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https://dev.mysql.com/doc/refman/5.7/en/sys-schema-views.html
The sys schema contains many views that summarize Performance Schema tables in various ways. Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema.html
mysql_upgrade returns an error if a sys schema exists but has no version view, on the assumption that absence of this view indicates a user-created sys schema. MySQL 5.7 includes the sys schema, a set of objects that helps DBAs and developers ...
https://dev.mysql.com/doc/refman/5.7/en/sys-session.html
These views are similar to processlist and x$processlist, but they filter out background processes to display only user sessions. For descriptions of the columns, see Section 26.4.3.22, “The processlist and x$processlist Views”.
https://dev.mysql.com/doc/refman/5.7/en/sys-statement-performance-analyzer.html
Configuration Options statement_performance_analyzer() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 26.4.2.1, “The sys_config Table”): debug, @sys.debug If this ...
https://dev.mysql.com/doc/refman/5.7/en/table-size-limit.html
Windows users, please note that FAT and VFAT (FAT32) are not considered suitable for production use with MySQL. The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/temporary-files.html
InnoDB non-compressed, user-created temporary tables and on-disk internal temporary tables are created in a temporary tablespace file named ibtmp1 in the MySQL data directory. On Unix, MySQL uses the value of the TMPDIR environment variable as the ...
https://dev.mysql.com/doc/refman/5.7/en/thread-pool-tuning.html
If the application has high requirements for the response time, it should most likely throttle users at a higher level itself. This section provides guidelines on setting thread pool system variables for best performance, measured using a metric ...
https://dev.mysql.com/doc/refman/5.7/en/timestamp-lookups.html
Temporal values are stored in TIMESTAMP columns as UTC values, and values inserted into and retrieved from TIMESTAMP columns are converted between the session time zone and UTC. (This is the same type of conversion performed by the CONVERT_TZ() ...
https://dev.mysql.com/doc/refman/5.7/en/transport-protocols.html
However, the named_pipe_full_access_group system variable is available to control which MySQL users are permitted to use named-pipe connections. For programs that use the MySQL client library (for example, mysql and mysqldump), MySQL supports ...
https://dev.mysql.com/doc/refman/5.7/en/trigger-syntax.html
In the example, the trigger body is a simple SET that accumulates into a user variable the values inserted into the amount column. To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section ...