What will happen after that?

I have a procedure began yesterday to update a table. But I did this morning. Just after I killed the session, I started another SQL to perform the same task to update the same table and the same columns but faster.

What happens now is: the Oracle performs a roll on the procedure killed while the new SQL is running.
So here are my questions:
1. what happens later when SQL is complete and the rear roller is not done yet?
2. the back roller will not affect the new SQL updates?

Thank you

Published by: user644467 on March 11, 2011 09:37

Dive into the concepts manual. A new concept of Oracle [url http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/consist.htm#CNCPT020] concurrency and consistency, it's every (something) Gets a view of the database at the beginning of the (something). (something) is usually a transaction or statement, depending on the configuration and programming. Oracle uses system change numbers to see if each view must include a particular version of data from block, a little like a clock.

So, basically, it all works, but you can see the performance impact just because the stuff happening, and you can see some strange effects, if you don't understand what you do. It is different from the other database engines.

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