Identity Range not working for Merge Replication in SQL Server 2005

Back in Sept 2007 I blogged about the problem we were having with the identity range in merge replication:@@identity not working after SQL Server 2005 upgrade The problem continued until today, this post is to explain what we figured out.

The error message that describes this problem reads as follows:

[548] The insert failed. It conflicted with an identity range check constraint in database ‘DatabaseName’, replicated table ‘dbo.TableName’, column ‘ColumnNameId’. If the identity column is automatically managed by replication, update the range as follows: for the Publisher, execute sp_adjustpublisheridentityrange; for the Subscriber, run the Distribution Agent or the Merge Agent.

The identity range adjustment happens after every insert in the given article. The code responsible for the identity check adjustment is on the system trigger for the published article:
MSmerge_isn_GUID where GUID is the GUID for the given article.

if is_member(‘db_owner’) = 1
begin
— select the range values from the MSmerge_identity_range table
— this can be hardcoded if performance is a problem
declare @range_begin numeric(38,0)
declare @range_end numeric(38,0)
declare @next_range_begin numeric(38,0)
declare @next_range_end numeric(38,0)

select @range_begin = range_begin,
@range_end = range_end,
@next_range_begin = next_range_begin,
@next_range_end = next_range_end
from dbo.MSmerge_identity_range where artid=’BAEF9398-B1B1-4A68-90A4-602E3383F74A’ and subid=’0F9826DB-50FB-4F73-844D-AE3A111B4E1C’ and is_pub_range=0

if @range_begin is not null and @range_end is not NULL and @next_range_begin is not null and @next_range_end is not NULL
begin
if IDENT_CURRENT(‘[dbo].[TableName]’) = @range_end
begin
DBCC CHECKIDENT (‘[dbo].[TableName]’, RESEED, @next_range_begin) with no_infomsgs
end
else if IDENT_CURRENT(‘[dbo].[TableName]’) >= @next_range_end
begin
exec sys.sp_MSrefresh_publisher_idrange ‘[dbo].[TableName]’, ‘0F9826DB-50FB-4F73-844D-AE3A111B4E1C’, ‘BAEF9398-B1B1-4A68-90A4-602E3383F74A’, 2, 1
if @@error<>0 or @retcode<>0
goto FAILURE
end
end
end

As you might have noticed already, if the insertion is made by a user that is not member of the db_owner database role, the identity adjustment won’t happen. I believe this is a bug, not a feature. It forces the users that are allowed to do insertions to be owners of the database, or they will have the run out of identities error quite often and a manual adjustment will be required.

What the savvy DBA can do:

The template for all of the MSmerge_ins_GUID triggers are on the model database, these triggers are created by the system stored procedure: sp_MSaddmergetriggers_internal

If you change the code on this system stored procedure any new database creation will have the proper template for creating the merge insertion triggers. For the existing databases, you might like to modify the MSmerge_ins_GUID trigger manually, for now.

At the time I’m writing this post I’m not aware if this issue is addressed on any cumulative update. There is a similar case on the Cumulative Update released on January 15, 2008
http://support.microsoft.com/kb/941989

Happy coding guys!

2 thoughts on “Identity Range not working for Merge Replication in SQL Server 2005”

  1. Bleah! I chimed in on the Connect bug as well. You'd have to run your applications as db_owner avoid this — what was Microsoft thinking?

  2. Added my vote too – 4 1/2 years on and it seems the same issue remains. We’re using 2008 R2. If this has been solved can someone post the fix here and on the MS connect page. Thanks.

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