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https://dev.mysql.com/doc/refman/9.7/en/performance-schema-variables-metadata-table.html
The variables_metadata table shows, for each server system variable, its name, scope, type, range of values (where applicable), and description. VARIABLE_SCOPE The variable's scope; this is one of the values listed here: GLOBAL The variable is ...
https://dev.mysql.com/doc/refman/9.7/en/regexp.html
This section discusses the functions and operators available for regular expression matching and illustrates, with examples, some of the special characters and constructs that can be used for regular expression operations. MySQL implements regular ...
https://dev.mysql.com/doc/refman/9.7/en/spatial-geojson-functions.html
This section describes functions for converting between GeoJSON documents and spatial values. Feature and FeatureCollection objects are not supported, except that geometry objects are extracted from them. MySQL also supports a native JSON data type ...
https://dev.mysql.com/doc/refman/9.7/en/srjsapi-routines.html
Two functions, listed here, provide JavaScript Function objects reflecting MySQL stored routines: getFunction(): Get a Function instance given the name of a stored function. getProcedure(): Get a Function instance given the name of a stored ...
https://dev.mysql.com/doc/refman/9.7/en/sys-ps-trace-statement-digest.html
Traces all Performance Schema instrumentation for a specific statement digest. If you find a statement of interest within the Performance Schema events_statements_summary_by_digest table, specify its DIGEST column MD5 value to this procedure and ...
https://dev.mysql.com/doc/refman/9.7/en/time.html
MySQL retrieves and displays TIME values in 'hh:mm:ss' format (or 'hhh:mm:ss' format for large hours values). The hours part may be so large because the TIME type can be used not only to represent a time of day (which must be less than 24 hours), ...
https://dev.mysql.com/doc/refman/9.7/en/trigger-syntax.html
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 15.1.27, “CREATE TRIGGER Statement”, and Section 15.1.41, “DROP TRIGGER Statement”. Here is a simple example that associates a ...
https://dev.mysql.com/doc/refman/9.7/en/vector-functions.html
MySQL 9.7 supports SQL functions to work with VECTOR values. It accepts the following arguments: A column of VECTOR data type. STRING_TO_VECTOR(string) Converts a string representation of a vector to a binary one. The expected format of the string ...
https://dev.mysql.com/doc/refman/9.7/en/window-function-optimization.html
Window functions affect the strategies the optimizer considers: Derived table merging for a subquery is disabled if the subquery has window functions. Semijoins are not applicable to window function optimization because semijoins apply to ...
https://dev.mysql.com/doc/refman/9.7/en/kerberos-pluggable-authentication.html
Note Kerberos pluggable authentication is an extension included in MySQL Enterprise Edition, a commercial product. MySQL Enterprise Edition supports an authentication method that enables users to authenticate to MySQL Server using Kerberos, ...