oracle中add&split partition對global&local index的影響,oracleadd
生產庫中某些大表的分區異常,需要對現有表進行線上操作,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,建立分區表:
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 p3 values less than(16),
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,再建立一個不帶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 p2 values less than(11),
partition p3 values less than(16));
然後,建立local索引:
create index idx_tp2_c2 on tp2(c2) local;
因為主鍵就是個global索引,所以,不需要另外建立global index,我們insert資料:
insert into tp2 vlaues(1,'aaa','aaa');
insert into tp2 vlaues(2,'aaa','aaa');
insert into tp2 vlaues(3,'aaa','aaa');
insert into tp2 vlaues(4,'aaa','aaa');
insert into tp2 vlaues(5,'aaa','aaa');
insert into tp2 vlaues(6,'aaa','aaa');
insert into tp2 vlaues(7,'aaa','aaa');
insert into tp2 vlaues(8,'aaa','aaa');
insert into tp2 vlaues(9,'aaa','aaa');
insert into tp2 vlaues(10,'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,而且,add partition對global和local索引均無影響;
那麼,split partition:
ALTER TABLE tp2 SPLIT PARTITION p2 AT (8) INTO (PARTITION p2, PARTITION p22) ;
發現split分區會導致golbal索引失效,而local索引正常,為split分區命令添加update indexes選項後,再split分區對global&local索引均無影響:
ALTER TABLE tp2 SPLIT PARTITION p1 AT (3) INTO (PARTITION p1, PARTITION p11) update indexes;
以上為測試結果,記錄於此,以便今後其他同學和自己參考。