Solved

Finding when Rollbacks occur in Oracle

Posted on 2013-11-04

Oracle Database

1 solution

447 Views

Last Modified: 2013-11-05

We have an application we suspect is not properly hadnling rollbacks. The symptom is occasionally (maybe 1 out of 1000 times) a scenario occurs one of the tables gets out of sync such that it appears a transaction is partially committed.

When this occurs our dba cannot find any errors in the Oracle log, but I am not sure we have logging levels at the highest setting.

When the problem occurs next, we can idenify the approximate time that it occured. Is there any Oracle tool that can show us if any rollbacks occurred at that time?

Thanks!

Comment

Question by:gantone1

[X]

Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

Help others & share knowledge
Earn cash & points
Learn & ask questions

Join The Community

6 Comments

LVL 78

Expert Comment

by:arnold

ID: 396233822013-11-04

You've defined the problem, but since I am not an oracle person, not sure whether a non-committed transaction is recorded and even if it is, not sure whether you can track it back given that you may have many transactions started and some committed while other rolled back.

You have to review your code that deals with this table combination and if you don't have it already look at the transactions/process.

You may have depended transactions that are setup independently.

LVL 37

Expert Comment

by:Geert Gruwez

ID: 396235382013-11-04

have you tried adding a
begin exception >>log the exeception end
block around the rollback to catch any possible error ?

i came across a nesting of savepoints once which wasn't correct
something like this:

savepoint a;
if x > 1 then 
  savepoint b;
  if Y > 1 then 
    if Z > 1 then 
      rollback to a;
    end if;
    commit b;
  end if;
end if;
commit a;

Open in new window

LVL 78

Expert Comment

by:arnold

ID: 396240242013-11-05

I think the asker is looking for an oracle DB level tool to discover this.
I suspect at this time, the code where this is an issue is yet to be located/identified.

LVL 15

Accepted Solution

by:Franck Pachot

Franck Pachot earned 500 total points

ID: 396241712013-11-05

Hi,
You can have statistics such as the number of rommits/rollbacks in a session.
But if you need more information, only logminer can help. It is an Oracle tool to read the redo logs and they have information about each updates and each commit/rollback.
Regards,
Franck.

Author Closing Comment

by:gantone1

ID: 396243652013-11-05

I am trying to collect evidence of production problem that can be given to development group to help them isolate cause of problem. If I can prove a rollback occured at the time that problem occurred, it will help them isolate the problem

Is Logminer the best tool for examining the redo logs? Is there any place other than the Redo logs that Rollbacks are logged?

Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to use Access Control Lists in Oracle

Article by: sdstuber

Working with Network Access Control Lists in Oracle 11g (part 1) Part 2: http://www.e-e.com/A_9074.html So, you upgraded to a shiny new 11g database and all of a sudden every program that used UTL_MAIL, UTL_SMTP, UTL_TCP, UTL_HTTP or any oth…

Oracle Database

Script to backup Dataguard broker configuration

Article by: Abhimanyu

Shell script to create broker configuration file using current broker Configuration, solely for purpose of backup on Linux. Script may need to be modified depending on OS-installation. Please deploy and verify the script in a test environment.

How to Extract Information from the Oracle Data Dictionary Views

Video by: Steve

This video shows information on the Oracle Data Dictionary, starting with the Oracle documentation, explaining the different types of Data Dictionary views available by group and permissions as well as giving examples on how to retrieve data from th…