Number of internal COMMIT requests. Differs from Com_commit, which counts the number of COMMIT statements executed.
• Scope: Global, Session
• Data Type: numeric

---

Handler_delete

• Description: Number of times rows have been deleted from tables. Differs from Com_delete, which counts DELETE statements.
• Scope: Global, Session
• Data Type: numeric

---

Handler_discover

• Description: Discovery is when the server asks the NDBCLUSTER storage engine if it knows about a table with a given name. Handler_discover indicates the number of times that tables have been discovered in this way.
• Scope: Global, Session
• Data Type: numeric

---

Handler_external_lock

• Description: Incremented for each call to the external_lock() function, which generally occurs at the beginning and end of access to a table instance.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

---

Handler_icp_attempts

• Description: Number of times pushed index condition was checked. The smaller the ratio of Handler_icp_attempts to Handler_icp_match the better the filtering. See Index Condition Pushdown.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Handler_icp_match

• Description: Number of times pushed index condition was matched. The smaller the ratio of Handler_icp_attempts to Handler_icp_match the better the filtering. See See Index Condition Pushdown.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Handler_mrr_init

• Description: Counts how many MRR (multi-range read) scans were performed. See Multi Range Read optimization.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Handler_mrr_key_refills

• Description: Number of times key buffer was refilled (not counting the initial fill). A non-zero value indicates there wasn't enough memory to do key sort-and-sweep passes in one go. See Multi Range Read optimization.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Handler_mrr_rowid_refills

• Description: Number of times rowid buffer was refilled (not counting the initial fill). A non-zero value indicates there wasn't enough memory to do rowid sort-and-sweep passes in one go. See Multi Range Read optimization.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Handler_prepare

• Description: Number of two-phase commit prepares.
• Scope: Global, Session
• Data Type: numeric

---

Handler_read_first

• Description: Number of requests to read the first row from an index. A high value indicates many full index scans, e.g. SELECT a FROM table_name where a is an indexed column.
• Scope: Global, Session
• Data Type: numeric

---

Handler_read_key

• Description: Number of row read requests based on an index value. A high value indicates indexes are regularly being used, which is usually positive.
• Scope: Global, Session
• Data Type: numeric

---

Handler_read_last

• Description: Number of requests to read the last row from an index. ORDER BY DESC results in a last-key request followed by several previous-key requests.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Handler_read_next

• Description: Number of requests to read the next row from an index (in order). Increments when doing an index scan or querying an index column with a range constraint.
• Scope: Global, Session
• Data Type: numeric

---

Handler_read_prev

• Description: Number of requests to read the previous row from an index (in order). Mostly used with ORDER BY DESC.
• Scope: Global, Session
• Data Type: numeric

---

Handler_read_rnd

• Description: Number of requests to read a row based on its position. If this value is high, you may not be using joins that don't use indexes properly, or be doing many full table scans.
• Scope: Global, Session
• Data Type: numeric

---

Handler_read_rnd_deleted

• Description: Number of requests to delete a row based on its position.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Handler_read_rnd_next

• Description: Number of requests to read the next row. A large number of these may indicate many table scans and improperly used indexes.
• Scope: Global, Session
• Data Type: numeric

---

Handler_rollback

• Description: Number of transaction rollback requests given to a storage engine. Differs from Com_rollback, which is the number of ROLLBACK commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Handler_savepoint

• Description: Number of transaction savepoint creation requests. Differs from Com_savepoint which is the number of SAVEPOINT commands executed.
• Scope: Global, Session
• Data Type: numeric

---

Handler_savepoint_rollback

• Description: Number of requests to rollback to a transaction savepoint.
• Scope: Global, Session
• Data Type: numeric

---

Handler_tmp_update

• Description: Number of requests to update a row to a temporary table.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Handler_tmp_write

• Description: Number of requests to write a row to a temporary table.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Handler_update

• Description: Number of requests to update a row in a table. Since MariaDB 5.3, this no longer counts temporary tables - see Handler_tmp_update.
• Scope: Global, Session
• Data Type: numeric

---

Handler_write

• Description: Number of requests to write a row to a table. Since MariaDB 5.3, this no longer counts temporary tables - see Handler_tmp_write.
• Scope: Global, Session
• Data Type: numeric

---

Key_blocks_not_flushed

• Description: Number of key cache blocks which have been modified but not flushed to disk.
• Scope: Global
• Data Type: numeric

---

Key_blocks_unused

• Description: Number of unused key cache blocks.
• Scope: Global
• Data Type: numeric

---

Key_blocks_used

• Description: Max number of key cache blocks which have been used simultaneously.
• Scope: Global
• Data Type: numeric

---

Key_blocks_warm

• Description: Number of key cache blocks in the warm list.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.1

---

Key_read_requests

• Description: Number of key cache block read requests. See Optimizing key_buffer_size.
• Scope: Global
• Data Type: numeric

---

Key_reads

• Description: Number of physical index block reads. See Optimizing key_buffer_size.
• Scope: Global
• Data Type: numeric

---

Key_write_requests

• Description: Number of requests to write a block to the key cache.
• Scope: Global
• Data Type: numeric

---

Key_writes

• Description: Number of key cache block write requests
• Scope: Global
• Data Type: numeric

---

Last_query_cost

• Description: The most recent query optimizer query cost calculation. Can not be calculated for complex queries, such as subqueries or UNION. It will be set to 0 for complex queries.
• Scope: Session
• Data Type: numeric

---

Maria_*

• Description: When the Maria storage engine was renamed Aria, the Maria variables existing at the time were renamed at the same time. See Aria Server Status Variables.

