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2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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When performing sql optimization, the first check is very slow, and the second check is very fast because it is checked in the flush cache.
So you can't see whether it's the effect of optimization or the effect of caching queries.
Therefore, it is best to close the cache to execute sql when optimizing
command is as follows
Select SQL_NO_CACHE * from tbl_picture4
If you need to turn off caching
modify parameter query_cache_type
query_cache_type=0
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