performance_timers

This page is part of MariaDB's Enterprise Documentation.

The parent of this page is: Performance Schema

Topics on this page:

Overview
DETAILS
- SCHEMA
CHANGE HISTORY
EXTERNAL REFERENCES

Overview

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

DETAILS

SCHEMA

CREATE TABLE `performance_timers` (
  `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.',
  `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.',
  `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.',
  `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.'
)

CHANGE HISTORY

Release Series	History
10.6 Enterprise	Present starting in MariaDB Enterprise Server 10.6.4-1. Schema changed in MariaDB Enterprise Server 10.6.5-2: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
10.6 Community	Present starting in MariaDB Community Server 10.6.0. Schema changed in MariaDB Community Server 10.6.5: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
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 `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
10.5 Community	Present starting in MariaDB Community Server 10.5.0. Schema changed in MariaDB Community Server 10.5.13: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
10.4 Enterprise	Present starting in MariaDB Enterprise Server 10.4.6-1. Schema changed in MariaDB Community Server 10.4.22-14: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
10.4 Community	Present starting in MariaDB Community Server 10.4.0. Schema changed in MariaDB Community Server 10.4.22: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
10.3 Enterprise	Present starting in MariaDB Enterprise Server 10.3.16-1. Schema changed in MariaDB Community Server 10.3.32-14: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
10.3 Community	Present starting in MariaDB Community Server 10.3.0. Schema changed in MariaDB Community Server 10.3.32: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
10.2 Enterprise	Present starting in MariaDB Enterprise Server 10.2.25-1. Schema changed in MariaDB Community Server 10.2.41-14: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )
10.2 Community	Present starting in MariaDB Community Server 10.2.0. Schema changed in MariaDB Community Server 10.2.41: ... CREATE TABLE `performance_timers` ( `TIMER_NAME` enum('CYCLE','NANOSECOND','MICROSECOND','MILLISECOND','TICK') NOT NULL COMMENT 'Time name, used in the setup_timers table.', `TIMER_FREQUENCY` bigint(20) DEFAULT NULL COMMENT 'Number of timer units per second. Dependent on the processor speed.', `TIMER_RESOLUTION` bigint(20) DEFAULT NULL COMMENT 'Number of timer units by which timed values increase each time.', `TIMER_OVERHEAD` bigint(20) DEFAULT NULL COMMENT 'Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.' )

EXTERNAL REFERENCES

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

Information specific to MariaDB SkySQL can be found on the performance_timers page in the SkySQL Documentation.