From 340f21aa3522f74ecb95a45627add4f1c64f6acf Mon Sep 17 00:00:00 2001
From: TomShawn <41534398+TomShawn@users.noreply.github.com>
Date: Fri, 19 Feb 2021 12:02:36 +0800
Subject: [PATCH 1/3] Fix a wrong version mark in system-variable.md
---
system-variables.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/system-variables.md b/system-variables.md
index 82e01a146a4d2..a88aee12c485f 100644
--- a/system-variables.md
+++ b/system-variables.md
@@ -110,7 +110,7 @@ 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 New in v5.0.0-rc
+### last_plan_from_binding New in v4.0
- Scope: SESSION
- Default value: 0
From a6e43339858f5b960c369ccd9db2644040231d1b Mon Sep 17 00:00:00 2001
From: TomShawn <41534398+TomShawn@users.noreply.github.com>
Date: Fri, 19 Feb 2021 13:13:17 +0800
Subject: [PATCH 2/3] fix a broken external link
---
system-variables.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/system-variables.md b/system-variables.md
index a88aee12c485f..4f3334f008328 100644
--- a/system-variables.md
+++ b/system-variables.md
@@ -234,7 +234,7 @@ 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
From 0b609cb64f0cdca990dd8ae21297aeeb004c9604 Mon Sep 17 00:00:00 2001
From: TomShawn <41534398+TomShawn@users.noreply.github.com>
Date: Fri, 19 Feb 2021 15:09:20 +0800
Subject: [PATCH 3/3] fix description
---
system-variables.md | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/system-variables.md b/system-variables.md
index 4f3334f008328..d102958e3f87d 100644
--- a/system-variables.md
+++ b/system-variables.md
@@ -40,13 +40,13 @@ 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);