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Update description on rule based index selection #6160

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merged 9 commits into from
Aug 20, 2021

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@Liuxiaozhen12 Liuxiaozhen12 added translation/from-docs-cn This PR is translated from a PR in pingcap/docs-cn. v5.2 This PR/issue applies to TiDB v5.2. labels Aug 13, 2021
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ti-chi-bot commented Aug 13, 2021

[REVIEW NOTIFICATION]

This pull request has been approved by:

  • TomShawn

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@ti-chi-bot ti-chi-bot added the size/M Denotes a PR that changes 30-99 lines, ignoring generated files. label Aug 13, 2021
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@@ -29,23 +29,83 @@ Before introducing index selection, it is important to understand the ways TiDB

## Index selection rules

TiDB provides a heuristic rule named skyline-pruning based on the cost estimation of each operator for accessing tables. It can reduce the probability of wrong index selection caused by wrong estimation.
TiDB selects indexes based on rules or cost. the based rules include pre rules and Skyline-pruning. When selecting an index, TiDB tries the pre rule first. If an index satisfies a pre rule, TiDB directly selects the index. Otherwise, TiDB uses Skyline-pruning to exclude unqualified indexes, and then based on the cost estimation of each operator for accessing tables, selects the index with the lowest cost.
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the based rules -> The based rules
Skyline-pruning -> skyline-pruning it seems that we don't capitalize the first letter before the PR

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I'm not sure whether unqualified corresponds to 不合适. Maybe we can also consider improper or unsuitable?

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unsuitable sounds better. fixed in 40a51d1.

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LGTM

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@xuyifangreeneyes: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

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Good translation!

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@TomShawn TomShawn added the status/require-change Needs the author to address comments. label Aug 19, 2021
@Liuxiaozhen12 Liuxiaozhen12 requested a review from TomShawn August 19, 2021 10:00
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LGTM

@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Aug 20, 2021
@TomShawn TomShawn removed the status/require-change Needs the author to address comments. label Aug 20, 2021
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/remove-status LGT1
/status LGT2

@ti-chi-bot ti-chi-bot added status/LGT2 Indicates that a PR has LGTM 2. and removed status/LGT1 Indicates that a PR has LGTM 1. labels Aug 20, 2021
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/merge

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

Commit hash: d5545ab

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Aug 20, 2021
@ti-chi-bot ti-chi-bot merged commit 26f5741 into pingcap:master Aug 20, 2021
@Liuxiaozhen12 Liuxiaozhen12 deleted the rule-based-index-selection branch August 20, 2021 07:39
TomShawn added a commit that referenced this pull request Oct 8, 2021
* Dumping default consistency description (#5985)

* update max-replicas description (#5984)

* Remove the swappiness parameter (#5987)

* system-variables: update for consistency (#5826)

* Change tidb_memory_usage_alarm_ratio scope to instance (#5988)

* Punctuation fix: Replace 。with . (#6002)

* index page: updated the phase of TiDB Cloud from Beta to Public Preview (#6014)

* Migration FAQs: added the FAQ links of the migration related tools (#6010)

* TiUP cluster: update data_dir (#6009)

* Add kafka downstream example (#6005)

* TiKV configuration: Update description for pin-l0-filter-and-index-blocks (#6008)

* Update the default value of tidb_stmt_summary_max_stmt_count (#6021) (#6023)

* update docs related to partition table dynamic mode (#5997)

* partitioning: Corrected partition management (#5498)

* TiDB binlog: update descriptions about commit ts and passoword (#5986)

* releases: add tidb 4.0.14 release notes (#5996)

* fix a typo for sync_diff_inspector (#6041)

* Update dashboard FAQ (#5895)

* update stale read doc for ga (#6047)

* configure-time-zone: mention `system_time_zone` (#6032)

* Update Security Compatibility with MySQL (#5921)

* correct document of using br backup and restore system tables (#6057)

* Add description about telemetry of builtin functions usage (#6028)

