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tools: update some description about tidb-binlog and sync-diff-inspector (#4040) #4043

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Jul 24, 2020
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tools: update some description about tidb-binlog and sync-diff-inspector (#4040) #4043

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2 changes: 1 addition & 1 deletion sync-diff-inspector/sync-diff-inspector-overview.md
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Expand Up @@ -23,7 +23,7 @@ GitHub 地址：[sync-diff-inspector](https://github.com/pingcap/tidb-tools/tree

### 使用限制

* 目前不支持在线校验，需要保证上下游校验的表中没有数据写入，或者保证某个范围内的数据不再变更，通过配置 `range` 来校验这个范围内的数据。
* 对于 MySQL 和 TiDB 之间的数据同步不支持在线校验，需要保证上下游校验的表中没有数据写入，或者保证某个范围内的数据不再变更，通过配置 `range` 来校验这个范围内的数据。

* 不支持 JSON、BIT、BINARY、BLOB 等类型的数据，在校验时需要设置 `ignore-columns` 忽略检查这些类型的数据。

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4 changes: 4 additions & 0 deletions tidb-binlog/tidb-binlog-faq.md
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Expand Up @@ -13,6 +13,10 @@ aliases: ['/docs-cn/v3.1/reference/tidb-binlog/faq/']

- 对于有写入或更新数据的事务有一点性能影响。延迟上，在 Prewrite 阶段要并发写一条 p-binlog 成功后才可以提交事务，一般写 binlog 比 KV Prewrite 快，所以不会增加延迟。可以在 Pump 的监控面板看到写 binlog 的响应时间。

## TiDB Binlog 的同步延迟一般为多少？

TiDB Binlog 的同步延迟为秒级别，在非业务高峰时延迟一般为 3 秒左右。

## Drainer 同步下游 TiDB/MySQL 的帐号需要哪些权限？

Drainer 同步帐号需要有如下权限：
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