Droping Partition Dynamically in Interval Partitioning

Question

Hi All,
I have created an Interval Partition Table as show below, Is their any way, i can drop the partition dynamically when i truncate the table as oracle creates them with system generated name? Instead Alter table drop partition !
Create Table Script :
CREATE TABLE TBL_EMP_SALES
EMP_ID NUMBER(38),
EMPNAME VARCHAR2(9),
EMP_SALES_AMOUNT NUMBER(5),
EMP_SALES_DATE DATE,
CONSTRAINT PK_EMP_03 PRIMARY KEY (EMP_ID) USING INDEX TABLESPACE EMP_TABLESPACE
) NOLOGGING PARALLEL 4 TABLESPACE EMP_TABLESPACE
PARTITION BY RANGE(EMP_SALES_DATE)
INTERVAL (numtodsinterval(1,'day'))
STORE IN (EMP_TABLESPACE)
PARTITION P0 VALUES LESS THAN (to_date('23-AUG-2012','DD-MON-YYYY')) NOLOGGING
Insert Script :
INSERT INTO TBL_EMP_SALES VALUES (1001,'A',50,SYSDATE);
INSERT INTO TBL_EMP_SALES VALUES (1002,'B',100,SYSDATE+1);
INSERT INTO TBL_EMP_SALES VALUES (1003,'C',80,SYSDATE+2);
INSERT INTO TBL_EMP_SALES VALUES (1004,'D',250,SYSDATE+3);
INSERT INTO TBL_EMP_SALES VALUES (1005,'E',50,SYSDATE+4);
INSERT INTO TBL_EMP_SALES VALUES (1006,'F',50,SYSDATE+5);
INSERT INTO TBL_EMP_SALES VALUES (1007,'G',340,SYSDATE+6);
INSERT INTO TBL_EMP_SALES VALUES (1008,'H',120,SYSDATE+7);
COMMIT;
Partitions Created :
select segment_name,partition_name,bytes from user_segments where segment_name = 'TBL_EMP_SALES';
segment_name partition_name bytes
TBL_EMP_SALES     P0     8388608
TBL_EMP_SALES     SYS_P602     8388608
TBL_EMP_SALES     SYS_P603     8388608
TBL_EMP_SALES     SYS_P604     8388608
TBL_EMP_SALES     SYS_P605     8388608
TBL_EMP_SALES     SYS_P606     8388608
TBL_EMP_SALES     SYS_P607     8388608
TBL_EMP_SALES     SYS_P608     8388608
Thanks,
Varun
Edited by: 900575 on Aug 22, 2012 1:18 AM

Answer 1

Hi Kev82Fr,
Thanks for the useful post, I have tried your after trigger concept it works well and i have modified the code as below. Is their any other way where i can drop all the partition in the table in one shot ?
--------------------------------------Drop Partition Procedure--------------------------------
create or replace
PROCEDURE USP_PARTITION_DROP_TEST
AS
lv_cmd VARCHAR2(2000);
CURSOR parition_names IS
SELECT partition_name FROM user_segments WHERE segment_name = 'TBL_EMP_SALES';
parition_record parition_names%ROWTYPE;
BEGIN
OPEN parition_names;
LOOP
FETCH parition_names INTO parition_record;
EXIT WHEN parition_names%NOTFOUND;
SELECT 'ALTER TABLE TBL_EMP_SALES DROP PARTITION '||parition_record INTO lv_cmd FROM DUAL;
EXECUTE IMMEDIATE lv_cmd;
END LOOP;
CLOSE parition_names;
END USP_PARTITION_DROP_TEST;
---------------- After Truncate Trigger-----------------------------------
CREATE OR REPLACE TRIGGER TRG_PARTITION_DROP
after truncate on <SCHEMA NAME>.SCHEMA
BEGIN
USP_PARTITION_DROP_TEST();
END;
Thanks,
Varun