* Add TiDB Dashboard session docs (#6058)

* update br faq (#6060)

* releases: add TiDB 5.1.1 release notes (#6030)

* grafana-overview-dashboard: update the monitoring item for CPS (#6066)

* deploy-tidb-binlog: make the expression on deployment clearer (#6073)

* Add documentation on how to modify gcttl by tiup (#6071)

* remove useless variable (#6076)

* ticdc: add mysql sink user privilege (#6072)

* deleted roadmap.md (#6079)

* TiDB Monitoring Metrics: remove a line (#6081)

* TiDB configuration: add a security option `require-secure-transport` (#6080)

* chore: lock plugin versions (#6089)

* cdc: add compatibility notes for sort-dir (#6086)

* Add gc ttl (#6102) (#6103)

* 5.1.0 release notes: Fix link to telemetry docs (#6106)

* sql-statement-select: Add '...FOR UPDATE NOWAIT' (#6085)

* TiCDC: update a golang demo link (#6055)

* br/use-br-command-line-tool: supplement br note (#6000)

* pr_template: Provides tips for cherry-pick (#6042)

* pr_template: Provides tips for cherry-pick

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* TiDB monitoring: add table storage info status api (#6110)

* update doc for Oracle translate function (#6053)

* ticdc: add explicit_defaults_for_timestamp compatibility troubleshoot (#6115)

* Add print the bad sst files and related information for tikv-ctl (#6109)

* add a missing note (#6129)

* Add docs for auto-tls setting (#6125)

* TiFlash: remove outdated tune advise (#6133)

* TiDB lightning: remove default backend setting (#6132)

* tidb-scheduling: fix typo (#6140)

* Suggest Log Redaction when using TDE (#6147)

* Add infoschema.referential_constraints (#6139)

* Add steps to get lightning goroutine (#6001)

* tiup: fix dead links (#6153)

* Deleted description about not supporting some features. (#6157)

* high-concurrency-best-practices: fix the support info of follower read (#6161)

* Update function list pushed down to tiflash (#6165)

* The `log_dir` should be the log directory (#6168)

* Make IP address of Monitoring & Grafana for Minimal Topology consistent (#6178)

* tikv: add storage flow control doc (#6173)

* TiDB configuration: update the default value of `stmt_max_count` (#6172)

* ticdc-open-api: add ticdc open api doc (#6186)

* System variables: update `broadcast_join_threshold_count` and `broadc… (#6181)

* Update tikv-configuration-file.md (#6180)

* TiFlash configuration: update `io_rate_limit` (#6176)

* Add information of hashAgg for memory control (#6171)

* Update description on rule based index selection (#6160)

* add dr auto sync (#6182)

* update doc for SPM (#6146)

* docs: update rereject leader docs (#6183)

* SQL statement, system variables: update expression indexes (#6185)

* Updated sql-plan-management.md (#6184)

* Introduced 2 new variables (#6159)

* Fix broken link in error codes doc and support doc (#6196)

* docs: fix format for TiKV and PD configuration file template invalid. (#6197)

* docs: separate query statement and result in two text boxes. (#6204) (#6205)

* adopters: add zhihu case study (#6207)

* Added descriptions about slow node detection (#6174)

* pd-control: add new config of balance-hot-region-scheduler (#6148)

* add notice about scaling in pd node (#6099)

* add example for expression index (#6215)

* adopters: remove 404 links (#6214)

* ticdc: fix wording (#6231)

* Revert "System variables: update `broadcast_join_threshold_count` and `broadc…" (#6232)

* Update documents of lock view for sprint 4 (#6179)

* ticdc-open-api: correct some error (#6239)

* best practices: add timeout options for Java best practices (#6136)

* update PR template for v5.2 (#6166)

* chore: stop building temporary (#6252)

* fix typo for sql-plan-management.md (#6248)

* alert rules: update some descriptions (#6250)

* Quick start: update version and TiUP playground supports M1 silicon (#6149)

* fix typo: relaod -> reload (#6235)

