oracle partition by list,深入解析partition-list 分区

删除分区：alter table[tablename] drop partition[ptname];

删除子分区：alter table[tablename] drop subpartition[ptname];

例：

--删除default分区

SQL> alter table t_partition_list drop partition t_list_default;

表已更改。

SQL> select partition_name,high_value,tablespace_name from user_tab_partitions

2 where table_name='T_PARTITION_LIST';

PARTITION_NAME HIGH_VALUE TABLESPACE_NAME

------------------------------ ---------------------------------------------------------------------

T_LIST_P1 1, 3, 5, 7, 9 TBS01

T_LIST_P2 2, 4, 6, 8, 10 TBS02

T_LIST_P3 21, 23, 25, 27, 29 TBS03

T_LIST_P4 20, 22, 24 TBS03

--添加default分区

SQL> alter table t_partition_list add partition t_list_default values(default) tablespace tbs03;

表已更改。

3.4、合并表分区(merge partitions)

语法： alter table tbname merge partitions/subpartitions pt1,pt2 into partition/subpartition pt3;

例：

SQL> select partition_name,high_value,tablespace_name from user_tab_partitions

2 where table_name='T_PARTITION_LIST';

PARTITION_NAME HIGH_VALUE TABLESPACE_NAME

------------------------------ ---------------------------------------------------------------------

T_LIST_DEFAULT default TBS03

T_LIST_P1 1, 3, 5, 7, 9 TBS01

T_LIST_P2 2, 4, 6, 8, 10 TBS02

T_LIST_P3 21, 23, 25, 27, 29 TBS03

T_LIST_P4 20, 22, 24 TBS03

SQL> alter table t_partition_list merge partitions t_list_p4,t_list_default into partition t_list_de fault;

表已更改。

SQL> select partition_name,high_value,tablespace_name from user_tab_partitions

2 where table_name='T_PARTITION_LIST';

PARTITION_NAME HIGH_VALUE TABLESPACE_NAME

------------------------------ ---------------------------------------------------------------------

T_LIST_DEFAULT default JJJG

T_LIST_P1 1, 3, 5, 7, 9 TBS01

T_LIST_P2