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The problem was solved with deleting packet nginx-extras


It's the idea of mysqltuner to recommend actions for better performance. The optimize table will care about fragmentation. Optimize on big tables takes some time though, while the table you are optimizing is locked. Generally the warning notes prefixed with [!!] are commented in the General recommendations section. Before you tune the default parameters of ...


Performance tuning is as much a black art as it is a science. Complete books have been written about it, include quite a bit as part of the vendor documentation You start with good monitoring, add load, get a baseline and only then you start adjusting and observing if your adjustment did or did not have the intended result. Rinse and repeat until you get ...

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