update doc for SPM by Reminiscent · Pull Request #6790 · pingcap/docs-cn

Reminiscent · 2021-08-02T09:30:59Z

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What is changed, added or deleted? (Required)

In version5.2, we try to ban the feature for baseline evolution. So we need to forbid to open the switch.

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TiDB pull#26333
TiDB pull#26403
TiDB pull#26340
TiDB pull#26139

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Delete files
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ti-chi-bot · 2021-08-02T09:31:00Z

[REVIEW NOTIFICATION]

This pull request has been approved by:

TomShawn

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Reminiscent · 2021-08-02T09:32:32Z

/cc @eurekaka

TomShawn · 2021-08-05T02:23:42Z

/rebase

…/docs-cn into banBaselineEvolution

Co-authored-by: Kenan Yao <cauchy1992@gmail.com>

eurekaka · 2021-08-09T06:43:12Z

+    select * from t;
+
+-- 使用 explain 语句查看 SQL 的执行计划，通过查看 warning 信息确认查询所使用的 Binding
+explain select * from t;


explain verbose?

eurekaka · 2021-08-09T06:43:24Z

+
+该语句使用系统变量 [last_plan_from_binding](https://docs.pingcap.com/zh/tidb/stable/system-variables#last_plan_from_binding-%E4%BB%8E-v40-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5) 显示上一条执行的语句所使用的执行计划是否来自 binding 的执行计划。
+
+另外，当我们使用 explain 语句查看 SQL 的查询计划时，如果该 SQL 使用了 Binding，explain 语句会产生 warning，我们可以通过查看 warning 了解 SQL 使用了哪一条 Binding。


explain verbose?

Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>

TomShawn

LGTM

TomShawn · 2021-08-11T05:41:03Z

/remove-status LGT1
/status LGT2

TomShawn · 2021-08-11T05:42:23Z

/merge

ti-chi-bot · 2021-08-11T05:42:25Z

This pull request has been accepted and is ready to merge.

Details

Commit hash: 883d037

spm: ban baseline evolution feature

02ab920

ti-chi-bot requested a review from TomShawn August 2, 2021 09:31

ti-chi-bot added missing-translation-status This PR does not have translation status info. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels Aug 2, 2021

ti-chi-bot requested a review from eurekaka August 2, 2021 09:32

TomShawn added translation/doing This PR’s assignee is translating this PR. v5.2 This PR/issue applies to TiDB v5.2. and removed missing-translation-status This PR does not have translation status info. labels Aug 2, 2021

TomShawn assigned Liuxiaozhen12 Aug 2, 2021

Update sql-plan-management.md

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ti-chi-bot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels Aug 4, 2021

Reminiscent commented Aug 4, 2021

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Reminiscent added 3 commits August 5, 2021 02:25

spm: ban baseline evolution feature

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Update sql-plan-management.md

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github-actions Bot force-pushed the banBaselineEvolution branch from ec5e457 to 7e42816 Compare August 5, 2021 02:25

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Reminiscent added 2 commits August 5, 2021 18:00

Update sql-plan-management.md

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Merge branch 'banBaselineEvolution' of https://github.com/Reminiscent…

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…/docs-cn into banBaselineEvolution

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Update sql-plan-management.md

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Co-authored-by: Kenan Yao <cauchy1992@gmail.com>

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Reminiscent and others added 7 commits August 11, 2021 12:50

Update sql-plan-management.md

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Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>

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minor fix

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Update sql-plan-management.md

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fix typo

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ti-chi-bot merged commit 25b785e into pingcap:master Aug 11, 2021

Liuxiaozhen12 mentioned this pull request Aug 11, 2021

update doc for SPM pingcap/docs#6146

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Liuxiaozhen12 added translation/done This PR has been translated from English into Chinese and updated to pingcap/docs-cn in a PR. and removed translation/doing This PR’s assignee is translating this PR. labels Aug 11, 2021

Reminiscent mentioned this pull request Aug 13, 2021

upgrade will fail when tidb system variable tidb_evolve_plan_baselines =on pingcap/tidb#27185

Closed


		该语句使用系统变量 [last_plan_from_binding](https://docs.pingcap.com/zh/tidb/stable/system-variables#last_plan_from_binding-%E4%BB%8E-v40-%E7%89%88%E6%9C%AC%E5%BC%80%E5%A7%8B%E5%BC%95%E5%85%A5) 显示上一条执行的语句所使用的执行计划是否来自 binding 的执行计划。

		另外，当我们使用 explain 语句查看 SQL 的查询计划时，如果该 SQL 使用了 Binding，explain 语句会产生 warning，我们可以通过查看 warning 了解 SQL 使用了哪一条 Binding。

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