Hi Raj
RTFM is a relational trace file management system. Originally released as
an add-on with 8.0.0.6, I think it now comes standard with 9i.
Cheers
Greg
-----Original Message-----
Sent: Monday, 25 June 2001 09:52
To: Greg Solomon
Greg
I'm curious.. Whats RTFM is??
Raj
-----Original Message-----
Sent: 22 June 2001 17:04
To: LazyDBA.com Discussion
Hi Regis
Delete nologging sounds like a cool feature. I assume that nologging would
tell Oracle not to bother keeping an old image of the deleted row in the
rollback buffer, because I promise not to do a rollback.
I RTFMed but couldn't find it. Did a few quick trials in sqlplus, 816 on
Red Hat Linux. Results are below. I have two questions.
1. Nologging seemed to be generating MORE redo than normal delete. !!?
2. Was able to roll back after a delete nologging. !!?
Am I being stupid or something ?
Oops, that's three questions.
Cheers
Greg
SQL> delete greg where b=2;
2 rows deleted.
Execution Plan
----------------------------------------------------------
0 DELETE STATEMENT Optimizer=CHOOSE
1 0 DELETE OF 'GREG'
2 1 TABLE ACCESS (FULL) OF 'GREG'
Statistics
----------------------------------------------------------
0 recursive calls
6 db block gets
1 consistent gets
0 physical reads
544 redo size
646 bytes sent via SQL*Net to client
548 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
2 rows processed
SQL> rollback;
Rollback complete.
SQL> delete greg nologging where b=2;
2 rows deleted.
Execution Plan
----------------------------------------------------------
0 DELETE STATEMENT Optimizer=CHOOSE
1 0 DELETE OF 'GREG'
2 1 TABLE ACCESS (FULL) OF 'GREG'
Statistics
----------------------------------------------------------
0 recursive calls
8 db block gets
1 consistent gets
0 physical reads
692 redo size
646 bytes sent via SQL*Net to client
558 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
2 rows processed
SQL> rollback;
SQL> select * from greg;
A B
---------- ----------
1 2
1 2
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