When MySQL needs to sort its output rows, and cannot do this via indexes, it uses a quicksort function called filesort(). This does not necessarily mean it will touch the disk at any time.
I'm working on a event tracking system which uses a handful of lookup tables as well as the primary logging …
mysql optimization select temporary filesortI have a simple mysql query, but when I have a lot of records (currently 103,0000), the performance is really slow …
mysql performance database-performance filesortOn a simple but very large Innodb table, I have a unique index on column A and I want to …
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mysql explain filesortI need your help to optimize the query to avoid using "Using filesort".The job of the query is to …
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