Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

system-variables: update for consistency #6713

Merged
merged 2 commits into from
Jul 22, 2021
Merged

system-variables: update for consistency #6713

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
398e7cc
Update system-variables.md
en-jin19 Jul 21, 2021
bf37877
added punctuation marks for consistency
en-jin19 Jul 22, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
11 changes: 7 additions & 4 deletions system-variables.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -86,9 +86,10 @@ mysql> SELECT * FROM t1;

- 作用域：SESSION | GLOBAL
- 默认值：`1000`
- 范围：`[0, 4294967295]`
- 这个变量用于控制公共表表达式的最大递归深度。

### datadir
### `datadir`

- 作用域：NONE
- 默认值：/tmp/tidb
Expand Down Expand Up @@ -148,7 +149,7 @@ mysql> SELECT * FROM t1;
- 默认值：`OFF`
- 这个变量用来显示上一个 `execute` 语句所使用的执行计划是不是直接从 plan cache 中取出来的。

### license
### `license`

- 作用域：NONE
- 默认值：Apache License 2.0
Expand Down Expand Up @@ -585,7 +586,7 @@ MPP 是 TiFlash 引擎提供的分布式计算框架，允许节点之间的数
- 默认值：`ON`
- 这个变量用来控制是否开启 statement summary 功能。如果开启，SQL 的耗时等执行信息将被记录到系统表 `information_schema.STATEMENTS_SUMMARY` 中，用于定位和排查 SQL 性能问题。

### tidb_enable_strict_double_type_check <span class="version-mark">从 v5.0 版本开始引入</span>
### `tidb_enable_strict_double_type_check` <span class="version-mark">从 v5.0 版本开始引入</span>

- 作用域：SESSION | GLOBAL
- 默认值：`ON`
Expand Down Expand Up @@ -743,6 +744,7 @@ v5.0 后，用户仍可以单独修改以上系统变量（会有废弃警告）

- 作用域：GLOBAL
- 默认值：`10m0s`
- 范围：`[10m0s, 8760h0m0s]`
- 这个变量用于指定每次进行垃圾回收 (GC) 时保留数据的时限。变量值为 Go 的 Duration 字符串格式。每次进行 GC 时，将以当前时间减去该变量的值作为 safe point。

> **Note:**
Expand All @@ -756,6 +758,7 @@ v5.0 后，用户仍可以单独修改以上系统变量（会有废弃警告）

- 作用域：GLOBAL
- 默认值：`10m0s`
- 范围：`[10m0s, 8760h0m0s]`
- 这个变量用于指定垃圾回收 (GC) 运行的时间间隔。变量值为 Go 的 Duration 字符串格式，如`"1h30m"`、`"15m"`等。

### `tidb_gc_scan_lock_mode` <span class="version-mark">从 v5.0 版本开始引入</span>
Expand Down Expand Up @@ -1370,7 +1373,7 @@ set tidb_slow_log_threshold = 200;
### `warning_count`

- 作用域: SESSION
- 默认值：0
- 默认值：`0`
- 这个只读变量表示之前执行语句中出现的警告数。

### `windowing_use_high_precision`
Expand Down