oracle11.2中分區功能測試之add&split partition對global&local index的影響
生產庫中某些大表的分區異常,需要對現有表進行在線操作,以添加丟失分區,因為是生產庫,還是謹慎點好,今天有空,針對add&split分區對global&local索引的影響進行了測試,測試版本為oracle11.2.0.4,過程如下:
首先,創建分區表:
CREATE TABLE TP1
(
C1 INT PRIMARY KEY,
C2 VARCHAR2(10),
C3 CHAR(10)
)
partition by range (c1)
(
partition p1 values less than(6),
partition p2 values less than(11),
partition maxvalue values less than(maxvalue));
但在add partition時遇到了問題,報錯如下:
ORA-14074: 分區界限必須調整為高於最後一個分區界限
根本原因是存在最後maxvalue分區,於是,再創建一個不帶maxvalue的分區表:
CREATE TABLE TP2
(
C1 INT PRIMARY KEY,
C2 VARCHAR2(10),
C3 CHAR(10)
)
partition by range (c1)
(
partition p1 values less than(6),
partition p3 values less than(16));
然後,創建local索引:
create index idx_tp2_c2 on tp2(c2) local;
因為主鍵就是個global索引,所以,不需要另外創建global index,我們insert數據:
insert into tp2 values(1,‘aaa‘,‘aaa‘);
insert into tp2 values(2,‘aaa‘,‘aaa‘);
insert into tp2 values(3,‘aaa‘,‘aaa‘);
insert into tp2 values(5,‘aaa‘,‘aaa‘);
insert into tp2 values(6,‘aaa‘,‘aaa‘);
insert into tp2 values(7,‘aaa‘,‘aaa‘);
insert into tp2 values(8,‘aaa‘,‘aaa‘);
insert into tp2 values(9,‘aaa‘,‘aaa‘);
insert into tp2 values(10,‘aaa‘,‘aaa‘);
insert into tp2 values(11,‘aaa‘,‘aaa‘);
insert into tp2 values(12,‘aaa‘,‘aaa‘);
insert into tp2 values(13,‘aaa‘,‘aaa‘);
insert into tp2 values(14,‘aaa‘,‘aaa‘);
insert into tp2 values(15,‘aaa‘,‘aaa‘);
commit;
我們add partition:
ALTER TABLE tp2 add PARTITION p10 values less than(51);
add partition成功,因為不存在maxvalue分區。檢查主鍵和索引:
select index_name,status from user_indexes where table_name=‘TP2‘;
select index_name,partition_name,status from user_ind_partitions where index_name=‘IDX_TP2_C2‘ order by partition_name;
經檢查,add partition對global和local索引均無影響,如下圖:
那麽,split partition:
ALTER TABLE tp2 SPLIT PARTITION p1 AT (3) INTO (PARTITION p1, PARTITION p13);
發現split分區會導致golbal索引不可用,而local索引的相應分區也不可用,如下圖:
重建主鍵索引:
ALTER INDEX SYS_C0027745 REBUILD ONLINE;
重建主鍵索引後,global索引及local索引狀態如下:
為split分區命令添加update indexes選項:
ALTER TABLE tp2 SPLIT PARTITION p2 AT (8) INTO (PARTITION p2, PARTITION p28) update indexes;
檢查本次split分區對global&local索引均無影響,如下圖:
rebuild local索引不可用的分區:
alter index idx_tp2_c2 rebuild partition p1 online;
alter index idx_tp2_c2 rebuild partition p13 online;
檢查local索引狀態如下:
以上為測試過程和結果,記錄於此,以便今後其他同學和自己參考。
oracle11.2中分區功能測試之add&split partition對global&local index的影響