reference: refine sql diagnosis by reafans · Pull Request #2756 · pingcap/docs-cn

reafans · 2020-04-15T06:14:15Z

What is changed, added or deleted? (Required)

Fix some changed place in SQL diagnosis-related system table documents.

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If you select two or more versions from above, to trigger the bot to cherry-pick this PR to your desired release version branch(es), you must add corresponding labels such as needs-cherry-pick-4.0, needs-cherry-pick-3.1, needs-cherry-pick-3.0, and needs-cherry-pick-2.1.

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This PR is translated from:
Other reference link(s): reference/system-databases: add 12 new documents for sql diagnosis #2522

…ne_sql_diagnosis

TomShawn

LGTM
@lonng @crazycs520 PTAL

TomShawn · 2020-04-21T11:14:15Z

Please update this PR according this comment.

…ne_sql_diagnosis

…s-cn into refine_sql_diagnosis

crazycs520 · 2020-04-23T07:50:55Z

-| tidb | 127.0.0.1:10080 | cpu         | cpu         | cpu-logical-cores  | 8     |
-| tidb | 127.0.0.1:10080 | cpu         | cpu         | cpu-physical-cores | 4     |
-| pd   | 127.0.0.1:2379  | cpu         | cpu         | cpu-logical-cores  | 8     |
+| tidb | 0.0.0.0:4000    | cpu         | cpu         | cpu-logical-cores  | 4     |


Both cpu-logical-cores and cpu-physical-cores is 4?

I run it in the Virtual Machine of the Virtual Box，so it shows that both of them are same. To avoid misunderstand, i changed it back to 8.

Co-Authored-By: crazycs <crazycs520@gmail.com>

Co-Authored-By: TomShawn <41534398+TomShawn@users.noreply.github.com>

TomShawn · 2020-04-26T08:59:02Z

@@ -289,7 +293,7 @@ DETAILS   | the cluster has 2 different tidb versions, execute the sql to see mo
 | TiKV | region-count | pd_scheduler_store_status  | 小于 20000 | 检测各个 TiKV 节点的 Region 数量，期望单个节点的 Region 数量小于 20000 |


@reafans 请再确认 SQL 诊断相关系统表文档中的 节点 是否应该替换成 实例。

TomShawn · 2020-04-26T08:59:45Z

-* `QUANTILE`：百分位。对于直方图类型的监控数据，指定一个默认百分位。如果值为 `0`，表示该监控表对应的监控不是直方图。`tidb_query_duration` 默认查询 0.9 ，也就是 P90 的监控值。
-* `COMMENT`：对这个监控表的解释。可以看出 `tidb_query_duration` 表的是用来查询 TiDB query 执行的百分位时间，如 P999/P99/P90 的查询耗时，单位是秒。
+* `QUANTILE`：百分位。直方图类型的监控数据会指定一个默认百分位。如果值为 `0`，表示该监控表对应的监控不是直方图。`tidb_query_duration` 默认查询 0.9 ，也就是 P90 的监控值。
+* `COMMENT`：对这个监控表的解释。可以看出 `tidb_query_duration` 表是用来查询 TiDB query 执行的百分位时间的，如 P999/P99/P90 的查询耗时，单位是秒。


Suggested change

* `COMMENT`：对这个监控表的解释。可以看出 `tidb_query_duration` 表是用来查询 TiDB query 执行的百分位时间的，如 P999/P99/P90 的查询耗时，单位是秒。

* `COMMENT`：对这个监控表的解释。可以看出 `tidb_query_duration` 表是用来查询 TiDB query 执行的百分位时间，如 P999/P99/P90 的查询耗时，单位是秒。

TomShawn · 2020-04-26T09:00:28Z

+* 集群日志表 [`information_schema.cluster_log`](/reference/system-databases/cluster-log.md) 用于集群日志查询，通过将查询条件下推到各个实例，降低日志查询对集群的影响，性能影响小于等 grep 命令。

-TiDB 4.0 之前的系统表，只能查看当前节点，TiDB 4.0 实现了对应的集群表，可以在单个 TiDB 节点上拥有整个集群的全局视图。这些表目前都位于 [`information_schema`](/reference/system-databases/information-schema.md) 中，查询方式与其他 `information_schema` 系统表一致。
+TiDB 4.0 之前的系统表，只能查看当前节点信息，TiDB 4.0 实现了对应的集群表，可以在单个 TiDB 实例上拥有整个集群的全局视图。这些表目前都位于 [`information_schema`](/reference/system-databases/information-schema.md) 中，查询方式与其他 `information_schema` 系统表一致。


