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I am currently working as junior Oracle DBA in a company.Now my team leads always tell me that I have to understand how SCN works and what I can do with the knowledge about SCN.So,are they really correct? I know SCN is system change number and a little more something about SCN but where can I find the exhaustive documentation and practice material related to SCN?

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up vote 1 down vote accepted

According to the Glossary from the Oracle Documentation

System Change Number. A database ordering primitive. The value of an SCN is the logical point in time at which changes are made to a database.

There is lots of info you can easily Google

Even the DBA StackExchange already has questions around the SCN

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The best source for Oracle internals is generally the Oracle Concepts Guide.

In this case they have a pretty good description, including how it works as part of transaction control.

http://docs.oracle.com/cd/E11882_01/server.112/e25789/transact.htm#CNCPT039

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Nothing beats the Docs. +1 !!! –  RolandoMySQLDBA May 21 '13 at 14:36
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