* tiny fix on index selection (#6265)

* add commands to check tikv user (#5999)

* br: add restore to systables (#6004)

* br: add restore to systables

* Apply suggestions from code review

Co-authored-by: TomShawn <[email protected]>

Co-authored-by: TomShawn <[email protected]>

* statement summary: update statement summary doc (#6084)

* Require process privilege for dumpling (#6187)

* tiflash: Remove the description about expr_blacklist in use_tiflash.md (#6188)

* Add description about table name/alias specifying for read_from_storage hint (#6164)

* complex tidb binlog.yaml: add checkpoint info (#6216)

* TiKV configuration: remove redundant instructions (#6218)

* alert rules: remove some descriptions (#6223)

* Revert "add dr auto sync" (#6294)

* TiFlash Config: Add annotation (v5.2.0) (#6296)

* sql: improve kill's description (#6233)

* Add v5.2 TPCH report (#6170)

* docs: fix expression index's document again (#6295)

* system variables.md: add a warning message (#6298)

* sql-statement: Add ADMIN SHOW TELEMETRY (#6138)

* tiup: add notice about importing cluster (#6108)

* Bump version for v5.2.0 (#6191)

* add TiDB 5.2.0 release note (#6237)

* add two HTAP documents (#6206)

* benchmark: add v5.2 benchmark results (#6319)

* Fix title typo (#6324)

* release note: update feature description (#6325)

* adopters: add xiaomi (#6303)

* chore: migrate scripts to docs (#6338)

* credits: update links to the full list of code and docs contributors (#6111)

* TiUP: add instructions for offline mirror (#6137)

* tune tikv memory performance: remove description for sync-log (#6234)

* dashboard statement list: add a note to explain the blue bar and yellow line (#6189)

* release 5.1.0: add compatibility change for `tidb_enable_noop_functions` (#6222)

* modify configuration online: remove unsupported parameters (#6300)

* modify configuration online: change a name for consistency (#6301)

* Migrate from Aurora: update Aurora MySQL dumpling command (#6335)

* PD configuration file: add log level (#6302)

* TiDB Binlog config: update "syncer.to.checkpoint" info (#6340)

* update doc on wal-recovery-mode and use-direct-io-for-flush-and-compaction (#6163)

* Fix TOC display error (#6369)

* sql: fix the correctness problem about kill (#6377)

* change expressions related to statement summary tables (#6299)

* Update grafana-pd-dashboard.md (#6388)

* system variables: update description about `tidb_opt_prefer_range_scan` (#6389)

* Update alert rule for low space (#6376)

* chore: add dispatch back (#6404)

* Add description for TiKV Ready handled panel (#6375)

* TiKV config: fix wrong description about `compaction-readahead-size` (#6371)

* update transaction doc (#6158)

* BR FAQ: add a warning about multi br importing (#6263)

* Configuration Options: remove two TiDB's command options (#6370)

* system-variables: improve noop functions warning (#6374)

* add doc links to overview.md (#6422)

* chore: fix byte encode (#6428)

* performance_schema -> information_schema (#6418)

* chore: update ci scripts (#6429)

* Enhance TiDB login descriptions - EN (#6427)

* release-notes: add 5.2.1 release notes (#6438)

* basic features: add feature matrix (#6130)

* release note: add a check item for feedback-probability (#6405)

* Update system variables for correctness (#6224)

* encryption-at-rest: Update (#6152)

* basic-features: collapse charset and collations (#6452)

* system-variables: update from generated source (#6451)

* fix-enable-compaction-filter-in-tikv-configuration-file (#6403)

* Update the related variable description for CREATE INDEX (#6434)

* TiKV config: add 7 log-related congifurations (#6372)

* Configure placement rules: fix placement doc (#6450)

* adopters: add Pinterest (#6443)

* release-5.2.0: Add info about caching_sha2 (#6344)

* faq: add info for schema is changed error (#6453)

* Update enable-tls-between-clients-and-servers.md (#6493)

