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releases, readme: add 2.0.8 releases notes
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lilin90 committed Oct 16, 2018
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1 change: 1 addition & 0 deletions README.md
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- [常见问题与解答(FAQ)](FAQ.md)
- [最佳实践](https://pingcap.com/blog-cn/tidb-best-practice/)
+ [版本发布历史](releases/rn.md)
- [2.0.8](releases/208.md)
- [2.1 RC3](releases/21rc3.md)
- [2.1 RC2](releases/21rc2.md)
- [2.0.7](releases/207.md)
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29 changes: 29 additions & 0 deletions releases/208.md
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---
title: TiDB 2.0.8 release notes
category: Releases
---

# TiDB 2.0.8 Release Notes

2018 年 10 月 16 日,TiDB 发布 2.0.8 版。该版本在 2.0.7 版的基础上,对系统兼容性、稳定性做出了改进。

## TiDB

+ 功能改进
-`Update` 没有更改相应 AUTO-INCREMENT 列情况下,防止 AUTO-ID 被消耗过快 [#7846](https://github.com/pingcap/tidb/pull/7846)
+ Bug 修复
- 在 PD Leader 异常宕机的情况下,TiDB 快速创建 etcd Session 恢复服务 [#7810](https://github.com/pingcap/tidb/pull/7810)
- 修复 `DateTime` 类型使用默认值时候没有考虑时区的问题 [#7672](https://github.com/pingcap/tidb/pull/7672)
- 修复 `duplicate key update` 在某些情况下没有正确插入值的问题 [#7685](https://github.com/pingcap/tidb/pull/7685)
- 修复 `UnionScan` 中谓词条件没有下推的问题 [#7726](https://github.com/pingcap/tidb/pull/7726)
- 修复增加 `TIMESTAMP` 索引没有正确处理时区的问题 [#7812](https://github.com/pingcap/tidb/pull/7812)
- 修复某些情况下统计信息模块导致的内存泄露问题 [#7864](https://github.com/pingcap/tidb/pull/7864)
- 修复在某些异常情况下,无法获得 `ANALYZE` 结果的问题 [#7871](https://github.com/pingcap/tidb/pull/7871)
-`SYSDATE` 不做表达式展开,以返回正确的结果 [#7894](https://github.com/pingcap/tidb/pull/7894)
- 修复某些情况下,`substring_index` panic 的问题 [#7896](https://github.com/pingcap/tidb/pull/7896)
- 修复某些情况下,错误将 `OUTER JOIN` 转为 `INNER JOIN` 的问题 [#7899](https://github.com/pingcap/tidb/pull/7899)

## TiKV

+ Bug 修复
- 修复节点宕机时 Raftstore `EntryCache` 占用内存持续上升的问题 [#3529](https://github.com/tikv/tikv/pull/3529)
1 change: 1 addition & 0 deletions releases/rn.md
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TiDB 历史版本发布声明如下:

- [2.0.8](208.md)
- [2.1 RC3](21rc3.md)
- [2.1 RC2](21rc2.md)
- [2.0.7](207.md)
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