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query_cache_size = 1G -- This is really bad. Don't set it bigger than about 50M. It won't directly cause a crash, but it can cause lengthy stalls, which could lead to a crash. When any write occurs to a table, all entries in the QC for that table is purged. The bigger the QC the longer that takes. The QC is "in front of" the engines (MyISAM and InnoDB). ...

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