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 SQL Server Administration (2008)
 CDC polling Mechanism
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chamberssh
Starting Member

6 Posts

Posted - 08/19/2014 :  10:44:20  Show Profile  Reply with Quote
Can anyone explicitly explain how SQL Server conducts polling for CDC, the documentation states that:-

"The capture job is started immediately. It runs continuously, processing a maximum of 1000 transactions per scan cycle with a wait of 5 seconds between cycles"

What I want to know is how physically is this 'wait' happening. I can see that it is not the CDC job itself, as there is not scheduler attached to it, every re-run every 5 seconds. Does this mean that it is a continuous loop, re checking every 5 seconds?

Thanks

chamberssh
Starting Member

6 Posts

Posted - 08/20/2014 :  06:20:04  Show Profile  Reply with Quote
For those reading this, this the CDC capture job uses the system 'Replication Log Reader Agent' which as MSDN states:-

"he Replication Log Reader Agent is an executable that monitors the transaction log of each database configured for transactional replication and copies the transactions marked for replication from the transaction log into the distribution database."
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