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https://dev.mysql.com/doc/refman/5.7/en/sys-user-summary-by-statement-latency.html
The user_summary_by_statement_latency and x$user_summary_by_statement_latency views have these columns: user The client user name. Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background ...
https://dev.mysql.com/doc/refman/5.7/en/sys-user-summary-by-statement-type.html
The user_summary_by_statement_type and x$user_summary_by_statement_type views have these columns: user The client user name. Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads ... These views summarize informaion about statements executed, grouped by user and statement ...
https://dev.mysql.com/doc/refman/5.7/en/sys-user-summary.html
The user_summary and x$user_summary views have these columns: user The client user name. Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of ... These views summarize statement activity, file I/O, and connections, grouped by ...
https://dev.mysql.com/doc/refman/5.7/en/system-schema.html
If you do this, MySQL does not restart until you restore the old system tables from a backup or regenerate them by reinitializing the data directory (see Section 2.9.1, “Initializing the Data Directory”). Grant System Tables These system tables ...It contains tables that store information required by the MySQL server as it ...
https://dev.mysql.com/doc/refman/5.7/en/time.html
In particular, any fractional part in a value inserted into a TIME column is stored rather than discarded. MySQL retrieves and displays TIME values in 'hh:mm:ss' format (or 'hhh:mm:ss' format for large hours values). The hours part may be so large ...
https://dev.mysql.com/doc/refman/5.7/en/truncate-table.html
Foreign key constraints between columns of the same table are permitted. TRUNCATE TABLE can be used with Performance Schema summary tables, but the effect is to reset the summary columns to 0 or NULL, not to remove rows. Logically, TRUNCATE TABLE is ...
https://dev.mysql.com/doc/refman/5.7/en/user-resources.html
The max_questions, max_updates, and max_connections columns store the per-hour limits, and the max_user_connections column stores the MAX_USER_CONNECTIONS limit. One means of restricting client use of MySQL server resources is to set the global ...
https://dev.mysql.com/doc/refman/5.7/en/view-syntax.html
The CREATE VIEW statement creates a new view (see Section 13.1.21, “CREATE VIEW Statement”). To alter the definition of a view or drop a view, use ALTER VIEW (see Section 13.1.10, “ALTER VIEW Statement”), or DROP VIEW (see Section 13.1.32, ...
https://dev.mysql.com/doc/refman/5.7/en/windows-testing.html
In this case, start mysqld with the skip_name_resolve system variable enabled and use only localhost and IP addresses in the Host column of the MySQL grant tables. For more information about mysqlshow, see Section 4.5.7, “mysqlshow — Display ...
https://dev.mysql.com/doc/refman/5.7/en/working-with-null.html
A common error when working with NULL is to assume that it is not possible to insert a zero or an empty string into a column defined as NOT NULL, but this is not the case. The NULL value can be surprising until you get used to it. Conceptually, ...