背景：

SEND_CONTROL_HIS1分区表存在大量无用数据，虽不影响性能，但可以删除部分分区节省存储空间。

--查表空间有哪些对象

select owner,segment_name,segment_type,partition_name,bytes/1024/1024 As "占据空间M"

from dba_segments a where a.tablespace_name='PORT_DATA' And segment_name='CONTROL_HIS1'

Order By bytes Desc

实施步骤：

1、删除该表上半年分区

详见附表2：TRACK_PART19以前的数据分区可删除

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART4;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART5;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART6;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART7;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART8;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART9;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART10;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART11;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART12;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART13;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART14;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART15;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART16;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART17;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART18;

ALTER TABLE SEND_CONTROL_HIS1 DROP PARTITION TRACK_PART19;

2、清空该表6月份分区

详见附表2：TRACK_PART24以前的数据分区可TRUNCATE

ALTER TABLE SEND_CONTROL_HIS1 TRUNCATE PARTITION TRACK_PART20;

ALTER TABLE SEND_CONTROL_HIS1 TRUNCATE PARTITION TRACK_PART21;

ALTER TABLE SEND_CONTROL_HIS1 TRUNCATE PARTITION TRACK_PART22;

ALTER TABLE SEND_CONTROL_HIS1 TRUNCATE PARTITION TRACK_PART23;

ALTER TABLE SEND_CONTROL_HIS1 TRUNCATE PARTITION TRACK_PART24;