---

Max_statement_time_exceeded

• Description: Number of queries that exceeded the execution time specified by max_statement_time. See Aborting statements that take longer than a certain time to execute.
• Data Type: numeric
• Introduced: MariaDB 10.1.1

---

Max_used_connections

• Description: Max number of connections ever open at the same time.
• Scope: Session
• Data Type: numeric

---

Memory_used

• Description: Global or per-connection memory usage.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.1

---

Not_flushed_delayed_rows

• Description: Number of INSERT DELAYED rows waiting to be written.
• Scope: Global
• Data Type: numeric

---

Open_files

• Description: Number of regular files currently opened by the server. Does not include sockets or pipes, or storage engines using internal functions.
• Scope: Global
• Data Type: numeric

---

Open_streams

• Description: Number of currently opened streams, usually log files.
• Scope: Global
• Data Type: numeric

---

Open_table_definitions

• Description: Number of currently cached .frm files.
• Scope: Global
• Data Type: numeric

---

Open_tables

• Description: Number of currently opened tables, excluding temporary tables.
• Scope: Global, Session
• Data Type: numeric

---

Opened_files

• Description: Number of files the server has opened.
• Scope: Global
• Data Type: numeric

---

Opened_table_definitions

• Description: Number of .frm files that have been cached.
• Scope: Global, Session
• Data Type: numeric

---

Opened_tables

• Description: Number of tables the server has opened.
• Scope: Global, Session
• Data Type: numeric

---

Opened_views

• Description: Number of views the server has opened.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Oqgraph_boost_version

• Description: OQGRAPH boost version.
• Scope: Global, Session
• Data Type: string
• Introduced: MariaDB 10.0.7 with the OQGRAPH storage engine.

---

Performance_schema_accounts_lost

• Description: Number of times a row could not be added to the performance schema accounts table due to it being full.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

---

Performance_schema_cond_classes_lost

• Description: Number of condition instruments that could not be loaded.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_cond_instances_lost

• Description: Number of instances a condition object could not be created.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_digest_lost

• Description:
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_file_classes_lost

• Description: Number of file instruments that could not be loaded.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_file_handles_lost

• Description: Number of instances a file object could not be opened.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_file_instances_lost

• Description: Number of instances a file object could not be created.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_hosts_lost

• Description: Number of times a row could not be added to the performance schema hosts table due to it being full.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

---

Performance_schema_locker_lost

• Description: Number of events not recorded, due to either being recursive, or having a deeper nested events stack than the implementation limit.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_mutex_classes_lost

• Description: Number of mutual exclusion instruments that could not be loaded.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_mutex_instances_lost

• Description: Number of instances a mutual exclusion object could not be created.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_rwlock_classes_lost

• Description: Number of read/write lock instruments that could not be loaded.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_rwlock_instances_lost

• Description: Number of instances a read/write lock object could not be created.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_socket_classes_lost

• Description:
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

---

Performance_schema_socket_instances_lost

• Description: Number of instances a socket object could not be created.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

---

Performance_schema_stage_classes_lost

• Description: Number of stage event instruments that could not be loaded.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

---

Performance_schema_statement_classes_lost

• Description: Number of statement instruments that could not be loaded.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

---

Performance_schema_table_handles_lost

• Description: Number of instances a table object could not be opened.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_table_instances_lost

• Description: Number of instances a table object could not be created.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_thread_classes_lost

• Description: Number of thread instruments that could not be loaded.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_thread_instances_lost

• Description: Number of instances thread object could not be created.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Performance_schema_users_lost

• Description: Number of times a row could not be added to the performance schema users table due to it being full.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Prepared_stmt_count

• Description: Current number of prepared statements.
• Scope: Global
• Data Type: numeric

---

Qcache_free_blocks

• Description: Number of free query cache memory blocks.
• Scope: Global
• Data Type: numeric

---

Qcache_free_memory

• Description: Amount of free query cache memory.
• Scope: Global
• Data Type: numeric

---

Qcache_hits

• Description: Number of requests served by the query cache.
• Scope: Global
• Data Type: numeric

---

Qcache_inserts

• Description: Number of queries ever cached in the query cache.
• Scope: Global
• Data Type: numeric

---

Qcache_lowmem_prunes

• Description: Number of pruning operations performed to remove old results to make space for new results in the query cache.
• Scope: Global
• Data Type: numeric

---

Qcache_not_cached

• Description: Number of queries that are uncacheable by the query cache, or use SQL_NO_CACHE.
• Scope: Global
• Data Type: numeric