* adopters: remove Pinterest (#6501)

* Fix wrong wording in mysql-compatibility.md (#6511)

* adopters: add Huya Live (#6516)

* tidb-configuration-file: correct the default value of committer-concurrency (#6526)

* Tune TiKV: change the default value of `grpc-concurrency` (#6531)

* releases: add tidb 4.0.15 release notes (#6475)

* releases: add tidb 5.0.4 release notes (#6449)

* releases: add tidb 5.1.2 release notes (#6500)

* releases: add TiDB 5.1.2-10-06-33 release notes

* releases: add TiDB 5.1.2-10-06-33 release notes
* Update releases/release-5.1.2-10-06-33.md

* toc

* Apply suggestions from code review

Co-authored-by: Liuxiaozhen12 <[email protected]>

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

* add notes from comments

* add more tidb notes

* Update releases/release-5.1.2.md

Co-authored-by: Yuanjia Zhang <[email protected]>

* Apply suggestions from code review

* Apply suggestions from code review

Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: Enwei <[email protected]>
Co-authored-by: xixirangrang <[email protected]>

* Update releases/release-5.1.2.md

Co-authored-by: shichun-0415 <[email protected]>

* Update releases/release-5.1.2.md

Co-authored-by: Yuanjia Zhang <[email protected]>

* Apply suggestions from code review

Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: shichun-0415 <[email protected]>

* replace pr numbers with issue numbers

* Update releases/release-5.1.2.md

Co-authored-by: Liuxiaozhen12 <[email protected]>

* Apply suggestions from code review

Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: Enwei <[email protected]>

* fix

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

* Apply suggestions from code review

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

Co-authored-by: Enwei <[email protected]>

* Update releases/release-5.1.2.md

Co-authored-by: Grace Cai <[email protected]>

* Update releases/release-5.1.2.md

* Apply suggestions from code review

* Apply suggestions from code review

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

Co-authored-by: Enwei <[email protected]>

* Update releases/release-5.1.2.md

Co-authored-by: shichun-0415 <[email protected]>

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

* Apply suggestions from code review

* move notes

Co-authored-by: TomShawn <[email protected]>
Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: Grace Cai <[email protected]>
Co-authored-by: Yuanjia Zhang <[email protected]>
Co-authored-by: Enwei <[email protected]>
Co-authored-by: xixirangrang <[email protected]>
Co-authored-by: shichun-0415 <[email protected]>

* remove a note about `raftstore.sync-log` (#6563)

* Add desc of "Storage Write Stall" row in the TiFlash grafana (#6524)

* system variables: update tidb_enable_noop_functions behavior (#6525)

* system variables: document last_insert_id (#6502)

* docs: update pd-configuration about upgrade (#6510)

* fix example for expression index (#6499)

* tidb: fix default value of performance.committer-concurrency (#6498)

* chore: remove circleci config (#6577)

* Document missing sysvars (#6485)

* system-variables: add skip-name-resolve (#6491)

* Document a few more system variables (#6492)

* add dr auto sync (#6592)

