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https://dev.mysql.com/doc/refman/5.7/en/sys-schema-procedures.html
The following sections describe sys schema stored procedures. ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-progress-reporting.html
The following sys schema views provide progress reporting for long-running transactions: processlist session x$processlist x$session Assuming that the required instruments and consumers are enabled, the progress column of these views shows the ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-reference.html
The sys schema includes tables and triggers, views, and stored procedures and functions.
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-tables.html
The following sections describe sys schema tables and triggers. ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-atom-molecule-events.html
For a table I/O event, there are usually two rows in events_waits_current, not one. For example, a row fetch might result in rows like this: Row# EVENT_NAME TIMER_START TIMER_END ---- ---------- ----------- --------- 1 wait/io/file/myisam/dfile ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-miscellaneous-tables.html
The following sections describe tables that do not fall into the table categories discussed in the preceding sections: host_cache: Information from the internal host cache.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-queries.html
Pre-filtering limits which event information is collected and is independent of any particular user. By contrast, post-filtering is performed by individual users through the use of queries with appropriate WHERE clauses that restrict what event ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-descriptions.html
Tables in the performance_schema database can be grouped as follows: Setup tables. For example, to set the sizes of the wait event history tables, set performance_schema_events_waits_history_size and ...The events_waits_current table contains the ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-examples.html
(For descriptions of these tables, see Section 14.16.2, “InnoDB INFORMATION_SCHEMA Transaction and Locking Information”.) Suppose that three sessions are running concurrently. The following table shows some sample contents of the Information ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-memory-summary-tables.html
Example memory event summary information: mysql> SELECT * FROM performance_schema.memory_summary_global_by_event_name WHERE EVENT_NAME = 'memory/sql/TABLE'\G *************************** 1. Instruments named with the prefix memory/performance_schema/ ...Operation counts help to understand or tune the overall pressure the server is putting on the memory allocator, which has an impact on ...