Le 7 févr. 2018 à 11:48, Reindl Harald <h.reindl@thelounge.net> a écrit : Am 07.02.2018 um 11:39 schrieb jocelyn fournier: Le 7 févr. 2018 à 11:34, Reindl Harald <h.reindl@thelounge.net> a écrit : Am 07.02.2018 um 11:28 schrieb Sergey Vojtovich: I'm afraid query cache doesn't scale well. Try turning it off well, the question is why on a read-bound workload because there is no valid reason that it locks reads for other threads and no remove query-cache like MySQL 8.0 is no solution because when you have a few terrible optimized queries on your server which takes seconds to run query-cache will save your ass while you can (and we did) write known fast queries with "select SQL_NO_CACHE" to get the locking relaxed You could also take a look at software like https://www.heimdalldata.com which tries to replace the query cache (and much more BTW) it's not very helpful to throw more and more layers and software on problems trying to hide instead solve them well if there's no query cache at all like in MySQL 8, it could be definitely useful :) And it add a few other useful features like read/write split (for those who have not implemented it directly in their application yet), automated failover, etc... And with its dashboard you know what it's doing (and as a bonus what's potentially wrong with your queries as well). each layer brings inevitable it's own problems to the mix and if it's only added latency for non-cacheable queries and complexer dependencies for long-term maintainance of oyur whole application stack I agree before adopting this kind of software, you have to check the cacheability of your application (which is a metric displayed by the heimdalldata dashboard BTW) because there's always a small overhead. But I like the concept of heimdalldata where the cache is actually hosted on each front server, instead of a potentially remote MySQL server, hence *reducing* the latency of your application by removing the network round-trip delay for cached queries. -- Jocelyn Fournier Founder M : +33 6 51 21 54 10 <+33%206%2051%2021%2054%2010> https://www.softizy.com Softizy - At your side to Optimize your PHP / MySQL applications