How do I read uncommitted records of another session

HI
How do I read uncommitted records from another session in Oracle
Thanks
Ashwin

Ashwin,
Oh I might as well add my thoughts on this as it is kinda an important subject. I'm sort of a different kind of programmer where there have been several times I have wanted to see the changed results that another session is doing. I agree that the rest of the sessions should not be able to SEE the changes until they are committed. HOWEVER, as some examples show below, I don't see why a custom package can't be developed to allow a different session to be able to query the changed data for a particular SID, or even begin issuing DML commands of their own on this changed data to help change it further.
In reality, there is no reason why a single (and I emphasize single) session is the only one who can see the changed data. It's the other user sessions that really should wait until all the necessary changes are complete before others can see the changed information. There isn't much point in me trying to explain this in great detail, but overall YES other users should wait until the changes are committed, but NO I do think I should be able to connect to another SIDs sessions and be able to view/perform operations on this changed data.
There are more than enough examples of why others should wait before changes are committed (which I agree), but as some of these real life examples point out, there is a need to let more than a single session perform such changes, each of which need to see each other's changed data.
No I am no expert on transaction processing (Andrew knows more for sure), but I've done enough to know as a developer I have a number of times wanted to be able to access/monitor another sessions uncommitted data. I think some records might be viewable using committed AUTONOMOUS_TRANSACTION records, but I've yet to really try it out much.
Examples where one wants to see others uncommitted data
(+) Say I want to change a hundred / thousand / million tables for a task. Each of these tables require joins/lookups to see each others data (including the changed records). I'm not going to want to do this with one session. Why can't 10 or a 100 sessions be created to allow complex DML operations to be performed to accomplish a given task. It's like thinking of there is 1 session doing this task, but on the oracle side, there are a unlimited number of SIDs processing (100 sqlplus scripts running), all being able to see the uncommitted data. Once everything is done, then the rest of the sessions can see this information.
(+) A process is running and is changing records, and I want to monitor its progress or even assist it it's getting behind.
(+) A real life example I just remembered was a soccer game done overseas where a time zone problem allowed people to still be able to place bets even after the game was over (they still paid people even though they knew the final score which was nice of them). In this case yes a process should have been stopped from allowing bets/inserts to continued, but having a second (or more) processes being able to KNOW for certain that another session is inserting data when it shouldn't be, this is can be stopped. And yes once again you can say one can monitor the sga for the appearance of inserts and stop it and yes remove the insert privs from that user after a certain time (come to think of it that wouldn't have worked since the time was off). But yes a whole slue of other things could have been done to stop this process from recording this information. However, NOT being able to select data from that table where the inserts were going into, until its toooooooooo late, is a real problem. Being able to see uncommitted information is very important if it needs to be stopped.
Overall I do think there should be something considered to allow to a session to be able to see what data another session is doing, but it's more on the side from administration of the data and the performance required to get a task done, even if it means sharing uncommitted changes between sessions.
Tyler D.

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