是节点还是实例呢？

TomShawn · 2020-04-26T09:02:33Z

-* 集群拓扑表 [`information_schema.cluster_info`](/reference/system-databases/cluster-info.md) 用于获取集群当前的拓扑信息，以及各个节点的版本、版本对应的 Git Hash、各节点的启动时间、各节点的运行时间。
-* 集群配置表 [`information_schema.cluster_config`](/reference/system-databases/cluster-config.md) 用于获取集群当前所有节点的配置。对于 TiDB 4.0 之前的版本，用户必须逐个访问各个节点的 HTTP API 才能获取这些配置信息。
+* 集群拓扑表 [`information_schema.cluster_info`](/reference/system-databases/cluster-info.md) 用于获取集群当前的拓扑信息，以及各个实例的版本、版本对应的 Git Hash、各实例的启动时间、各实例的运行时间。
+* 集群配置表 [`information_schema.cluster_config`](/reference/system-databases/cluster-config.md) 用于获取集群当前所有实例的配置。对于 TiDB 4.0 之前的版本，用户必须逐个访问各个节点中实例的 HTTP API 才能获取这些配置信息。


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TomShawn

LGTM
@crazycs520 PTAL again

crazycs520

LGTM

* refine sql diagnosis * refine * refine * refine doc * refine * refine * Update reference/system-databases/inspection-result.md Co-Authored-By: crazycs <crazycs520@gmail.com> * Update reference/system-databases/metrics-schema.md Co-Authored-By: crazycs <crazycs520@gmail.com> * Update reference/system-databases/inspection-summary.md Co-Authored-By: TomShawn <41534398+TomShawn@users.noreply.github.com> * address comment Co-authored-by: crazycs <crazycs520@gmail.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>

sre-bot · 2020-04-29T06:53:11Z

cherry pick to release-4.0 in PR #2923

* refine sql diagnosis * refine * refine * refine doc * refine * refine * Update reference/system-databases/inspection-result.md Co-Authored-By: crazycs <crazycs520@gmail.com> * Update reference/system-databases/metrics-schema.md Co-Authored-By: crazycs <crazycs520@gmail.com> * Update reference/system-databases/inspection-summary.md Co-Authored-By: TomShawn <41534398+TomShawn@users.noreply.github.com> * address comment Co-authored-by: crazycs <crazycs520@gmail.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com> Co-authored-by: reafans <30926443+reafans@users.noreply.github.com> Co-authored-by: crazycs <crazycs520@gmail.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>

* refine sql diagnosis * refine * refine * refine doc * refine * refine * Update reference/system-databases/inspection-result.md Co-Authored-By: crazycs <crazycs520@gmail.com> * Update reference/system-databases/metrics-schema.md Co-Authored-By: crazycs <crazycs520@gmail.com> * Update reference/system-databases/inspection-summary.md Co-Authored-By: TomShawn <41534398+TomShawn@users.noreply.github.com> * address comment Co-authored-by: crazycs <crazycs520@gmail.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>

reafans added 2 commits April 15, 2020 12:23

refine sql diagnosis

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Merge branch 'master' of https://github.com/pingcap/docs-cn into refi…

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reafans added translation/done This PR has been translated from English into Chinese and updated to pingcap/docs-cn in a PR. type/bugfix This PR fixes a bug. needs-cherry-pick-4.0 labels Apr 15, 2020

reafans added 2 commits April 15, 2020 15:16

refine

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Merge branch 'master' of https://github.com/pingcap/docs-cn into refi…

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reafans and others added 6 commits April 22, 2020 11:03

Merge branch 'master' of https://github.com/pingcap/docs-cn into refi…

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Merge branch 'refine_sql_diagnosis' of https://github.com/reafans/doc…

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Co-Authored-By: crazycs <crazycs520@gmail.com>

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reference: refine sql diagnosis. (#2756) #2923

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reference: refine sql diagnosis pingcap/docs#2430

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reference: refine sql diagnosis (#2430) pingcap/docs#2493

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		@@ -289,7 +293,7 @@ DETAILS \| the cluster has 2 different tidb versions, execute the sql to see mo
		\| TiKV \| region-count \| pd_scheduler_store_status \| 小于 20000 \| 检测各个 TiKV 节点的 Region 数量，期望单个节点的 Region 数量小于 20000 \|

	* `COMMENT`：对这个监控表的解释。可以看出 `tidb_query_duration` 表是用来查询 TiDB query 执行的百分位时间的，如 P999/P99/P90 的查询耗时，单位是秒。
	* `COMMENT`：对这个监控表的解释。可以看出 `tidb_query_duration` 表是用来查询 TiDB query 执行的百分位时间，如 P999/P99/P90 的查询耗时，单位是秒。

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reafans commented Apr 15, 2020

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