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br: add a waring about multi br importing #6890

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Aug 25, 2021
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br: add a waring about multi br importing #6890

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br: add a waring about multi br importing
YuJuncen Aug 18, 2021
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br: added a warning in the main doc
YuJuncen Aug 19, 2021
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YuJuncen Aug 19, 2021
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br: added unit for br
YuJuncen Aug 19, 2021
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Update br/use-br-command-line-tool.md
YuJuncen Aug 19, 2021
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YuJuncen Aug 24, 2021
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Update br/use-br-command-line-tool.md
TomShawn Aug 25, 2021
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8 changes: 8 additions & 0 deletions br/backup-and-restore-faq.md
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Expand Up @@ -170,3 +170,11 @@ BR 不会备份统计信息（v4.0.9 除外）。所以在恢复存档后需要
BR v4.0.9 备份统计信息使 BR 消耗过多内存，为保证备份过程正常，从 v4.0.10 开始默认关闭备份统计信息的功能。

如果不对表执行 `ANALYZE`，TiDB 会因统计信息不准确而选不中最优化的执行计划。如果查询性能不是重点关注项，可以忽略 `ANALYZE`。

# 是否可以同时启动多个 BR 对单个集群进行恢复？
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这里的 BR 是否有单位呢？集群，实例，节点，还是其他单位呢？

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# 是否可以同时启动多个 BR 对单个集群进行恢复？
## 是否可以同时启动多个 BR 对单个集群进行恢复？

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@YuJuncen cc

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换成了“BR 命令”，用来指代 BR CLI。


**强烈不建议**在单个集群中同时使用多个 BR 进行恢复，原因如下：

1. BR 在恢复时，会修改 PD 的一些全局配置。在多个 BR 同时进行恢复的时候，这些配置可能会被错误地覆写，导致集群状态异常。
2. 同时，因为 BR 在恢复的时候会占用大量集群资源，事实上并行恢复能获得的速度提升也非常有限。
3. 多个 BR 并行恢复的场景没有经过测试，无法保证成功。
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