After update row level trigger help

Hello,
I have to update some data on a table. I need to be able to undo the update just in case something goes wrong after update is comitted. I decided to keep track of updated rows by inserting new and old values on a audit table using UPDATE ROW LEVEL trigger. Everything working fine as I wished, but here is what I am having a problem in separating each bulk of update by a unique ID... I am not talking about any primary key or autogenerated sequence key here.
Audit table inserts values: primary key of table, old value before update, new value after update, and time stamp. Now, I want add one more field on the audit table that indentifies each bulk of UPDATE operation... I tried to use session ID, it works fine, but sometimes I may update two or three times, maybe around same time, on the same day from the same session (timestamp doesn't help me). In that case, each UPDATE operation inserts the same session ID on Audit table. I won't know which update operation populated which row of the audit table.
Can somebody give me how I can resolve this situation. Again, this has to be inside the trigger. Is there any other IDs that I can use? I would appreciate your help. Thanks,

Can you add a table level trigger in addition to your row level trigger? If so, you could do what you want in there. In the new trigger, formulate a unique value (such as session id || sysdate) and store it using dbms_application_info.set_module and set the MODULE to that value. Then, in your row level trigger code, execute dbms_application_info.read_module and pull the MODULE value and insert it into your audit table.
The use of session id || sysdate should be fine (and unique) in this context. You'd just have to know at what time the UPDATE batch occurred that you wanted to undo.
By the way, you could use LogMiner to do what I think you're trying to create with the use of your trigger code and table entries. Recall the Oracle keeps the undo and redo data for every row that is updated in the redo/archive logs. Using LogMiner, you could find and undo any change from any time. Just like your method, you'd have to know when the "bad" thing occurred in order to find the correct log and "mine" it, but all the functionality is there. There's a kinda old, but very good, article by Arup Nanda at http://www.oracle.com/technology/oramag/oracle/05-jul/o45dba.html that reviews how it all works. You may want to look at it to see if you can avoid re-inventing the wheel to meet your needs. Just a thought....
Karen

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798616 wrote:
Hi Experts,
I'm working on EBS 11.5.10 and database 11g. I have trigger-A on wip_discrete_jobs table and trigger-B on wip_requirement_operations table.When ever i create discrete job, it inserts record in both wip_discrete_jobs and wip_requirement_operations.
Note:2 tables are like master-child relation.
Trigger-A: After Insert.Row Level trigger on wip_discrete_jobs
Trigger-B:After Insert,Row Level trigger on wip_requirement_operations
In Trigger A:
I'm capturing wip_entity_id and holding in global variable.
package.variable:=:new.wip_entity_id
In Trigger B:
I'm using the above global variable.
Issue: Let's say i have create discrete job,it's wip_entity_id is 27, but the global variable is holding the previous wip_entity_id(26),not current value.It looks like before trigger A event is complete, trigger B is also in process, i think this could be the reason it's not storing the current wip_entity_id in the global variable.
I need your help how to have the current value in the global variable so that i can use that in the trigger B.
Awaiting response at the earliest.
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