What does SQL write to that allow changes to be undone or rolled back in case of a system failure?

What does SQL write to that allow changes to be undone or rolled back in case of a system failure?
Hello,
If i read your question correctly you are asking about how uncommited transaction are rolled back.For this, concept of transaction log came into picture.where first changes were first made to transaction log and then into memory .Before any change is made
to real data file change is made to trn log files so that if rollback comes it can see in log and rollback it.
I would suggest you to read Famous article by log which will explain you
http://technet.microsoft.com/en-us/magazine/2009.02.logging.aspx
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers

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What does 'security setup forms that accept sql statement' mean?

I was referring one white paper 'Best Practices for Securing Oracle E-Business Suite'.
I would like to know what does 'security setup forms that accept sql statement' mean in that?
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Where can the SQL statements be entered?
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Edited by: Kavipriya on 30 Mar, 2011 3:37 PM

It is explained in the same docs.
Best Practices for Securing the E-Business Suite [ID 189367.1] -- Page 26, under "LIMIT ACCESS TO FORMS ALLOWING SQL ENTRY" section.
Best Practices For Securing Oracle E-Business Suite Release 12 [ID 403537.1] -- Page 22, under "LIMIT ACCESS TO FORMS ALLOWING SQL ENTRY" section.
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What does SQL write to that allow changes to be undone or rolled back in case of a system failure?

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