119 lines
3.3 KiB
Markdown
119 lines
3.3 KiB
Markdown
ALTER TABLEGROUP
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=====================================
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描述
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-----------
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该语句用来执行以下操作：
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* 对一个表组增加多张表。
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* 修改表组的分区规则。
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* 修改表组的 locality 和 primary zone。
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格式
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-----------
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* 对一个表组增加多张表。
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```javascript
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ALTER TABLEGROUP tablegroupname ADD [TABLE] tblname [, tblname...]
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```
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* 修改表组的分区规则。
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```javascript
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ALTER TABLEGROUP tablegroupname alter_tg_partition_option
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alter_tg_partition_option:
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DROP PARTITION '(' name_list ')'
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| ADD PARTITION opt_range_partition_list
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| modify_tg_partition_info
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```
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* 修改表组的 locality 和 primary zone。
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```javascript
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ALTER TABLEGROUP tablegroupname alter_tablegroup_actions
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alter_tablegroup_actions:
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alter_tablegroup_action
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| alter_tablegroup_action, alter_tablegroup_action
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alter_tablegroup_action:
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SET LOCALITY [=] locality_name
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|SET PRIMARY_ZONE [=] primary_zone_name
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```
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参数解释
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-------------
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| **参数** | **描述** |
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|--------------------------------|--------------------------------------------------------------------------------------------------------------------------|
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| tablegroupname | 指定表组。 |
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| tblname | 表名。对一个表组增加多张表时，表与表之间以逗号（'，'）分隔。 当添加多个表时，允许表名重复。如果待添加的表已经属于 *tablegroupname* 的表格组，系统不报错。 |
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| modify_tg_partition_info | 修改表组的分区规则。 |
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| LOCALITY locality_name | 指定表组的 locality。 |
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| PRIMARY_ZONE primary_zone_name | 指定表组的主Zone。 |
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示例
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-----------
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创建表组 tgh 和两张关系表 ttgh 和 ttgh2 ，并将表组的 locality 修改为 F@z1。
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```javascript
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OceanBase(admin@test)> create tablegroup tgh locality='F,R{ALL_SERVER}@z1' partition by hash partitions 10;
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Query OK, 0 rows affected (0.09 sec)
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OceanBase(admin@test)> create table ttgh(c1 int, c2 int) tablegroup = tgh locality='F,R{ALL_SERVER}@z1';
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Query OK, 0 rows affected (0.55 sec)
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OceanBase(admin@test)> create table ttgh2(c1 int, c2 int) tablegroup = tgh locality='F,R{ALL_SERVER}@z1';
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Query OK, 0 rows affected (0.39 sec)
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OceanBase(admin@test)> alter tablegroup tgh set locality ='F@z1';
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Query OK, 0 rows affected (0.09 sec)
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OceanBase(admin@test)> select locality from oceanbase.__all_tablegroup where tablegroup_name ='tgh';
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+------------+
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| locality |
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+------------+
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| FULL{1}@z1 |
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+------------+
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1 row in set (0.05 sec)
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OceanBase(admin@test)> select locality from oceanbase.__all_table where tablegroup_id=(select tablegroup_id from oceanbase.__all_tablegroup where tablegroup_name ='tgh');
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+------------+
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| locality |
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+------------+
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| FULL{1}@z1 |
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| FULL{1}@z1 |
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+------------+
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2 rows in set (0.04 sec)
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```
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