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https://dev.mysql.com/doc/refman/8.0/en/select-benchmarking.html
BENCHMARK() is an excellent tool for finding out if some function is a problem for your queries. To measure the speed of a specific MySQL expression or function, invoke the BENCHMARK() function using the mysql client program. The return value is ...
https://dev.mysql.com/doc/refman/8.0/en/server-shutdown.html
The server shutdown process takes place as follows: The shutdown process is initiated. For example, a user with the SHUTDOWN privilege can execute a mysqladmin shutdown command. Other operating system-specific shutdown initiation methods are ...
https://dev.mysql.com/doc/refman/8.0/en/server-status-variable-reference.html
The following table lists all status variables applicable within mysqld. The last column indicates whether the scope for each variable is Global, Session, or both. Please see the corresponding item descriptions for details on setting and using the ...
https://dev.mysql.com/doc/refman/8.0/en/set-transaction.html
transaction_characteristic: { ISOLATION LEVEL level | access_mode } level: { REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED | SERIALIZABLE } access_mode: { READ WRITE | READ ONLY } This statement specifies transaction characteristics. It takes ...
https://dev.mysql.com/doc/refman/8.0/en/set-variable.html
variable: { user_var_name | param_name | local_var_name | {GLOBAL | @@GLOBAL.} system_var_name | {PERSIST | @@PERSIST.} system_var_name | {PERSIST_ONLY | @@PERSIST_ONLY.} system_var_name | [SESSION | @@SESSION. | @@] system_var_name } SET syntax for ...
https://dev.mysql.com/doc/refman/8.0/en/show-processlist.html
SHOW [FULL] PROCESSLIST Important The INFORMATION SCHEMA implementation of SHOW PROCESSLIST is deprecated and subject to removal in a future MySQL release. It is recommended to use the Performance Schema implementation of SHOW PROCESSLIST instead.
https://dev.mysql.com/doc/refman/8.0/en/show-profiles.html
SHOW PROFILES The SHOW PROFILES statement, together with SHOW PROFILE, displays profiling information that indicates resource usage for statements executed during the course of the current session. Note The SHOW PROFILE and SHOW PROFILES statements ...
https://dev.mysql.com/doc/refman/8.0/en/silent-column-changes.html
In some cases, MySQL silently changes column specifications from those given in a CREATE TABLE or ALTER TABLE statement. These might be changes to a data type, to attributes associated with a data type, or to an index specification. All changes are ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-aggregate-functions.html
MySQL supports aggregate functions that perform a calculation on a set of values. For general information about these functions, see Section 14.19.1, “Aggregate Function Descriptions”. ST_Collect() can be used as a window function, as signified ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-relation-functions-object-shapes.html
The OpenGIS specification defines the following functions to test the relationship between two geometry values g1 and g2, using precise object shapes. The return values 1 and 0 indicate true and false, respectively, except that distance functions ...