MySQL 8.4 Release Notes
29.12.22.1 component_scheduler_tasks 表
The component_scheduler_tasks table contains a row for each scheduled task. Each row contains information about the ongoing progress of a task that applications, components, and plugins can implement, optionally, using the scheduler component (see Section 7.5.5, “Scheduler Component”). For example, the audit_log server plugin utilizes the scheduler component to run a regular, recurring flush of its memory cache:
mysql> select * from performance_schema.component_scheduler_tasks\G
*************************** 1. row ***************************
NAME: plugin_audit_log_flush_scheduler
STATUS: WAITING
COMMENT: Registered by the audit log plugin. Does a periodic refresh of the audit log
in-memory rules cache by calling audit_log_flush
INTERVAL_SECONDS: 100
TIMES_RUN: 5
TIMES_FAILED: 0
1 row in set (0.02 sec)The component_scheduler_tasks table has the following columns:
-
NAMEThe name supplied during the registration.
-
STATUSThe values are:
-
RUNNINGif the task is active and being executed. -
WAITINGif the task is idle and waiting for the background thread to pick it up or waiting for the next time it needs to be run to arrive.
-
-
COMMENTA compile-time comment provided by an application, component, or plugin. In the previous example, MySQL Enterprise Audit provides the comment using a server plugin named
audit_log. -
INTERVAL_SECONDSThe time in seconds to run a task, which an application, component, or plugin provides. MySQL Enterprise Audit enables you to specify this value using the
audit_log_flush_interval_secondssystem variable. -
TIMES_RUNA counter that increments by one every time the task runs successfully. It wraps around.
-
TIMES_FAILEDA counter that increments by one every time the execution of the task fails. It wraps around.