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Transactional replication very slow with indexes on Subscriber table

  • May 12, 2014 at 10:32 am

    #1712770

    It makes sense to me that adding indexes would greatly slow down replication. Think about it, for each index SQL Server has to make a copy of the data for the columns used in the index. So you are doing a lot more writes than you would be without indexes.

    Jack Corbett
    Consultant - Straight Path Solutions
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  • May 12, 2014 at 2:00 pm

    #1712842

    Thanks for your response. I understand that adding indexes will add some extra time to replicate all records. But an increase of >10000% ?

    As you see in the log there are 4919 command/sec when writing without indexes and only 64 commands/sec with indexes on the Subscriber table. It's a huge difference and I really can't believe this has only to do with the indexes.

    We had exactly the same replication set before on another server where the indexes added a few minutes to the replication time, but not a difference of almost 3 hours(!). So I really think the error has to be somewhere else:(

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