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26.12.15 Performance Schema Thread Pool Tables
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The Performance Schema tables described here are available as
of MySQL 8.0.14. Prior to MySQL 8.0.14, use the corresponding
INFORMATION_SCHEMA tables instead; see
Section 25.40, “INFORMATION_SCHEMA Thread Pool Tables”.
The following sections describe the Performance Schema tables associated with the thread pool plugin (see Section 5.6.3, “MySQL Enterprise Thread Pool”). They provide information about thread pool operation:
tp_thread_group_state: Information about thread pool thread group statestp_thread_group_stats: Thread group statisticstp_thread_state: Information about thread pool thread states
Rows in these tables represent snapshots in time. In the case of
tp_thread_state, all rows for a
thread group comprise a snapshot in time. Thus, the MySQL server
holds the mutex of the thread group while producing the
snapshot. But it does not hold mutexes on all thread groups at
the same time, to prevent a statement against
tp_thread_state from blocking the
entire MySQL server.
The Performance Schema thread pool tables are implemented by the thread pool plugin and are loaded and unloaded when that plugin is loaded and unloaded (see Section 5.6.3.2, “Thread Pool Installation”). No special configuration step for the tables is needed. However, the tables depend on the thread pool plugin being enabled. If the thread pool plugin is loaded but disabled, the tables are not created.
Document created the 26/06/2006, last modified the 26/10/2018
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