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https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-show-enabled.html
Displays all currently enabled Performance Schema configuration. Parameters in_show_instruments BOOLEAN: Whether to display enabled instruments. This might be a long list. in_show_threads BOOLEAN: Whether to display enabled threads. Example mysql> ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-thread-id.html
This is a value of the type given in the PROCESSLIST_ID column of the Performance Schema threads table or the Id column of SHOW PROCESSLIST output. Returns the Performance Schema thread ID assigned to a given connection ID, or the thread ID for the ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-usage.html
To generate a dump file, name the sys schema explicitly on the command line using either of these commands: mysqldump --databases --routines sys > sys_dump.sql mysqlpump sys > sys_dump.sql To reinstall the schema from the dump file, use this ...Most ...
https://dev.mysql.com/doc/refman/5.7/en/sys-session-ssl-status.html
For each connection, this view displays the SSL version, cipher, and count of reused SSL sessions. The session_ssl_status view has these columns: thread_id The thread ID for the connection.
https://dev.mysql.com/doc/refman/5.7/en/sys-sys-get-config.html
However, this should not be done inside a loop (for example, for each row in a result set) because for repeated calls where the assignment is needed only in the first iteration, using IFNULL(...) is expected to be significantly slower than using an ... Given a configuration option name, returns the option value from the sys_config table, or the provided default value (which may be NULL) if the option does not exist in the ...
https://dev.mysql.com/doc/refman/5.7/en/sys-table-exists.html
This is an OUT parameter, so it must be a variable into which the table type can be stored. Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, ...
https://dev.mysql.com/doc/refman/5.7/en/sys-version-major.html
This function returns the major version of the MySQL server. Example mysql> SELECT VERSION(), sys.version_major(); +------------------+---------------------+ | VERSION() | sys.version_major() | +------------------+---------------------+ | ...
https://dev.mysql.com/doc/refman/5.7/en/sys-version-minor.html
This function returns the minor version of the MySQL server. Example mysql> SELECT VERSION(), sys.version_minor(); +------------------+---------------------+ | VERSION() | sys.version_minor() | +------------------+---------------------+ | ...
https://dev.mysql.com/doc/refman/5.7/en/sys-version-patch.html
This function returns the patch release version of the MySQL server. Example mysql> SELECT VERSION(), sys.version_patch(); +------------------+---------------------+ | VERSION() | sys.version_patch() | +------------------+---------------------+ | ...
https://dev.mysql.com/doc/refman/5.7/en/temporary-table-problems.html
Temporary tables created with CREATE TEMPORARY TABLE have the following limitations: TEMPORARY tables are supported only by the InnoDB, MEMORY, MyISAM, and MERGE storage engines. Use ALTER TABLE instead: ALTER TABLE old_name RENAME new_name; You ...