Index Usage Rules - Several Situations of Index Failure
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2023-07-23 03:36:52
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1. Concentration of index failure
1.1 The index fails when the operation is performed on the index column
1.2 Indexes of string type are invalid without quotation marks
1.3 The head fuzzy matching index fails
1.4 The condition of or connection, there is no index behind, and the front index is also invalid
1.5 Impact of data distribution
Origin blog.csdn.net/weixin_44860226/article/details/131819067