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Under a Specific work Load Index Cardinality Decreases to Zero (Doc ID 2921676.1)

Last updated on JANUARY 17, 2023

Applies to:

MySQL Database Service - Version N/A and later
MySQL Server - Version 5.7 to 8.0 [Release 5.7 to 8.0]
Information in this document applies to any platform.


Queries start to pile up on the processlist, taking much longer than usual.

Validating the cardinality of the Indexes in use , it was found to be Zero (or very low)


To check the indexes in use:


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