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https://dev.mysql.com/doc/refman/5.7/en/sys-schema-table-statistics.html
By default, rows are sorted by descending total wait time (tables with most contention first). The schema_table_statistics and x$schema_table_statistics views have these columns: table_schema The schema that contains the table. total_latency The ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-views.html
The sys schema contains many views that summarize Performance Schema tables in various ways. Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix ...
https://dev.mysql.com/doc/refman/5.7/en/sys-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/thread-pool-tuning.html
Stalled statements generate a lot of extra overhead since they involve extra context switches and in some cases even extra thread creations. If the application has high requirements for the response time, it should most likely throttle users at a ...
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/tuning-trace-purging.html
A user who wants to see the trace of a different substatement can enable or disable tracing for the desired substatement, but this requires editing the routine code, which may not always be possible. Thus, if a statement contains substatements (such ...
https://dev.mysql.com/doc/refman/5.7/en/using-date.html
This makes MySQL very convenient for Web applications where you obtain year, month, and day in three different fields and you want to store exactly what the user inserted (without date validation). You should use this format in UPDATE expressions ...
https://dev.mysql.com/doc/refman/5.7/en/what-is-mysql.html
MySQL Server has a practical set of features developed in close cooperation with our users. MySQL, the most popular Open Source SQL database management system, is developed, distributed, and supported by Oracle Corporation. The MySQL website ...
https://dev.mysql.com/doc/refman/5.7/en/windows-select-server.html
It is necessary to enable this variable explicitly because some users have experienced problems with shutting down the MySQL server when named pipes were used. The following table shows the available servers for Windows in MySQL 5.7. Binary ...
https://dev.mysql.com/doc/refman/5.7/en/cost-model.html
The primary key for the server_cost table is the cost_name column, so it is not possible to create multiple entries for any cost estimate. The server recognizes these cost_name values for the server_cost table: disk_temptable_create_cost (default ...