*: add slow-query doc #849
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yikeke
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Aug 22, 2018
op-guide/tidb-config-file.md
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| + 慢查询日志的文件名。 | ||
| + 默认: "" | ||
| + 设置后，慢查询日志单独会输出到该文件。 |
yikeke
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Aug 22, 2018
sql/slow-query.md
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| # 慢查询日志 | ||
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| 一个不合理的 SQL 语句会导致整个集群压力增大，响应变慢。对于这种问题，我们需要用慢查询日志来定位有问题的语句，解决性能问题。 |
yikeke
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Aug 22, 2018
sql/slow-query.md
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| ### 获取 | ||
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| 通过在 TiDB 的日志文件上 grep SLOW_QUERY 这个关键字, 可以得到执行时间超过 [slow-threshold](../op-guide/tidb-config-file.md#slow-threshold) 的语句日志。 |
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SLOW_QUERY -> SLOW_QUERY
关键字, -> 关键字，(Please change the English comma to the Chinese comma.)
yikeke
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Aug 22, 2018
sql/slow-query.md
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| 一个不合理的 SQL 语句会导致整个集群压力增大，响应变慢。对于这种问题，我们需要用慢查询日志来定位有问题的语句，解决性能问题。 | ||
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| ### 获取 |
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Add more details in this heading:
获取 -> 获取日志
yikeke
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Aug 22, 2018
sql/slow-query.md
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| #### backoff_time | ||
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| 表示语句遇到需要重试的错误，在重试前等待的时间，有很多种可能，常见的原因有遇到了 lock，region 分裂, |
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- region -> Region
- In a Chinese text, use a Chinese back-sloping comma (顿号) to separate items in a list:
lock，region 分裂, -> lock、Region 分裂、 - Rewrite advice: 表示语句遇到需要重试的错误时在重试前等待的时间，遇到错误有几种常见的原因：lock、Region 分裂和 tikv server is busy 等。
yikeke
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Aug 22, 2018
sql/slow-query.md
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| #### cost_time | ||
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| 表示执行这个语句花费的时间。只有执行时间超过 slow-threshold |
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There are some redundant line breaks (换行符) in this document, please remove them.
sql/slow-query.md
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| #### succ | ||
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| 请求是否执行成功 |
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Keep consistent with the above descriptions below headings:
请求是否执行成功 -> 表示请求是否执行成功。
sql/slow-query.md
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| #### con | ||
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| connection ID，即 session ID, 可以用类似 `con:3 ` 的关键字在日志中 grep 出 session ID 为 3 的日志。 |
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Please add "表示" at the beginning of every description sentences below and add the period (句号) if needed.
yikeke
reviewed
Aug 22, 2018
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@yikeke |
yikeke
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Aug 27, 2018
IzabelWang
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Mar 28, 2019
via: pingcap/docs pingcap#849
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