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Query statistics lock is consuming excessive CPU resources during the auto-analysis check #49472

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hi-rustin opened this issue Dec 14, 2023 · 2 comments · Fixed by #49473
Closed

Query statistics lock is consuming excessive CPU resources during the auto-analysis check #49472

hi-rustin opened this issue Dec 14, 2023 · 2 comments · Fixed by #49473
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affects-7.5 found/customer Customers have encountered this bug. severity/moderate sig/planner SIG: Planner type/bug This issue is a bug.

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@hi-rustin
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Enhancement

If you have a large number of tables, the auto-analyze worker can help you analyze them efficiently by checking if they need to be analyzed. However, during the analysis, we need to obtain the stats lock information. If a table is already locked, then there is no need to analyze it.
If your table is small, it needs to be checked frequently which can lead to excessive CPU resource consumption due to the querying of statistics lock.

img_v3_0062_98257775-ab90-4ea8-bbf9-64252d65b53g
@hi-rustin hi-rustin mentioned this issue Dec 14, 2023
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ti-chi-bot bot pushed a commit that referenced this issue Dec 18, 2023
@hi-rustin
statistics: only query locks once (#49473)
23953a7 
close #49472
@ti-chi-bot ti-chi-bot mentioned this issue Dec 18, 2023
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ti-chi-bot bot pushed a commit that referenced this issue Jan 25, 2024
@ti-chi-bot
statistics: only query locks once (#49473) (#49554)
e90e302 
close #49472
@seiya-annie
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/found customer

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@seiya-annie
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/found customer

@ti-chi-bot ti-chi-bot bot added the found/customer Customers have encountered this bug. label Jun 4, 2024
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statistics: only query locks once hi-rustin/tidb
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