v7.5.7: change the default value of tidb_enable_historical_stats #21551
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Summary of Changes
Hello @Oreoxmt, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
I've updated the documentation for TiDB version 7.5.7 to reflect a significant change in the default behavior of the tidb_enable_historical_stats system variable. Previously, this variable defaulted to ON, enabling historical statistics by default. With this change, the default value is now OFF, meaning historical statistics will be disabled by default. This adjustment impacts how historical statistics are managed out-of-the-box for users of TiDB 7.5.7 and later.
Highlights
tidb_enable_historical_statsDefault Value Change: The default value for thetidb_enable_historical_statssystem variable has been changed fromONtoOFFspecifically for TiDB version 7.5.7. This means that historical statistics will now be disabled by default in this version.- Documentation Update: The
system-variables.mddocumentation file has been updated to reflect this change, providing clear information about the new default value and its implications for users.
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Code Review
This pull request updates the documentation for the tidb_enable_historical_stats system variable to reflect its new default value of OFF starting from v7.5.7. The change is accurate and improves clarity. I have provided one suggestion to further enhance consistency and conciseness, in line with the documentation style guide.
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/cc @winoros @hawkingrei |
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