Question

在db2中删除分区后，我试图编写一个存储的proc来回收磁盘空间。

CREATE OR REPLACE PROCEDURE RECLAIM_PARTITION_SPACE(OUT RESPONSE_MESS 
VARCHAR(200))
LANGUAGE SQL
BEGIN   
DECLARE REDUCE_STOP VARCHAR(200);
DECLARE LOWER_HIGH_WATER_MARK VARCHAR(200);
DECLARE REDUCE_MAX VARCHAR(200);
DECLARE V_MSG VARCHAR(80);
DECLARE V_OUTSTATUS INTEGER DEFAULT 0;
DECLARE V_SECONDS INTEGER DEFAULT 300;

SET REDUCE_STOP = 'ALTER TABLESPACE TS_PART_TABLES REDUCE STOP';
SET LOWER_HIGH_WATER_MARK = 'ALTER TABLESPACE TS_PART_TABLES LOWER HIGH WATER MARK';
SET REDUCE_MAX = 'ALTER TABLESPACE TS_PART_TABLES REDUCE MAX';

BEGIN
    EXECUTE IMMEDIATE REDUCE_STOP;
    EXECUTE IMMEDIATE LOWER_HIGH_WATER_MARK;
END;

CALL DBMS_ALERT.WAITONE('wait for reduce max' , V_MSG , V_OUTSTATUS , V_SECONDS);

BEGIN
    EXECUTE IMMEDIATE REDUCE_STOP;
    EXECUTE IMMEDIATE REDUCE_MAX;
END;
COMMIT WORK;        
END@

GRANT EXECUTE ON PROCEDURE RECLAIM_PARTITION_SPACE(VARCHAR(200)) TO 
USER DB2INST1@

但是，当我运行此存储的proc时，没有回收，但是，当我手动运行查询ALTER TABLESPACE TS_PART_TABLES LOWER HIGH WATER MARK后跟ALTER TABLESPACE TS_PART_TABLES REDUCE MAX时，将为已删除的分区回收磁盘空间。

在存储过程中我怎么了？

Answer 1

在立即执行LOWER_HIGH_WATER_MARK和立即执行REDUCE_MAX之后添加提交解决了该问题。这是因为在使用EXECUTE IMMEDIATE时，使用DDL语句而不是DML语句执行隐式提交。（来源：https://searchoracle.techtarget.com/answer/Telling-EXECUTE-IMMEDIATE-to-commit）

通过db2上的存储过程更改表空间

1 个答案: