From f9797d6556b189e4f3c3d60cfc5557f5044743d8 Mon Sep 17 00:00:00 2001
From: travelliu <bin.liu@enmotech.com>
Date: Thu, 7 Nov 2024 15:50:22 +0800
Subject: [PATCH] update(MTK): add mig mysql auto_increment to mogdb desc

---
 .../v2.0/faq/mtk-mysql-to-openGauss.md        | 33 +++++++++++++++++++
 .../v2.0/faq/mtk-mysql-to-openGauss.md        | 33 +++++++++++++++++++
 2 files changed, 66 insertions(+)

diff --git a/product/en/docs-mtk/v2.0/faq/mtk-mysql-to-openGauss.md b/product/en/docs-mtk/v2.0/faq/mtk-mysql-to-openGauss.md
index 88f1e231..ce02140e 100644
--- a/product/en/docs-mtk/v2.0/faq/mtk-mysql-to-openGauss.md
+++ b/product/en/docs-mtk/v2.0/faq/mtk-mysql-to-openGauss.md
@@ -75,6 +75,39 @@ select schema_name,default_character_set_name,DEFAULT_COLLATION_NAME from inform
 > MTK does not migrate the COLLATE attribute for the time being. Manual intervention is required to confirm and create the schema.
 > Whether migration will be considered in later versions is to be determined.
 
+### Sequence/Auto_increment
+
+MySQL does not have sequences. Migrate to target-side sequences when column attribute `auto_increment` is not supported.
+
+- Auto_increment is not supported
+
+  - Compatibility mode is not B mode.
+  - Compatibility mode B mode does not install plugin `dolphin`
+  - Compatibility mode B mode and plugin `dolphin` is installed, database version is less than 3.1.0
+
+  ```sql
+  - Create sequence
+  create sequence sequence_name;
+  - Specify column default value as sequence next
+  create table table(col col_type default nextval('sequence_name'));
+  - Modify sequence owner
+  alter sequence sequence_name owned owner.table_name.column_name
+  - Modify sequence last value
+  select setval('',last_number);
+  ```
+
+- Auto_increment is supported
+
+  Compatibility mode B mode and plugin `dolphin` is installed, database version is greater than 3.1.0
+
+  ```sql
+  - Do not create sequence
+  - Specify column attribute auto_increment
+  create table table(col col_type auto_increment);
+  --Modify the last value of the sequence
+  alter table owner.table_name auto_increment=last_number
+  ```
+
 ### Table
 
 - rewrite the `auto-increment` column as the default sequence
diff --git a/product/zh/docs-mtk/v2.0/faq/mtk-mysql-to-openGauss.md b/product/zh/docs-mtk/v2.0/faq/mtk-mysql-to-openGauss.md
index 23cc10a2..53cb8ee5 100644
--- a/product/zh/docs-mtk/v2.0/faq/mtk-mysql-to-openGauss.md
+++ b/product/zh/docs-mtk/v2.0/faq/mtk-mysql-to-openGauss.md
@@ -65,6 +65,39 @@ select schema_name,default_character_set_name,DEFAULT_COLLATION_NAME from inform
 > MTK 暂时不迁移COLLATE属性,需要人工介入确定好,创建schema
 > 后面版本会不会考虑迁移待定
 
+### 序列/自增列
+
+MySQL 没有序列. 在不支持列属性 `auto_increment` 的情况下迁移为目标端序列.
+
+- 不支持  auto_increment
+
+  - 兼容模式非B模式.
+  - 兼容模式B模式未安装插件`dolphin`
+  - 兼容模式B模式并且安装插件`dolphin`，数据库版本小于于3.1.0
+
+  ```sql
+  -- 创建序列
+  create sequence sequence_name;
+  -- 指定列默认值为序列next
+  create table table(col col_type default nextval('sequence_name'));
+  -- 修改序列所属者
+  alter sequence sequence_name owned owner.table_name.column_name
+  -- 修改序列最后值
+  select setval('',last_number);
+  ```
+
+- 支持 auto_increment
+
+  兼容模式B模式并且安装插件`dolphin`,数据库版本大于3.1.0
+
+  ```sql
+  -- 不创建序列
+  -- 指定列属性 auto_increment
+  create table table(col col_type auto_increment);
+  -- 修改序列最后值
+  alter table owner.table_name auto_increment=last_number
+  ```
+
 ### 表
 
 - 自增列改写为默认值序列
-- 
Gitee