Script for automation.

Question

Rhel 5.
11.2.0.3
Any body have idea how to write a scripts to fullfill below requirments.
script 1) Change Partition name and subpartition name ( Range Hash). First List and then change.
script 2) Estimate Size and then purge data of selected partition by exchanging into a separate table.
any help will be highly appreciated!!
My workaround is
*1) script 1*
i) partition and sub partition listening.
select table_name, PARTITION_NAME,TABLESPACE_NAME from user_tab_partitions where table_name='XXXX';
select partition_name,TABLESPACE_NAME from user_segments where segment_name='XXXX';
partition and subparition renaming
ii) partition and sub parition renaming.
alter table <tablename> rename partition <old parition name> to <new parition name>;
ALTER TABLE <tablename> RENAME SUBPARTITION <old-partition-name> TO <new-partition-name>;
*2) scrpit 2*
I) Estimate size of sub parition
select substr(partition_name,1,7) p_name,sum(bytes)/1024/1024 "MB" from user_segments where segment_name='INFO' group by substr(partition_name,1,7);
ii) Exchange parition.
a) create a table with sub parition type i.e hash parition table
b) create new table rang hash.
c) first exchange partition with sub partition type table than exchange sub partition type table with new rang hash partition.
alter table <old range hash table> exchange partition <partition name> with table <sub type hash table>;
alter table <sub type hash table> exchange partition <partition name> with table <new range hash table>;
Now my question is how can i read partition and sub parition names in script and than rename and exchange it dynamically??.
Edited by: Kh$n on Apr 25, 2013 5:20 AM

Answer 1

1) day wise not month wise.what? dont understand sorry, plase elaborate it.
2) i dn.t want to truncate it directly before truncating i want to save that data to another table thats why am exchanging it.with an example:
SQL> CREATE TABLE my_table
  2  (id  NUMBER(5),
  3  name VARCHAR2(30),
  4  mydate    DATE)
  5  PARTITION BY RANGE(mydate)
  6  (
  7  PARTITION january2013 VALUES LESS THAN(TO_DATE('01/02/2013','DD/MM/YYYY')),
  8  PARTITION february2013 VALUES LESS THAN(TO_DATE('01/03/2013','DD/MM/YYYY')),
  9  PARTITION march2013 VALUES LESS THAN(TO_DATE('01/04/2013','DD/MM/YYYY')),
10  PARTITION april2013 VALUES LESS THAN(TO_DATE('01/05/2013','DD/MM/YYYY'))
11  );
Tabla creada.
SQL> insert into my_table values (1, 'Fran', '01/01/2013');
1 fila creada.
SQL> insert into my_table values (1, 'Mike', '11/02/2013');
1 fila creada.
SQL> insert into my_table values (1, 'Donald', '11/03/2013');
1 fila creada.
SQL> insert into my_table values (1, 'Anna', '11/03/2011');
1 fila creada.
SQL> commit;
Confirmaci¾n terminada.
SQL>
SQL> select * from my_table;
        ID NAME                           MYDATE
         1 Fran                           01/01/13
         1 Anna                           11/03/11
         1 Mike                           11/02/13
         1 Donald                         11/03/13
SQL> create table my_new_table(id number(5), name varchar2(30), my_date date);
Tabla creada.
SQL> select * from my_new_table;
ninguna fila seleccionada
SQL> ALTER TABLE my_table
  2  EXCHANGE PARTITION march2013
  3  WITH TABLE my_new_table;
Tabla modificada.
SQL> select * from my_new_table;
        ID NAME                           MY_DATE
         1 Donald                         11/03/13
SQL> select * from my_table;
        ID NAME                           MYDATE
         1 Fran                           01/01/13
         1 Anna                           11/03/11
         1 Mike                           11/02/13With this you directly exchange data from partition to a table, don't need to purge the partition.