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I searched online but could not find particularly consolidated source of what happens when you execute an update query. I know that there are a few actions happening like create redo data and logs etc.

Can experts please explain the step by step actions which happen on udpate execution

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Did you read the Concepts guide? It's all explained in there. –  a_horse_with_no_name Jan 3 '13 at 15:45
Is that a book? –  lordlupine Jan 3 '13 at 16:32
It's (part of) the manual: docs.oracle.com/cd/E11882_01/server.112/e25789/toc.htm –  a_horse_with_no_name Jan 3 '13 at 17:27

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