* Update from master

Co-authored-by: Enwei <[email protected]>
Co-authored-by: disksing <[email protected]>
Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: Morgan Tocker <[email protected]>
Co-authored-by: Daniël van Eeden <[email protected]>
Co-authored-by: Grace Cai <[email protected]>
Co-authored-by: Ti Chi Robot <[email protected]>
Co-authored-by: Mattias Jonsson <[email protected]>
Co-authored-by: ti-srebot <[email protected]>
Co-authored-by: glorv <[email protected]>
Co-authored-by: Suhaha <[email protected]>
Co-authored-by: Ian <[email protected]>
Co-authored-by: Yu Lei <[email protected]>
Co-authored-by: Wenxuan <[email protected]>
Co-authored-by: zhouqiang <[email protected]>
Co-authored-by: xixirangrang <[email protected]>
Co-authored-by: Yini Xu <[email protected]>
Co-authored-by: WangZhengru <[email protected]>
Co-authored-by: Xintao <[email protected]>
Co-authored-by: Daniël van Eeden <[email protected]>
Co-authored-by: Allen Zhong <[email protected]>
Co-authored-by: ruoxi <[email protected]>
Co-authored-by: Yasuo Honda <[email protected]>
Co-authored-by: Yasuo Honda <[email protected]>
Co-authored-by: Defined2014 <[email protected]>
Co-authored-by: Ran <[email protected]>
Co-authored-by: Chengpeng Yan <[email protected]>
Co-authored-by: Yifan Xu <[email protected]>
Co-authored-by: Weizhen Wang <[email protected]>
Co-authored-by: Ziqian Qin <[email protected]>
Co-authored-by: shichun-0415 <[email protected]>
Co-authored-by: you06 <[email protected]>
Co-authored-by: Fendy <[email protected]>
Co-authored-by: Kolbe Kegel <[email protected]>
Co-authored-by: jirongq <[email protected]>
Co-authored-by: Caitin <[email protected]>
Co-authored-by: Yuanjia Zhang <[email protected]>
Co-authored-by: JaySon <[email protected]>
Co-authored-by: unconsolable <[email protected]>
TomShawn added a commit that referenced this pull request Oct 9, 2021
* Dumping default consistency description (#5985)

* update max-replicas description (#5984)

* Remove the swappiness parameter (#5987)

* system-variables: update for consistency (#5826)

* Change tidb_memory_usage_alarm_ratio scope to instance (#5988)

* Punctuation fix: Replace 。with . (#6002)

* index page: updated the phase of TiDB Cloud from Beta to Public Preview (#6014)

* Migration FAQs: added the FAQ links of the migration related tools (#6010)

* TiUP cluster: update data_dir (#6009)

* Add kafka downstream example (#6005)

* TiKV configuration: Update description for pin-l0-filter-and-index-blocks (#6008)

* Update the default value of tidb_stmt_summary_max_stmt_count (#6021) (#6023)

* update docs related to partition table dynamic mode (#5997)

* partitioning: Corrected partition management (#5498)

* TiDB binlog: update descriptions about commit ts and passoword (#5986)

* releases: add tidb 4.0.14 release notes (#5996)

* fix a typo for sync_diff_inspector (#6041)

* Update dashboard FAQ (#5895)

* update stale read doc for ga (#6047)

* configure-time-zone: mention `system_time_zone` (#6032)

* Update Security Compatibility with MySQL (#5921)

* correct document of using br backup and restore system tables (#6057)

* Add description about telemetry of builtin functions usage (#6028)

* Add TiDB Dashboard session docs (#6058)

* update br faq (#6060)

* releases: add TiDB 5.1.1 release notes (#6030)

* grafana-overview-dashboard: update the monitoring item for CPS (#6066)

* deploy-tidb-binlog: make the expression on deployment clearer (#6073)

* Add documentation on how to modify gcttl by tiup (#6071)

* remove useless variable (#6076)

* ticdc: add mysql sink user privilege (#6072)

* deleted roadmap.md (#6079)

* TiDB Monitoring Metrics: remove a line (#6081)

* TiDB configuration: add a security option `require-secure-transport` (#6080)

* chore: lock plugin versions (#6089)

* cdc: add compatibility notes for sort-dir (#6086)

* Add gc ttl (#6102) (#6103)

* 5.1.0 release notes: Fix link to telemetry docs (#6106)

* sql-statement-select: Add '...FOR UPDATE NOWAIT' (#6085)

* TiCDC: update a golang demo link (#6055)

* br/use-br-command-line-tool: supplement br note (#6000)

* pr_template: Provides tips for cherry-pick (#6042)

* pr_template: Provides tips for cherry-pick

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* TiDB monitoring: add table storage info status api (#6110)

* update doc for Oracle translate function (#6053)

* ticdc: add explicit_defaults_for_timestamp compatibility troubleshoot (#6115)

* Add print the bad sst files and related information for tikv-ctl (#6109)

