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Merge pull request #798 from lilin90/release-205
releases, readme: add the release notes for 2.0.5
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title: TiDB 2.0.5 release notes | ||
category: Releases | ||
--- | ||
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# TiDB 2.0.5 Release Notes | ||
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2018 年 7 月 6 日,TiDB 发布 2.0.5 版。该版本在 2.0.4 版的基础上,对系统兼容性、稳定性做出了改进。 | ||
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## TiDB | ||
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- New Features | ||
- 增加一个系统变量 `tidb_disable_txn_auto_retry`,用于关闭事务自动重试 [#6877](https://github.com/pingcap/tidb/pull/6877) | ||
- Improvements | ||
- 调整计算 `Selection` 代价的方式,结果更准确 [#6989](https://github.com/pingcap/tidb/pull/6989) | ||
- 查询条件能够完全匹配唯一索引或者主键时,直接选择作为查询路径 [#6966](https://github.com/pingcap/tidb/pull/6966) | ||
- 启动服务失败时,做必要的清理工作 [#6964](https://github.com/pingcap/tidb/pull/6964) | ||
- 在 `Load Data` 语句中,将 `\N` 处理为 NULL [#6962](https://github.com/pingcap/tidb/pull/6962) | ||
- 优化 CBO 代码结构 [#6953](https://github.com/pingcap/tidb/pull/6953) | ||
- 启动服务时,尽早上报监控数据 [#6931](https://github.com/pingcap/tidb/pull/6931) | ||
- 对慢查询日志格式进行优化:去除 SQL 语句中的换行符,增加用户信息 [#6920](https://github.com/pingcap/tidb/pull/6920) | ||
- 支持注释中存在多个星号的情况 [#6858](https://github.com/pingcap/tidb/pull/6858) | ||
- Bug Fixes | ||
- 修复 `KILL QUERY` 语句权限检查问题 [#7003](https://github.com/pingcap/tidb/pull/7003) | ||
- 修复用户数量超过 1024 时可能造成无法登陆的问题 [#6986](https://github.com/pingcap/tidb/pull/6986) | ||
- 修复一个写入无符号类型 `float`/`double` 数据的问题 [#6940](https://github.com/pingcap/tidb/pull/6940) | ||
- 修复 `COM_FIELD_LIST` 命令的兼容性,解决部分 MariaDB 客户端遇到 Panic 的问题 [#6929](https://github.com/pingcap/tidb/pull/6929) | ||
- 修复 `CREATE TABLE IF NOT EXISTS LIKE` 行为 [#6928](https://github.com/pingcap/tidb/pull/6928) | ||
- 修复一个 TopN 下推过程中的问题 [#6923](https://github.com/pingcap/tidb/pull/6923) | ||
- 修复 `Add Index` 过程中遇到错误时当前处理的行 ID 记录问题 [#6903](https://github.com/pingcap/tidb/pull/6903) | ||
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## PD | ||
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- 修复某些场景下副本迁移导致 TiKV 磁盘空间耗尽的问题 | ||
- 修复 `AdjacentRegionScheduler` 导致的崩溃问题 | ||
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## TiKV | ||
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- 修复 decimal 运算中潜在的溢出问题 | ||
- 修复 merge 过程中可能发生的脏读问题 |
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