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27.4.4.14 The ps_setup_save() Procedure

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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 5.1.9.1, “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.

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Example
  1. mysql> CALL sys.ps_setup_save(10);
  2.  
  3. ... make Performance Schema configuration changes ...
  4.  
  5. mysql> CALL sys.ps_setup_reload_saved();

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Document created the 26/06/2006, last modified the 26/10/2018
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References

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