* add a missing note (#6129)

* Add docs for auto-tls setting (#6125)

* TiFlash: remove outdated tune advise (#6133)

* TiDB lightning: remove default backend setting (#6132)

* tidb-scheduling: fix typo (#6140)

* Suggest Log Redaction when using TDE (#6147)

* Add infoschema.referential_constraints (#6139)

* Add steps to get lightning goroutine (#6001)

* tiup: fix dead links (#6153)

* Deleted description about not supporting some features. (#6157)

* high-concurrency-best-practices: fix the support info of follower read (#6161)

* Update function list pushed down to tiflash (#6165)

* The `log_dir` should be the log directory (#6168)

* Make IP address of Monitoring & Grafana for Minimal Topology consistent (#6178)

* tikv: add storage flow control doc (#6173)

* TiDB configuration: update the default value of `stmt_max_count` (#6172)

* ticdc-open-api: add ticdc open api doc (#6186)

* System variables: update `broadcast_join_threshold_count` and `broadc… (#6181)

* Update tikv-configuration-file.md (#6180)

* TiFlash configuration: update `io_rate_limit` (#6176)

* Add information of hashAgg for memory control (#6171)

* Update description on rule based index selection (#6160)

* add dr auto sync (#6182)

* update doc for SPM (#6146)

* docs: update rereject leader docs (#6183)

* SQL statement, system variables: update expression indexes (#6185)

* Updated sql-plan-management.md (#6184)

* Introduced 2 new variables (#6159)

* Fix broken link in error codes doc and support doc (#6196)

* docs: fix format for TiKV and PD configuration file template invalid. (#6197)

* docs: separate query statement and result in two text boxes. (#6204) (#6205)

* adopters: add zhihu case study (#6207)

* Added descriptions about slow node detection (#6174)

* pd-control: add new config of balance-hot-region-scheduler (#6148)

* add notice about scaling in pd node (#6099)

* add example for expression index (#6215)

* adopters: remove 404 links (#6214)

* ticdc: fix wording (#6231)

* Revert "System variables: update `broadcast_join_threshold_count` and `broadc…" (#6232)

* Update documents of lock view for sprint 4 (#6179)

* ticdc-open-api: correct some error (#6239)

* best practices: add timeout options for Java best practices (#6136)

* update PR template for v5.2 (#6166)

* chore: stop building temporary (#6252)

* fix typo for sql-plan-management.md (#6248)

* alert rules: update some descriptions (#6250)

* Quick start: update version and TiUP playground supports M1 silicon (#6149)

* fix typo: relaod -> reload (#6235)

* tiny fix on index selection (#6265)

* add commands to check tikv user (#5999)

* br: add restore to systables (#6004)

* br: add restore to systables

* Apply suggestions from code review

Co-authored-by: TomShawn <[email protected]>

Co-authored-by: TomShawn <[email protected]>

* statement summary: update statement summary doc (#6084)

* Require process privilege for dumpling (#6187)

* tiflash: Remove the description about expr_blacklist in use_tiflash.md (#6188)

* Add description about table name/alias specifying for read_from_storage hint (#6164)

* complex tidb binlog.yaml: add checkpoint info (#6216)

* TiKV configuration: remove redundant instructions (#6218)

* alert rules: remove some descriptions (#6223)

* Revert "add dr auto sync" (#6294)

* TiFlash Config: Add annotation (v5.2.0) (#6296)

* sql: improve kill's description (#6233)

* Add v5.2 TPCH report (#6170)

* docs: fix expression index's document again (#6295)

* system variables.md: add a warning message (#6298)

* sql-statement: Add ADMIN SHOW TELEMETRY (#6138)

* tiup: add notice about importing cluster (#6108)

* Bump version for v5.2.0 (#6191)

* add TiDB 5.2.0 release note (#6237)

* add two HTAP documents (#6206)

* benchmark: add v5.2 benchmark results (#6319)

* Fix title typo (#6324)

