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Merged
ti-srebot merged 12 commits into from
Sep 27, 2020
Merged

system-variables: update noop functions #4588

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system-variables: update noop functions
Joyinqin Sep 24, 2020
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Merge remote-tracking branch 'upstream/master' into update-noop-funct…
Joyinqin Sep 24, 2020
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Update system-variables.md
Joyinqin Sep 24, 2020
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improve language
Joyinqin Sep 24, 2020
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Update system-variables.md
Joyinqin Sep 24, 2020
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Merge branch 'master' into update-noop-functions
Joyinqin Sep 24, 2020
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Joyinqin Sep 25, 2020
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Merge branch 'master' into update-noop-functions
Joyinqin Sep 25, 2020
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Joyinqin Sep 25, 2020
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Update system-variables.md
TomShawn Sep 25, 2020
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Joyinqin Sep 25, 2020
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Merge branch 'master' into update-noop-functions
TomShawn Sep 27, 2020
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4 changes: 2 additions & 2 deletions system-variables.md
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Expand Up @@ -349,8 +349,8 @@ SET GLOBAL tidb_distsql_scan_concurrency = 10;

- 作用域：SESSION | GLOBAL
- 默认值: 0
- 默认情况下，当你尝试将语法用于尚未实现的功能，TiDB 会报错。设置变量值为 `1`，TiDB 则自动忽略此类功能不可用的情况，这在无法更改 SQL 代码时很有效。
- 启用 `noop` 功能可以控制以下行为：
- 默认情况下，用户尝试将某些语法用于尚未实现的功能时，TiDB 会报错。若将该变量值为 `1`，TiDB 则自动忽略此类功能不可用的情况，即不会报错。若用户无法更改 SQL 代码，可考虑将变量值设为 `1`。
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- 启用 `noop` 函数可以控制以下行为：
* `get_lock` 和 `release_lock` 函数
* `LOCK IN SHARE MODE` 语法
* `SQL_CALC_FOUND_ROWS` 语法
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