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https://dev.mysql.com/doc/refman/9.7/en/performance-schema-error-log-table.html
Of the logs the MySQL server maintains, one is the error log to which it writes diagnostic messages (see Section 7.4.2, “The Error Log”). Typically, the server writes diagnostics to a file on the server host or to a system log service.
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-instance-tables.html
They provide event names and explanatory notes or status information: cond_instances: Condition synchronization object instances file_instances: File instances mutex_instances: Mutex synchronization object instances rwlock_instances: Lock ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-memory-summary-tables.html
Operation counts help to understand or tune the overall pressure the server is putting on the memory allocator, which has an impact on performance. Allocating a single byte one million times is not the same as allocating one million bytes a single ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-miscellaneous-tables.html
The following sections describe tables that do not fall into the table categories discussed in the preceding sections: component_scheduler_tasks: The current status of each scheduled task. connection_control_failed_login_attempts: The current ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-replication-group-members-table.html
This table shows network and status information for replication group members. The network addresses shown are the addresses used to connect clients to the group, and should not be confused with the member's internal group communication address ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-setup-meters-table.html
This column can be modified DESCRIPTION: A string describing the meter.
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-socket-summary-tables.html
These socket summary tables aggregate timer and byte count information for socket operations: socket_summary_by_event_name: Aggregate timer and byte count statistics generated by the wait/io/socket/* instruments for all socket I/O operations, per ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-tp-thread-group-stats-table.html
The tp_thread_group_stats table has these columns: TP_GROUP_ID The thread group ID. This number is incremented when a statement starts executing, not when it finishes. QUERIES_QUEUED The number of statements received that were queued for execution.
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-variables-info-table.html
The variables_info table shows, for each system variable, the source from which it was most recently set, and its range of values. VARIABLE_SOURCE The source from which the variable was most recently set: COMMAND_LINE The variable was set on the ...
https://dev.mysql.com/doc/refman/9.7/en/point-in-time-recovery-binlog.html
This section explains the general idea of using the binary log to perform a point-in-time-recovery. The next section, Section 9.5.2, “Point-in-Time Recovery Using Event Positions”, explains the operation in details with an example. Note Many of ...