* release note: update feature description (#6325)

* adopters: add xiaomi (#6303)

* chore: migrate scripts to docs (#6338)

* credits: update links to the full list of code and docs contributors (#6111)

* TiUP: add instructions for offline mirror (#6137)

* tune tikv memory performance: remove description for sync-log (#6234)

* dashboard statement list: add a note to explain the blue bar and yellow line (#6189)

* release 5.1.0: add compatibility change for `tidb_enable_noop_functions` (#6222)

* modify configuration online: remove unsupported parameters (#6300)

* modify configuration online: change a name for consistency (#6301)

* Migrate from Aurora: update Aurora MySQL dumpling command (#6335)

* PD configuration file: add log level (#6302)

* TiDB Binlog config: update "syncer.to.checkpoint" info (#6340)

* update doc on wal-recovery-mode and use-direct-io-for-flush-and-compaction (#6163)

* Fix TOC display error (#6369)

* sql: fix the correctness problem about kill (#6377)

* change expressions related to statement summary tables (#6299)

* Update grafana-pd-dashboard.md (#6388)

* system variables: update description about `tidb_opt_prefer_range_scan` (#6389)

* Update alert rule for low space (#6376)

* chore: add dispatch back (#6404)

* Add description for TiKV Ready handled panel (#6375)

* TiKV config: fix wrong description about `compaction-readahead-size` (#6371)

* update transaction doc (#6158)

* BR FAQ: add a warning about multi br importing (#6263)

* Configuration Options: remove two TiDB's command options (#6370)

* system-variables: improve noop functions warning (#6374)

* add doc links to overview.md (#6422)

* chore: fix byte encode (#6428)

* performance_schema -> information_schema (#6418)

* chore: update ci scripts (#6429)

* Enhance TiDB login descriptions - EN (#6427)

* release-notes: add 5.2.1 release notes (#6438)

* basic features: add feature matrix (#6130)

* release note: add a check item for feedback-probability (#6405)

* Update system variables for correctness (#6224)

* encryption-at-rest: Update (#6152)

* basic-features: collapse charset and collations (#6452)

* system-variables: update from generated source (#6451)

* fix-enable-compaction-filter-in-tikv-configuration-file (#6403)

* Update the related variable description for CREATE INDEX (#6434)

* TiKV config: add 7 log-related congifurations (#6372)

* Configure placement rules: fix placement doc (#6450)

* adopters: add Pinterest (#6443)

* release-5.2.0: Add info about caching_sha2 (#6344)

* faq: add info for schema is changed error (#6453)

* Update enable-tls-between-clients-and-servers.md (#6493)

* adopters: remove Pinterest (#6501)

* Fix wrong wording in mysql-compatibility.md (#6511)

* adopters: add Huya Live (#6516)

* tidb-configuration-file: correct the default value of committer-concurrency (#6526)

* Tune TiKV: change the default value of `grpc-concurrency` (#6531)

* releases: add tidb 4.0.15 release notes (#6475)

* releases: add tidb 5.0.4 release notes (#6449)

* releases: add tidb 5.1.2 release notes (#6500)

* releases: add TiDB 5.1.2-10-06-33 release notes

* releases: add TiDB 5.1.2-10-06-33 release notes
* Update releases/release-5.1.2-10-06-33.md

* toc

* Apply suggestions from code review

Co-authored-by: Liuxiaozhen12 <[email protected]>

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

* add notes from comments

* add more tidb notes

* Update releases/release-5.1.2.md

Co-authored-by: Yuanjia Zhang <[email protected]>

* Apply suggestions from code review

* Apply suggestions from code review

Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: Enwei <[email protected]>
Co-authored-by: xixirangrang <[email protected]>

* Update releases/release-5.1.2.md

Co-authored-by: shichun-0415 <[email protected]>

* Update releases/release-5.1.2.md

Co-authored-by: Yuanjia Zhang <[email protected]>

* Apply suggestions from code review

Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: shichun-0415 <[email protected]>

