update doc for SPM #6790

Reminiscent · 2021-08-02T09:30:59Z

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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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ti-chi-bot · 2021-08-02T09:31:00Z

[REVIEW NOTIFICATION]

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Reminiscent · 2021-08-02T09:32:32Z

/cc @eurekaka

sql-plan-management.md

TomShawn · 2021-08-05T02:23:42Z

/rebase

sql-plan-management.md

…/docs-cn into banBaselineEvolution

sql-plan-management.md

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

sql-plan-management.md

eurekaka · 2021-08-09T06:43:12Z

sql-plan-management.md

+    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

sql-plan-management.md

+
+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?

sql-plan-management.md

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

sql-plan-management.md

TomShawn

LGTM

TomShawn · 2021-08-11T05:41:03Z

/remove-status LGT1
/status LGT2

sql-plan-management.md

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.

Commit hash: 883d037

spm: ban baseline evolution feature

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spm: ban baseline evolution feature

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fix typo

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update doc for SPM pingcap/docs#6146

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

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update doc for SPM #6790

update doc for SPM #6790

Reminiscent commented Aug 2, 2021 •

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ti-chi-bot commented Aug 2, 2021 •

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Reminiscent commented Aug 2, 2021

TomShawn commented Aug 5, 2021

eurekaka Aug 9, 2021

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TomShawn commented Aug 11, 2021

TomShawn commented Aug 11, 2021

ti-chi-bot commented Aug 11, 2021


		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。

update doc for SPM #6790

update doc for SPM #6790

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Reminiscent commented Aug 2, 2021 • edited Loading

First-time contributors' checklist

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Do your changes match any of the following descriptions?

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Reminiscent commented Aug 2, 2021 •

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