Hi Federico. It is documented, in the threadpool document https://mariadb.com/kb/en/mariadb/documentation/optimization-and-tuning/buff... It says following, towards the end of the doc, in “Notes” The thread_cache_size system variable is not used when the thread pool is used and the Threads_cached status variable will have a value of 0. From: Federico Razzoli Sent: Tuesday, December 2, 2014 5:56 PM To: Maria Discuss Hi all Would someone kindly explain (or document) how @@thread_cache_size affects the pool-of-threads? Do values > 0 make sense? Regards Federico _______________________________________________ Mailing list: https://launchpad.net/~maria-discuss Post to : maria-discuss@lists.launchpad.net Unsubscribe : https://launchpad.net/~maria-discuss More help : https://help.launchpad.net/ListHelp