* replace pr numbers with issue numbers

* Update releases/release-5.1.2.md

Co-authored-by: Liuxiaozhen12 <[email protected]>

* Apply suggestions from code review

Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: Enwei <[email protected]>

* fix

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

* Apply suggestions from code review

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

Co-authored-by: Enwei <[email protected]>

* Update releases/release-5.1.2.md

Co-authored-by: Grace Cai <[email protected]>

* Update releases/release-5.1.2.md

* Apply suggestions from code review

* Apply suggestions from code review

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

Co-authored-by: Enwei <[email protected]>

* Update releases/release-5.1.2.md

Co-authored-by: shichun-0415 <[email protected]>

* Update releases/release-5.1.2.md

* Update releases/release-5.1.2.md

* Apply suggestions from code review

* move notes

Co-authored-by: TomShawn <[email protected]>
Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: Grace Cai <[email protected]>
Co-authored-by: Yuanjia Zhang <[email protected]>
Co-authored-by: Enwei <[email protected]>
Co-authored-by: xixirangrang <[email protected]>
Co-authored-by: shichun-0415 <[email protected]>

* remove a note about `raftstore.sync-log` (#6563)

* Add desc of "Storage Write Stall" row in the TiFlash grafana (#6524)

* system variables: update tidb_enable_noop_functions behavior (#6525)

* system variables: document last_insert_id (#6502)

* docs: update pd-configuration about upgrade (#6510)

* fix example for expression index (#6499)

* tidb: fix default value of performance.committer-concurrency (#6498)

* chore: remove circleci config (#6577)

* Document missing sysvars (#6485)

* system-variables: add skip-name-resolve (#6491)

* Document a few more system variables (#6492)

* add dr auto sync (#6592)

* tiflash, metric: add alert for TiFlash down (#6590)

Co-authored-by: Enwei <[email protected]>
Co-authored-by: disksing <[email protected]>
Co-authored-by: Liuxiaozhen12 <[email protected]>
Co-authored-by: Morgan Tocker <[email protected]>
Co-authored-by: Daniël van Eeden <[email protected]>
Co-authored-by: Grace Cai <[email protected]>
Co-authored-by: Ti Chi Robot <[email protected]>
Co-authored-by: Mattias Jonsson <[email protected]>
Co-authored-by: ti-srebot <[email protected]>
Co-authored-by: glorv <[email protected]>
Co-authored-by: Suhaha <[email protected]>
Co-authored-by: Ian <[email protected]>
Co-authored-by: Yu Lei <[email protected]>
Co-authored-by: Wenxuan <[email protected]>
Co-authored-by: zhouqiang <[email protected]>
Co-authored-by: xixirangrang <[email protected]>
Co-authored-by: Yini Xu <[email protected]>
Co-authored-by: WangZhengru <[email protected]>
Co-authored-by: Xintao <[email protected]>
Co-authored-by: Daniël van Eeden <[email protected]>
Co-authored-by: Allen Zhong <[email protected]>
Co-authored-by: ruoxi <[email protected]>
Co-authored-by: Yasuo Honda <[email protected]>
Co-authored-by: Yasuo Honda <[email protected]>
Co-authored-by: Defined2014 <[email protected]>
Co-authored-by: Ran <[email protected]>
Co-authored-by: Chengpeng Yan <[email protected]>
Co-authored-by: Yifan Xu <[email protected]>
Co-authored-by: Weizhen Wang <[email protected]>
Co-authored-by: Ziqian Qin <[email protected]>
Co-authored-by: shichun-0415 <[email protected]>
Co-authored-by: you06 <[email protected]>
Co-authored-by: Fendy <[email protected]>
Co-authored-by: Kolbe Kegel <[email protected]>
Co-authored-by: jirongq <[email protected]>
Co-authored-by: Caitin <[email protected]>
Co-authored-by: Yuanjia Zhang <[email protected]>
Co-authored-by: JaySon <[email protected]>
Co-authored-by: unconsolable <[email protected]>
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