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releases: add 6.6.0 release notes #12652

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Feb 20, 2023
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0030f9a
6.6.0 release notes template
TomShawn Jan 12, 2023
e8da094
release note for tiflash & store-io-pool-size
joey-yez Jan 17, 2023
2f5810a
Revert "release note for tiflash & store-io-pool-size"
joey-yez Jan 17, 2023
2eb8a79
add note for tiflash & store-io-pool-size
joey-yez Jan 17, 2023
feb0657
FD-1124
songrijie Jan 18, 2023
cc11643
multi-valued index
songrijie Jan 18, 2023
ce59080
resource control included
songrijie Jan 18, 2023
099994d
include contributors in resource control
songrijie Jan 18, 2023
d1e39e6
create binding from memory GA
songrijie Jan 18, 2023
426f4a9
indexlookup batch operations
songrijie Jan 19, 2023
ce2bed3
optimizer hints included
songrijie Jan 19, 2023
045f4eb
removing a few restrictions from plan cache
songrijie Jan 19, 2023
16e9656
append user docs to multi-valued index
songrijie Jan 19, 2023
f9cf050
Diagnosis info for plan-cache
songrijie Jan 19, 2023
4a7fc2f
Stable Wakeup Model
songrijie Jan 19, 2023
5d64246
include warning in slow query
songrijie Jan 19, 2023
a95e1ee
address comment for stable wakeup model
songrijie Jan 28, 2023
66f37d7
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pingyu Jan 29, 2023
c4c33da
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hfxsd Jan 29, 2023
a42d3af
Merge branch '6.6-release-notes' of https://github.com/TomShawn/docs-…
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0e25eb6
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236 changes: 236 additions & 0 deletions releases/release-6.6.0.md
Original file line number Diff line number Diff line change
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---
title: TiDB 6.6.0 Release Notes
---
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# TiDB 6.6.0 Release Notes

发版日期:2023 年 x 月 x 日

TiDB 版本:6.6.0

试用链接:[快速体验](https://docs.pingcap.com/zh/tidb/v6.6/quick-start-with-tidb) | [下载离线包](https://cn.pingcap.com/product-community/)

在 6.6.0 版本中,你可以获得以下关键特性:

- 关键特性 1
- 关键特性 2
- 关键特性 3
- ......

## 新功能

### SQL

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。
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### 安全

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

### 可观测性

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

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### 性能

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

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### 事务

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

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### 稳定性

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

### 易用性

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)
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功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

### MySQL 兼容性

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

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功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。
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### 数据迁移

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* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

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更多信息,请参考[用户文档](链接)。

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### 数据共享与订阅

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* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

### 部署及运维

* 功能标题 [#issue号](链接) @[贡献者 GitHub ID](链接)

功能描述(需要包含这个功能是什么、在什么场景下对用户有什么价值、怎么用)

更多信息,请参考[用户文档](链接)。

## 兼容性变更

### 系统变量

| 变量名 | 修改类型(包括新增/修改/删除) | 描述 |
|--------|------------------------------|------|
| | | |
| | | |
| | | |
| | | |

### 配置文件参数

| 配置文件 | 配置项 | 修改类型 | 描述 |
| -------- | -------- | -------- | -------- |
| | | | |
| | | | |
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| | | | |

### 其他

## 废弃功能

## 改进提升

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Suggested change
- note [#issue](链接) @[贡献者 GitHub ID](链接)
- 优化一些参数的默认值,当partitioned-raft-kv开启时block-cache调整为0.3可用内存(原来是0.45), region-split-size调整为10GB。当沿用raft-kv时且enable-region-bucket为true时,region-split-size默认调整为1GB [#12842](https://github.com/tikv/tikv/issues/12842) @[tonyxuqqi] (https://github.com/tonyxuqqi)
- 支持在Raftstore异步写入中的优先级调度[#13730] (https://github.com/tikv/tikv/issues/13730) @[Connor1996] (https://github.com/Connor1996)
- 支持TiKV在小于1 core的CPU下启动 [#13586] [#13752] [#14017] (https://github.com/tikv/tikv/issues/13586) @[andreid-db] (https://github.com/andreid-db)
- 修改rocksdb.defaultcf.block-size以及rocksdb.writecf.block-size的默认参数为16KB [#14052] (https://github.com/tikv/tikv/issues/14052) @[tonyxuqqi] (https://github.com/tonyxuqqi)
- raftstore: 优化slow score探测的新机制,加入新的`evict-slow-trend-scheduler`。[#14131] (https://github.com/tikv/tikv/issues/14131) @[innerr] (https://github.com/innerr)
- rocksdb的block cache强制为共享的。不支持按照CF单独设置Block cache [#12936] (https://github.com/tikv/tikv/issues/12936) @[busyjay] (https://github.com/busyjay)

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+ PD

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+ TiFlash

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+ TiCDC
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## 错误修复

