Monitoring the progress of a delete operation

Question

Hello All ,
I am deleting a table with 80M records based on rowid . But it appears that its running for so long .
around 12 hrs . I can see an active session with delete statement . But no entry for that session id in v$long_ops .
How can i find out the total percentage of completetion for session ? Please help me with the query
Version Ora10gR2
Thanks
Aneesh

Answer 1

Hi, if you're deleting much more than you keep i suggest you to:
- create a "twin table"
- insert the rows you want to to keep in the twin table
- truncate the original table
- re-insert the copied rows
- commit
- drop the copy table.
The truncate table is much more faster than a delete the complete table (this is a DDL operation while the Delete is a DML operation)
Sorry someoneElse i didn't see you last proposal (it's the same)
Edited by: user11268895 on Jul 10, 2010 3:19 PM
Another way to monitor this operation (if you are in PL/SQL) is to usethe dbms_Application_info package, here is an example:
DECLARE
   i   NUMBER  := 0;
   f   BOOLEAN := FALSE;
BEGIN
   WHILE NOT (f)
   LOOP
      DELETE FROM t1
            WHERE rwonum <= 20000;
      i := i + SQL%ROWCOUNT;
      DBMS_APPLICATION_INFO.set_client_info (   i
                                             || ' record have been deleted...'
      COMMIT;
      IF SQL%ROWCOUNT < 20000
      THEN
         f := TRUE;
      END IF;
   END LOOP;
END;then you'll be able to see how many rows were deleted at "any" time:
SELECT client_info,v.*
  FROM SYS.v_$session vEdited by: user11268895 on Jul 10, 2010 3:20 PM