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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-waits-history-long-table.html
The events_waits_history_long table contains N the most recent wait events that have ended globally, across all threads. Wait events are not added to the table until they have ended. When the table becomes full, the oldest row is discarded when a ...
https://dev.mysql.com/doc/refman/5.7/en/replication-multi-source-adding-gtid-master.html
These steps assume you have enabled GTIDs for transactions on the replication source servers using gtid_mode=ON, created a replication user, ensured that the replica is using TABLE based replication metadata repositories, and provisioned the ...
https://dev.mysql.com/doc/refman/5.7/en/retrieving-data.html
The SELECT statement is used to pull information from a table. The general form of the statement is: SELECT what_to_select FROM which_table WHERE conditions_to_satisfy; what_to_select indicates what you want to see. This can be a list of columns, ...
https://dev.mysql.com/doc/refman/5.7/en/security-options.html
The following table shows mysqld options and system variables that affect security. For descriptions of each of these, see Section 5.1.6, “Server Command Options”, and Section 5.1.7, “Server System Variables”.
https://dev.mysql.com/doc/refman/5.7/en/string-types.html
The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and SET. For information about storage requirements of the string data types, see Section 11.7, “Data Type Storage Requirements”. For descriptions of functions that ...
https://dev.mysql.com/doc/refman/5.7/en/sys-format-bytes.html
Given a byte count, converts it to human-readable format and returns a string consisting of a value and a units indicator. Depending on the size of the value, the units part is bytes, KiB (kibibytes), MiB (mebibytes), GiB (gibibytes), TiB ...
https://dev.mysql.com/doc/refman/5.7/en/sys-list-drop.html
Removes a value from a comma-separated list of values and returns the result. For more information, see the description of list_add() Parameters in_list TEXT: The list to be modified.
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-check-lost-instrumentation.html
This view returns information about lost Performance Schema instruments, to indicate whether the Performance Schema is unable to monitor all runtime data. The ps_check_lost_instrumentation view has these columns: variable_name The Performance ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-is-account-enabled.html
Returns YES or NO to indicate whether Performance Schema instrumentation for a given account is enabled. Parameters in_host VARCHAR(60): The host name of the account to check. Example mysql> SELECT sys.ps_is_account_enabled('localhost', 'root'); ...
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 ...