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Suggested change
- note [#issue](链接) @[贡献者 GitHub ID](链接)
- 优化了删除分区表所依赖的列时的错误提示 [#38739](https://github.com/pingcap/tidb/issues/38739) @[jiyfhust](https://github.com/jiyfhust)
- 修复了 DDL 回填数据时频繁发生的事务写冲突问题 [#24427](https://github.com/pingcap/tidb/issues/24427) @[mjonss](https://github.com/mjonss)
- 增加了 FLASHBACK CLUSTER 在检查 `min-resolved-ts` 失败后的重试机制 [#39836](https://github.com/pingcap/tidb/issues/39836) @[Defined2014](https://github.com/Defined2014)
- 修复了部分情况下空表不能使用 ingest 模式添加索引的问题 [#39641](https://github.com/pingcap/tidb/issues/39641) @[tangenta](https://github.com/tangenta)
- 修复了同一个事务中不同 SQL 的慢日志 `wait_ts` 相同的问题 [#39713](https://github.com/pingcap/tidb/issues/39713) @[TonsnakeLin](https://github.com/TonsnakeLin)
- 修复了添加列的过程中删除行记录报 "Assertion Failed" 错误的问题 [#39570](https://github.com/pingcap/tidb/issues/39570) @[wjhuang2016](https://github.com/wjhuang2016)
- 修复了修改列类型时报 "not a DDL owner" 错误的问题 [#39643](https://github.com/pingcap/tidb/issues/39643) @[zimulala](https://github.com/zimulala)
- 修复了 AUTO_INCREMENT 列自动分配值耗尽后插入一行不报错的问题 [#38950](https://github.com/pingcap/tidb/issues/38950) @[Dousir9](https://github.com/Dousir9)
- 修复了创建表达式索引时报 "Unknown column" 错误的问题 [#39784](https://github.com/pingcap/tidb/issues/39784) @[Defined2014](https://github.com/Defined2014)
- 修复了生成列表达式包含表名时,重命名表后无法插入数据的问题 [#39826](https://github.com/pingcap/tidb/issues/39826) @[Defined2014](https://github.com/Defined2014)
- 修复了列在 write-only 状态下 INSERT IGNORE 语句无法正确填充默认值的问题 [#40192](https://github.com/pingcap/tidb/issues/40192) @[YangKeao](https://github.com/YangKeao)
- 修复了资源管控模块关闭时未能释放资源的问题 [#40546](https://github.com/pingcap/tidb/issues/40546) @[zimulala](https://github.com/zimulala)
- 不支持在分区表上执行 MODIFY COLUMN [#39915](https://github.com/pingcap/tidb/issues/39915) @[wjhuang2016](https://github.com/wjhuang2016)
- 禁止重命名分区表所依赖的列 [#40150](https://github.com/pingcap/tidb/issues/40150) @[mjonss](https://github.com/mjonss)
- 修复了 TTL 任务不能及时触发统计信息更新的问题 [#40109](https://github.com/pingcap/tidb/issues/40109) @[YangKeao](https://github.com/YangKeao)
- 修复了 TiDB 构造 key 范围时对 null 值处理不当导致读到预期外数据的行为 [#40158](https://github.com/pingcap/tidb/issues/40158) @[tiancaiamao](https://github.com/tiancaiamao)
- 修复了 MODIFY COLUMN 同时修改列默认值导致写入非法值的问题 [#40164](https://github.com/pingcap/tidb/issues/40164) @[wjhuang2016](https://github.com/wjhuang2016)
- 修复了表 region 比较多时因 region 缓存失效导致加索引效率低下的问题 [#38436](https://github.com/pingcap/tidb/issues/38436) @[tangenta](https://github.com/tangenta)
- 修复了分配自增 ID 时的数据竞争问题 [#40584](https://github.com/pingcap/tidb/issues/40584) @[Dousir9](https://github.com/Dousir9)
- 修复了 JSON 的 not 表达式实现与 MySQL 实现不兼容的问题 [#40683](https://github.com/pingcap/tidb/issues/40683) @[YangKeao](https://github.com/YangKeao)
- 修复了并发视图时可能会造成 DDL 操作卡住的问题 [#40352](https://github.com/pingcap/tidb/issues/40352) @[zeminzhou](https://github.com/zeminzhou)
- 修复了并发对分区表执行 Modify Column 的 DDL 操作时有可能会造成数据不一致的问题 [#40620](https://github.com/pingcap/tidb/issues/40620) @[mjonss](https://github.com/mjonss)
- 修复了使用 `caching_sha2_password` 方式进行认证时如果不指定的密码会报错 "Malformed packet" 的问题 [#40831](https://github.com/pingcap/tidb/issues/40831) @[dveeden](https://github.com/dveeden)
- 修复了在执行 TTL 任务时,如果表的主键包含 `ENUM` 类型的列任务会失败的问题 [#40456](https://github.com/pingcap/tidb/issues/40456) @[lcwangchao](https://github.com/lcwangchao)
- 修复了某些被 MDL 阻塞的 DDL 操作无法在 `mysql.tidb_mdl_view` 中查询到的问题 [#40838](https://github.com/pingcap/tidb/issues/40838) @[YangKeao](https://github.com/YangKeao)
- 修复了 DDL 在 ingest 过程中可能会发生数据竞争的问题 [#40970](https://github.com/pingcap/tidb/issues/40970) @[tangenta](https://github.com/tangenta)
- 修复了在改变时区后 TTL 任务可能会错误删除某些数据的问题 [41043](https://github.com/pingcap/tidb/issues/41043) @[lcwangchao](https://github.com/lcwangchao)
- 修复了 `JSON_OBJECT` 在某些情况下会报错的问题 [#39997](https://github.com/pingcap/tidb/pull/39997) @[YangKeao](https://github.com/YangKeao)
- 修复了 TiDB 在初始化时有可能死锁的问题 [#40408](https://github.com/pingcap/tidb/issues/40408) @[Defined2014](https://github.com/Defined2014)
- 修复了内存重用导致的在某些情况下系统变量的值会被错误修改的问题 [#40979](https://github.com/pingcap/tidb/issues/40979) @[lcwangchao](https://github.com/lcwangchao)
- 修复了 ingest 模式下创建唯一索引可能会导致数据和索引不一致的问题 [#40464](https://github.com/pingcap/tidb/issues/40464) @[tangenta](https://github.com/tangenta)
- 修复了并发 truncate 同一张表时部分 truncate 操作无法被 MDL 阻塞的问题 [#40484](https://github.com/pingcap/tidb/issues/40484) @[wjhuang2016](https://github.com/wjhuang2016)
- 修复了 `SHOW PRIVILEGES` 命令显示的权限列表不完整的问题 [#40591](https://github.com/pingcap/tidb/issues/40591) @[CbcWestwolf](https://github.com/CbcWestwolf)
- 修复了在 ADD UNIQUE INDEX 时有可能会 PANIC 的问题 [#40592](https://github.com/pingcap/tidb/issues/40592) @[tangenta](https://github.com/tangenta)
- 修复了 ADMIN RECOVER 操作可能会造成索引数据损坏的问题 [#40430](https://github.com/pingcap/tidb/issues/40430) @[xiongjiwei](https://github.com/xiongjiwei)
- 修复了表达式索引中含有 CAST 时对表进行查询可能出错的问题 [#40129](https://github.com/pingcap/tidb/pull/40129) @[xiongjiwei](https://github.com/xiongjiwei)
- 修复了某些情况下唯一索引仍然可能产生重复数据的问题 [#40217](https://github.com/pingcap/tidb/issues/40217) @[tangenta](https://github.com/tangenta)
- 修复了使用 Prepare/Execute 查询某些虚拟表时无法将表 ID 下推导致在大量 Region 的情况下 PD OOM 的问题 [#39605](https://github.com/pingcap/tidb/issues/39605) @[djshow832](https://github.com/djshow832)
- 修复了添加索引时可能导致数据竞争的问题 [#40879](https://github.com/pingcap/tidb/issues/40879) @[tangenta](https://github.com/tangenta)

