30.4.4.14 The ps_setup_save() Procedure

Saves the current Performance Schema configuration. This enables you to alter the configuration temporarily for debugging or other purposes, then restore it to the previous state by invoking the ps_setup_reload_saved() procedure.

To prevent other simultaneous calls to save the configuration, ps_setup_save() acquires an advisory lock named sys.ps_setup_save by calling the GET_LOCK() function. ps_setup_save() takes a timeout parameter to indicate how many seconds to wait if the lock already exists (which indicates that some other session has a saved configuration outstanding). If the timeout expires without obtaining the lock, ps_setup_save() fails.

It is intended you call ps_setup_reload_saved() later within the same session as ps_setup_save() because the configuration is saved in TEMPORARY tables. ps_setup_save() drops the temporary tables and releases the lock. If you end your session without invoking ps_setup_save(), the tables and lock disappear automatically.

This procedure disables binary logging during its execution by manipulating the session value of the sql_log_bin system variable. That is a restricted operation, so the procedure requires privileges sufficient to set restricted session variables. See Section 7.1.9.1, “System Variable Privileges”.

Parameters

• in_timeout INT: How many seconds to wait to obtain the sys.ps_setup_save lock. A negative timeout value means infinite timeout.

Example

mysql> CALL sys.ps_setup_save(10);

... make Performance Schema configuration changes ...

mysql> CALL sys.ps_setup_reload_saved();