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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-hosts-table.html
For a description of how the Performance Schema maintains rows in this table, including the effect of TRUNCATE TABLE, see Section 25.12.8, “Performance Schema Connection Tables”. The hosts table contains a row for each host from which clients ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-metadata-locks-table.html
MySQL uses metadata locking to manage concurrent access to database objects and to ensure data consistency; see Section 8.11.4, “Metadata Locking”. Metadata locking applies not just to tables, but also to schemas, stored programs (procedures, ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-mutex-instances-table.html
The mutex_instances table lists all the mutexes seen by the Performance Schema while the server executes. A mutex is a synchronization mechanism used in the code to enforce that only one thread at a given time can have access to some common ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-objects-summary-global-by-type-table.html
The Performance Schema maintains the objects_summary_global_by_type table for aggregating object wait events. Example object wait event summary information: mysql> SELECT * FROM performance_schema.objects_summary_global_by_type\G ... row ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-performance-timers-table.html
The rows that do not contain NULL indicate which timers you can use in setup_timers. For an explanation of how event timing occurs, see Section 25.4.1, “Performance Schema Event Timing”. Note As of MySQL 5.7.21, the Performance Schema ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-prepared-statements-instances-table.html
The Performance Schema provides instrumentation for prepared statements, for which there are two protocols: The binary protocol. This is accessed through the MySQL C API and maps onto underlying server commands as shown in the following table. C ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-processlist-table.html
Note The processlist table is automatically created in the Performance Schema for new installations of MySQL 5.7.39, or higher. The MySQL process list indicates the operations currently being performed by the set of threads executing within the ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-applier-configuration-table.html
(CHANGE MASTER TO option: MASTER_DELAY) TRUNCATE TABLE is not permitted for the replication_applier_configuration table. This table shows the configuration parameters that affect transactions applied by the replica. Parameters stored in the table ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-applier-status-by-coordinator-table.html
For a multithreaded replica, the replica uses multiple worker threads and a coordinator thread to manage them, and this table shows the status of the coordinator thread. For a multithreaded replica, the replication_applier_status_by_worker table ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-applier-status-by-worker-table.html
If the replica is not multithreaded, this table shows the status of the applier thread. Otherwise, the replica uses multiple worker threads and a coordinator thread to manage them, and this table shows the status of the worker threads. For a ...