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- 修复了 IndexMerge 算子在触发内存限制行为时可能导致 tidb-server 崩溃的问题[#41036](https://github.com/pingcap/tidb/pull/41036) @[guo-shaoge](https://github.com/guo-shaoge)
- 修复了在分区表上执行查询 `select * from t limit 1` 时,执行速度慢的问题[#40741](https://github.com/pingcap/tidb/pull/40741)@[solotzg](https://github.com/solotzg)

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Suggested change
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- 修复了过期的 region cache 可能残留导致的内存泄漏和性能下降问题 [#40461](https://github.com/pingcap/tidb/issues/40461) @[sticnarf](https://github.com/sticnarf)


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- 修复cast const Enum 到其他类型时的错误 [#14156](https://github.com/tikv/tikv/issues/14156) @[wshwsh12] (https://github.com/wshwsh12)
- 减少resolve-ts带来的网络流量 [#14098] (https://github.com/tikv/tikv/issues/14092) @[overvenus] (https://github.com/overvenus)
- 支持TiKV在小于1 core的CPU下启动 [#13586] [#13752] [#14017] (https://github.com/tikv/tikv/issues/13586) @[andreid-db] (https://github.com/andreid-db)
- copr: 修复old collation时Like中的 _ pattern的行为[#13785] (https://github.com/tikv/tikv/pull/13785) @[Yangkeao] (https://github.com/Yangkeao)
- txn: 在重复的acqurie_pessimsitic_lock请求时的做限制性检查。修复并发的DML时当TiDB和TiKV有网络故障时潜在的数据不一致。 [#14038] (https://github.com/tikv/tikv/issues/14038) @[myonkeminta] (https://github.com/myonkeminta)

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+ PD

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+ TiDB Data Migration (DM)

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+ TiUP

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## 贡献者

感谢来自 TiDB 社区的贡献者们:

- [贡献者 GitHub ID]()