在线表格重定义研究,比如将普通表转换为分区表等

Drop table t;
CREATE TABLE T (ID NUMBER PRIMARY KEY, TIME DATE);
INSERT INTO T
SELECT ROWNUM, SYSDATE - ROWNUM FROM DBA_OBJECTS WHERE ROWNUM <= 5000;
COMMIT;

EXEC DBMS_REDEFINITION.CAN_REDEF_TABLE(USER, 'T');

PL/SQL 过程已成功完成。

CREATE TABLE T_NEW (ID NUMBER PRIMARY KEY, TIME DATE) PARTITION BY RANGE (TIME)
(PARTITION P1 VALUES LESS THAN (TO_DATE('2004-7-1', 'YYYY-MM-DD')),
PARTITION P2 VALUES LESS THAN (TO_DATE('2005-1-1', 'YYYY-MM-DD')),
PARTITION P3 VALUES LESS THAN (TO_DATE('2005-7-1', 'YYYY-MM-DD')),
PARTITION P4 VALUES LESS THAN (MAXVALUE));
表已创建。

EXEC DBMS_REDEFINITION.START_REDEF_TABLE(USER, 'T', 'T_NEW');

PL/SQL 过程已成功完成。

EXEC DBMS_REDEFINITION.FINISH_REDEF_TABLE(USER, 'T', 'T_NEW');

PL/SQL 过程已成功完成。

SELECT COUNT(*) FROM T;

COUNT(*)
----------
5000

SELECT COUNT(*) FROM T PARTITION (P3);

COUNT(*)
----------
1096