---

Qcache_queries_in_cache

• Description: Number of queries currently cached by the query cache.
• Scope: Global
• Data Type: numeric

---

Qcache_total_blocks

• Description: Number of blocks used by the query cache.
• Scope: Global
• Data Type: numeric

---

Queries

• Description: Number of statements executed by the server, excluding COM_PING and COM_STATISTICS. Differs from Questions in that it also counts statements executed within stored programs.
• Scope: Global, Session
• Data Type: numeric

---

Questions

• Description: Number of statements executed by the server, excluding COM_PING, COM_STATISTICS, COM_STMT_PREPARE, COM_STMT_CLOSE, and COM_STMT_RESET statements. Differs from Queries in that it doesn't count statements executed within stored programs.
• Scope: Global, Session
• Data Type: numeric

---

Rows_read

• Description: Number of requests to read a row (excluding temporary tables).
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Rows_sent

• Description:
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Rows_tmp_read

• Description: Number of requests to read a row in a temporary table.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Select_full_join

• Description: Number of joins which did not use an index. If not zero, you may need to check table indexes.
• Scope: Global, Session
• Data Type: numeric

---

Select_full_range_join

• Description: Number of joins which used a range search of the first table.
• Scope: Global, Session
• Data Type: numeric

---

Select_range

• Description: Number of joins which used a range on the first table.
• Scope: Global, Session
• Data Type: numeric

---

Select_range_check

• Description: Number of joins without keys that check for key usage after each row. If not zero, you may need to check table indexes.
• Scope: Global, Session
• Data Type: numeric

---

Select_scan

• Description: Number of joins which used a full scan of the first table.
• Scope: Global, Session
• Data Type: numeric

---

Slow_launch_threads

• Description: Number of threads which took longer than slow_launch_time to create.
• Scope: Global, Session
• Data Type: numeric

---

Slow_queries

• Description: Number of queries which took longer than long_query_time to run. The slow query log does not need to be active for this to be recorded.
• Scope: Global, Session
• Data Type: numeric

---

Sort_merge_passes

• Description: Number of merge passes performed by the sort algorithm. If too high, you may need to look at improving your query indexes, or increasing the sort_buffer_size.
• Scope: Global, Session
• Data Type: numeric

---

Sort_priority_queue_sorts

• Description: The number of times that sorting was done through a priority queue. (The total number of times sorting was done is a sum Sort_range and Sort_scan). See filesort with small LIMIT optimization.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.13

---

Sort_range

• Description: Number of sorts which used a range.
• Scope: Global, Session
• Data Type: numeric

---

Sort_rows

• Description: Number of rows sorted.
• Scope: Global, Session
• Data Type: numeric

---

Sort_scan

• Description: Number of sorts which used a full table scan.
• Scope: Global, Session
• Data Type: numeric

---

Subquery_cache_hit

• Description: Counter for all subquery cache hits
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Subquery_cache_miss

• Description: Counter for all subquery cache misses
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.3

---

Syncs

• Description: Number of times my_sync() has been called, or the number of times the server has had to force data to disk. Covers the binary log, .frm creation (if these operations are configured to sync) and some storage engines (Archive, CSV, Aria), but not XtraDB/InnoDB).
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.1

---

Table_locks_immediate

• Description: Number of table locks which were completed immediately.
• Scope: Global
• Data Type: numeric

---

Table_locks_waited

• Description: Number of table locks which had to wait. Indicates table lock contention.
• Scope: Global
• Data Type: numeric

---

Tc_log_max_pages_used

• Description: Max number of pages used by the transaction coordinator recovery log.
• Scope: Global
• Data Type: numeric

---

Tc_log_page_size

• Description: Page size of the transaction coordinator recovery log.
• Scope: Global
• Data Type: numeric

---

Tc_log_page_waits

• Description: Number of times a two-phase commit was forced to wait for a free transaction coordinator recovery log page.
• Scope: Global
• Data Type: numeric

---

Threadpool_idle_threads

• Description: Number of inactive threads in the thread pool. Only meaningful on Unixes, not tracked on Windows. Threads become idle either by waiting for new work, or if it's blocked due to disk io, row or table lock etc.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Threadpool_threads

• Description: Number of threads in the thread pool.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 5.5

---

Threads_cached

• Description: Number of threads cached in the thread cache. Will be zero if the thread pool is in use (see Thread pool in MariaDB 5.5).
• Scope: Global
• Data Type: numeric

---

Threads_connected

• Description: Number of open connections.
• Scope: Global
• Data Type: numeric

---

Threads_created

• Description: Number of threads created to respond to client connections. If too large, look at increasing thread_cache_size.
• Scope: Global
• Data Type: numeric

---

Threads_running

• Description: Number of threads that are actively running, not sleeping.
• Scope: Global
• Data Type: numeric

---

Uptime

• Description: Number of seconds the server has been running.
• Scope: Global
• Data Type: numeric

---

Uptime_since_flush_status

• Description: Number of seconds since the last FLUSH STATUS.
• Scope: Global
• Data Type: numeric

---