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Fix a wrong version mark and descrption in system-variable.md (#4843) #4869

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Merged
TomShawn merged 1 commit into from
Feb 23, 2021
Merged

Fix a wrong version mark and descrption in system-variable.md (#4843) #4869

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8 changes: 4 additions & 4 deletions system-variables.md
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Original file line number Diff line number Diff line change
Expand Up @@ -39,13 +39,13 @@ SET GLOBAL tidb_distsql_scan_concurrency = 10;

- Scope: SESSION | GLOBAL
- Default value: 1
- Controls how `AUTO_INCREMENT` values should be incremented on each allocation. It is often used in combination with `auto_increment_offset`.
- Controls the step size of `AUTO_INCREMENT` values to be allocated to a column. It is often used in combination with `auto_increment_offset`.

### auto_increment_offset

- Scope: SESSION | GLOBAL
- Default value: 1
- Controls the initial offset of `AUTO_INCREMENT` values being allocated. This setting is often used in combination with `auto_increment_increment`. For example:
- Controls the initial offset of `AUTO_INCREMENT` values to be allocated to a column. This setting is often used in combination with `auto_increment_increment`. For example:

```sql
mysql> CREATE TABLE t1 (a int not null primary key auto_increment);
Expand Down Expand Up @@ -109,7 +109,7 @@ mysql> SELECT * FROM t1;
- Default value: 28800
- This variable represents the idle timeout of the interactive user session, which is measured in seconds. Interactive user session refers to the session established by calling [`mysql_real_connect()`](https://dev.mysql.com/doc/c-api/5.7/en/mysql-real-connect.html) API using the `CLIENT_INTERACTIVE` option (for example, MySQL shell client). This variable is fully compatible with MySQL.

### last_plan_from_binding <span class="version-mark">New in v5.0.0-rc</span>
### last_plan_from_binding <span class="version-mark">New in v4.0</span>

- Scope: SESSION
- Default value: 0
Expand Down Expand Up @@ -233,7 +233,7 @@ mysql> SELECT * FROM t1;

- Scope: INSTANCE
- Default value: ON
- This variable is used to enforce that the `utf8` character set only stores values from the [Basic Multilingual Plane (BMP)](https://en.wikipedia.org/wiki/Plane_\(Unicode\)#Basic_Multilingual_Plane). To store characters outside the BMP, it is recommended to use the `utf8mb4` character set.
- This variable is used to enforce that the `utf8` character set only stores values from the [Basic Multilingual Plane (BMP)](https://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane). To store characters outside the BMP, it is recommended to use the `utf8mb4` character set.
- You might need to disable this option when upgrading your cluster from an earlier version of TiDB where the `utf8` checking was more relaxed. For details, see [FAQs After Upgrade](/faq/upgrade-faq.md).

### tidb_checksum_table_concurrency
Expand Down