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I know cdc is change data capture..

as a beginner can you help me to start from the beginning,,,
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Most Valuable Expert 2011
Top Expert 2012
cdc is an entire industry.

the basic idea is you use the database transaction logs,  extract the changes from those logs, then run them on another database.
In much the same idea as using Oracle's log miner.

if you want more specific answers, you're going to have be more specific in your question
For getting change data capture knowledge you can go through the document on the below link  :