I got hired into a new company and they had merge replication already in place. They have had issues with it to the point I have to evaluate whether to keep it or replace it. The main issue is it takes many hours (over 12 hours in some cases) to insert or update a record. Honestly that is just unacceptable.

As an example I am trying to insert one record into a table (ComputerUsers) that links a laptop to a user. You only have two columns (one is call ComputerID and one is called UserID). There is a Computers table that stores the ComputerIDs and the Computername. There also is a Users table that stored the UserID and username.

All I am trying is insert one record into the ComputerUsers table. Last time I ran it it took over 13 hours. This table is published and it is part of the Dynamic Filter.

I have tried everything I have read online. I created two separate indexes for the UserID and ComputerID columns since they are both included in separate joins in the Filter. There is also a clustered primary key on the Userid and ComputerID columns since the combination of the two are unique (A computer can be assigned to two users or vica versa). I have also have tried rebuilding the indexes and even created some suggested indexes on the merge replication tables.

I am at my wit's end. What am I missing? I find it hard to believe this is normal for Replication because I doubt anyone would use it if it was. Thanks.

  • What service pack you are running 2008 SQL server ? What edition - standard, enterprise? - for pub, subscriber and distributor.
    – Kin Shah
    Commented Mar 24, 2015 at 20:41
  • Also, try running sp_whoisactive when you are doing an insert - what wait types are associated, how many CPU, memory, etc.
    – Kin Shah
    Commented Mar 24, 2015 at 20:42
  • Have you checked the overall performance of the server? Is there blocking? When was the last time statistics were updated?
    – stacylaray
    Commented Mar 24, 2015 at 20:53
  • I am running SQL Server 2008 R2 Service Pack 1 Standard Edition. Do you applying service pack 3 would help? I also forgot to mention that I only do these inserts/updates on off hours because if I did it when people were in the database it would knock them out. Commented Mar 24, 2015 at 23:06
  • In all my years doing merge replication, it comes down to joins defined, and indexes. That is where you need to start.
    – Greg
    Commented Feb 5, 2017 at 2:31

1 Answer 1


I had a very similar sounding problem. We replicated a table with millions of rows. One of the subscribers would take up to 2 minutes to insert 100 new rows.

I solved the issue by adding an index to the rowguid column of the table it was inserting to. I know this sounds like it should degrade performance but it looked like it was doing a full table scan before inserting, probably to make sure a duplicate row was not inserted.

Once I added this index replication was running smoothly again

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