docs: add balance vgroup and redistribute vgroup

docs/en/12-taos-sql/02-database.md

@@ -154,3 +154,19 @@ TRIM DATABASE db_name;
 ```
 
 The preceding SQL statement deletes data that has expired and orders the remaining data in accordance with the storage configuration.
+
+## Redistribute Vgroup
+
+```sql
+REDISTRIBUTE VGROUP vgroup_no DNODE dnode_id1 [DNODE dnode_id2] [DNODE dnode_id3]
+```
+
+Adjust the distribution of vnodes in the vgroup according to the given list of dnodes. 
+
+## Balance Vgroup
+
+```sql
+BALANCE VGROUP
+```
+
+Automatically adjusts the distribution of vnodes in all vgroups of the cluster, which is equivalent to load balancing the data of the cluster at the vnode level.

docs/en/12-taos-sql/29-changes.md

@@ -75,7 +75,9 @@ The following data types can be used in the schema for standard tables.
 | 49 | SHOW TRANSACTIONS | Added | Shows all running transactions in the system.
 | 50 | SHOW DNODE VARIABLES | Added | Shows the configuration of the specified dnode.
 | 51 | SHOW VNODES | Not supported | Shows information about vnodes in the system. Not supported.
-| 53 | TRIM DATABASE | Added | Deletes data that has expired and orders the remaining data in accordance with the storage configuration.
+| 52 | TRIM DATABASE | Added | Deletes data that has expired and orders the remaining data in accordance with the storage configuration.
+| 53 | REDISTRIBUTE VGROUP | Added | Adjust the distribution of VNODES in VGROUP.
+| 54 | BALANCE VGROUP | Added | Auto adjust the distribution of VNODES in VGROUP.
 
 ## SQL Functions
 

docs/zh/12-taos-sql/02-database.md

@@ -154,3 +154,19 @@ TRIM DATABASE db_name;
 ```
 
 删除过期数据，并根据多级存储的配置归整数据。
+
+## 调整VGROUP中VNODE的分布
+
+```sql
+REDISTRIBUTE VGROUP vgroup_no DNODE dnode_id1 [DNODE dnode_id2] [DNODE dnode_id3]
+```
+
+按照给定的dnode列表，调整vgroup中的vnode分布。因为副本数目最大为3，所以最多输入3个dnode。
+
+## 自动调整VGROUP中VNODE的分布
+
+```sql
+BALANCE VGROUP
+```
+
+自动调整集群所有vgroup中的vnode分布，相当于在vnode级别对集群进行数据的负载均衡操作。
\ No newline at end of file

docs/zh/12-taos-sql/29-changes.md

@@ -75,7 +75,9 @@ description: "TDengine 3.0 版本的语法变更说明"
 | 49 | SHOW TRANSACTIONS | 新增 | 显示当前系统中正在执行的事务的信息。
 | 50 | SHOW DNODE VARIABLES | 新增 |显示指定DNODE的配置参数。
 | 51 | SHOW VNODES | 暂不支持 | 显示当前系统中VNODE的信息。3.0.0版本暂不支持。
-| 53 | TRIM DATABASE | 新增 | 删除过期数据，并根据多级存储的配置归整数据。
+| 52 | TRIM DATABASE | 新增 | 删除过期数据，并根据多级存储的配置归整数据。
+| 53 | REDISTRIBUTE VGROUP | 新增 | 调整VGROUP中VNODE的分布。
+| 54 | BALANCE VGROUP | 新增 | 自动调整VGROUP中VNODE的分布。
 
 ## SQL 函数变更