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https://dev.mysql.com/doc/refman/5.7/en/session-state-tracking.html
A client can enable these trackers to receive notification of changes to its session state. Uses for Session State Trackers Available Session State Trackers C API Session State Tracker Support Test Suite Session State Tracker Support Uses for ...
https://dev.mysql.com/doc/refman/5.7/en/show-status.html
Status variable information is also available from these sources: Performance Schema tables. Each invocation of the SHOW STATUS statement uses an internal temporary table and increments the global Created_tmp_tables value. mysql> SHOW STATUS; ...
https://dev.mysql.com/doc/refman/5.7/en/string-comparison-functions.html
Table 12.13 String Comparison Functions and Operators Name Description LIKE Simple pattern matching NOT LIKE Negation of simple pattern matching STRCMP() Compare two strings If a string function is given a binary string as an argument, the ...A ...
https://dev.mysql.com/doc/refman/5.7/en/subqueries.html
They provide alternative ways to perform operations that would otherwise require complex joins and unions. In MySQL, you cannot modify a table and select from the same table in a subquery. For information about how the optimizer handles subqueries, ...All subquery forms and operations that the SQL standard requires are supported, as well as a few features that are ...
https://dev.mysql.com/doc/refman/5.7/en/sys-diagnostics.html
Configuration Options diagnostics() 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 option is ON, produce ... Creates a report of the current server status for diagnostic ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-prerequisites.html
Because the sys schema provides an alternative means of accessing the Performance Schema, the Performance Schema must be enabled for the sys schema to work. Before using the sys schema, the prerequisites described in this section must be satisfied.
https://dev.mysql.com/doc/refman/5.7/en/test-pluggable-authentication.html
To verify plugin installation, examine the Information Schema PLUGINS table or use the SHOW PLUGINS statement (see Section 5.5.2, “Obtaining Server Plugin Information”). For example: $> mysql --user=testuser --password Enter password: ... MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/thread-pool-installation.html
For example, if you name only the plugin library file, the server loads all plugins that it contains (that is, the thread pool plugin and all the INFORMATION_SCHEMA tables). To verify plugin installation, examine the Information Schema PLUGINS table ... This section describes how to install MySQL Enterprise Thread ...
https://dev.mysql.com/doc/refman/5.7/en/unix-signal-response.html
SIGHUP causes the server to reload the grant tables and to flush tables, logs, the thread cache, and the host cache. On Unix and Unix-like systems, a process can be the recipient of signals sent to it by the root system account or the system ...
https://dev.mysql.com/doc/refman/5.7/en/windows-pluggable-authentication.html
Alternatively, to load the plugin at runtime, use this statement: INSTALL PLUGIN authentication_windows SONAME 'authentication_windows.dll'; INSTALL PLUGIN loads the plugin immediately, and also registers it in the mysql.plugins system table to ...