Re: redo and undo
- From: David Fitzjarrell <oratune@xxxxxxxxx>
- To: "cure@xxxxxxxxxxxxx" <cure@xxxxxxxxxxxxx>, "Oracle-L@xxxxxxxxxxxxx" <Oracle-L@xxxxxxxxxxxxx>
- Date: Mon, 5 Mar 2012 08:16:21 -0800 (PST)
LlogMiner reports the SQL statements to redo or undo the change; it does not
report the amoujnt of redo generated for the operation specified. You would
need to query the data dictionary for such statistics ( The v$mystat view would
show the redo stats for your current session; query v$mystat, run the statement
then query v$mystat again and take the difference -- you should see what you're
expecting to see in terms of redo generation. A query to do this is:
select n.name, m.value
from v$mystat m join v$statname n on (n.statistic# = m.statistic#)
where n.name like 'redo%';
David Fitzjarrell
________________________________
From: Paul Harrison <cure@xxxxxxxxxxxxx>
To: Oracle-L@xxxxxxxxxxxxx
Sent: Monday, March 5, 2012 8:32 AM
Subject: redo and undo
Hi All,
Let's say I run the following command... insert into cure.thecure
(firstname ,lastname) values('oracle','11gr2'); The table has an index on
the lastname column...
Using Log Miner, There is redo and undo for the table block. The book I'm
reading said that all 3 types of blocks (undo, table, index) have generated
redo to protect them. I'm lost here because I do not see redo for the index
block or the undo block. I only see redo and undo for the table block.
Any help is greatly appreciated.
Log Miner info below:
OPERATION SQL_REDO
SQL_UNDO
------------
----------------------------------------------------------------------------
-----
----------------------------------------------------------------------------
------------------------
INSERT insert into "CURE"."THECURE"("FIRSTNAME","LASTNAME") values
('oracle','11gr2'); delete from "CURE"."THECURE" where "FIRSTNAME" 'oracle'
and "LASTNAME" = '11gr2' and ROWID = 'AAARlCAAEAAAAIMAAB';
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