mysql joint index optimization (lock table)

Others 2020-01-14 10:35:10 views: null

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Through case, we can find 77w data, check 100, time 57s

Encounter this problem, create a joint index on the line

Note that, the principle of joint index is left, after filtration through c if three conditions A B C where, with no A and B, C will not go column index

V fine, thin clouds

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Origin blog.csdn.net/qq_16855077/article/details/103063030

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