根据日期删除多个分区 [英] Drop multiple partitions based on date
本文介绍了根据日期删除多个分区的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个基于每日分区的表.
I have a table based on daily partitions.
我可以使用下面的查询删除一个分区
I can drop a paritition using the below query
ALTER TABLE MY_TABLE DROP PARTITION FOR(TO_DATE('19-DEC-2017','dd-MON-yyyy'))
如何在15天之前删除所有分区(多个分区)?
How can I drop all the partitions(multiple partitions) before 15days?
推荐答案
您可以像这样使用PL/SQL.
You can use PL/SQL like this.
DECLARE
CANNOT_DROP_LAST_PARTITION EXCEPTION;
PRAGMA EXCEPTION_INIT(CANNOT_DROP_LAST_PARTITION, -14758);
ts TIMESTAMP;
BEGIN
FOR aPart IN (SELECT PARTITION_NAME, HIGH_VALUE FROM USER_TAB_PARTITIONS WHERE TABLE_NAME = 'MY_TABLE') LOOP
EXECUTE IMMEDIATE 'BEGIN :ret := '||aPart.HIGH_VALUE||'; END;' USING OUT ts;
IF ts < SYSTIMESTAMP - INTERVAL '15' DAY THEN
BEGIN
EXECUTE IMMEDIATE 'ALTER TABLE MY_TABLE DROP PARTITION '||aPart.PARTITION_NAME|| ' UPDATE GLOBAL INDEXES';
EXCEPTION
WHEN CANNOT_DROP_LAST_PARTITION THEN
EXECUTE IMMEDIATE 'ALTER TABLE MY_TABLE SET INTERVAL ()';
EXECUTE IMMEDIATE 'ALTER TABLE MY_TABLE DROP PARTITION '||aPart.PARTITION_NAME;
EXECUTE IMMEDIATE 'ALTER TABLE MY_TABLE SET INTERVAL( INTERVAL ''1'' DAY )';
END;
END IF;
END LOOP;
END;
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