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Availability Group sync - How does it work?

    Question

  • Hi everyone,

    I am new to SQL Availability Groups and have problems understanding the sync mechanism. I did not find  proper answer on my search.

    I'd like to know how to sync between the databases works. To my understanding there are 2 possibilities.

    1) The listener cares to keep the data synced. Whenever the listener gets a (write) request it sends it to all nodes and in synchronous state it waits for ack.

    2) The sync happens on the database level. The primary node receives the request and sends it to the replicas server.

    Would be nice if someone could shortly explain the correct mechanism to me.

    Thank you.

    Tuesday, February 25, 2014 7:49 AM

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