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MySQL performance: caching and long queries
Hello, I have very simple query that runs first time over 2 minutes and second time - 3.65 seconds. Query joins 3 tables, 2 million, 300,000 and 1,000 rows. The size of the whole database (20 tables) on disk - 200Mb. If server has no activity for 24 hours and then come with the same query -...
