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statistics/handle: refine the condition of dumping stats delta (#41133) #41171

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This is an automated cherry-pick of #41133

What problem does this PR solve?

Issue Number: ref #38189 ref #36004 ref #39785

Problem Summary:

What is changed and how it works?

Refine the condition of dumping stats delta:

  1. If the table doesn't exist or is a mem table or system table, then return false.
  2. If the mode is DumpAll, then return true.
  3. If the stats delta haven't been dumped in the past hour, then return true.
  4. If the table stats is pseudo or empty or Modify Count / Table Count exceeds the threshold.

There are two changes(marked in bold):

  1. a mem table or system table: It can prevent the cases such as Continuously update the stats_meta of mysql.tidb in auto analyze loop #39785.
  2. pseudo: When we fail to create stats meta after creating a table, ddl, statistics: fix stats meta missing when creating many tables at once #38301 uses the dump stats delta procedure to fill in missing stats meta. However, in that case, the table's stats is pseudo and the old condition would refuse to dump stats delta. So we need the change to fill in missing stats meta completely.

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No code

Side effects

  • Performance regression: Consumes more CPU
  • Performance regression: Consumes more Memory
  • Breaking backward compatibility

Documentation

  • Affects user behaviors
  • Contains syntax changes
  • Contains variable changes
  • Contains experimental features
  • Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

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@ti-chi-bot ti-chi-bot added release-note-none Denotes a PR that doesn't merit a release note. do-not-merge/cherry-pick-not-approved size/M Denotes a PR that changes 30-99 lines, ignoring generated files. type/cherry-pick-for-release-6.1 This PR is cherry-picked to release-6.1 from a source PR. labels Feb 7, 2023
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@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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@ti-chi-bot ti-chi-bot added size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. and removed size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Feb 7, 2023
@ti-chi-bot ti-chi-bot bot deleted a comment from ti-chi-bot Jul 10, 2023
@ti-chi-bot ti-chi-bot added the cherry-pick-approved Cherry pick PR approved by release team. label Feb 1, 2024
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ti-chi-bot bot commented Feb 6, 2024

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
idc-jenkins-ci-tidb/check_dev 075eea2 link true /test check-dev
idc-jenkins-ci-tidb/build 075eea2 link true /test build
idc-jenkins-ci-tidb/unit-test 075eea2 link true /test unit-test
idc-jenkins-ci-tidb/check_dev_2 075eea2 link true /test check-dev2
idc-jenkins-ci-tidb/mysql-test 075eea2 link true /test mysql-test

Full PR test history. Your PR dashboard.

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cherry-pick-approved Cherry pick PR approved by release team. release-note-none Denotes a PR that doesn't merit a release note. size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. type/cherry-pick-for-release-6.1 This PR is cherry-picked to release-6.1 from a source PR.
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