You can have a look at the Site to Site Replication post for more details about the new replication model. This post is a continuation site to site replication post. A number of Stored Procedures can be used to find more details about the backlog along with monitoring of Transmission Queue.The first and very useful one is the stored procedure called “spDiagDRS”. Run “EXEC spDiagDRS” to get the below results (shown in the pic). SCCM SQL Backlog Issues.
The latest blog post on SCCM SQL Based Replication issues – https://howtomanagedevices.com/sccm-replication-issue-sql-based-issues/
The stored procedure “spDiagDRS” will offer details about queued messages. Have a look at the columns named “OutgoingMessagesInQueue” and “IncomingMessagesInQueue”. In ideal scenario, there should NOT be any queued messages and the values of those columns should be ZERO. In my example, “OutgoingMessagesInQueue” is 257 that means some error in the send and we have a backlog.The stored procedure “spDiagDRS” will also tell us about Status and LastSyncTime of each Replication Group. In my example, the SiteSending is CAS and SiteReceiving is PR1. SCCM SQL Backlog Issues
Apart from spDiagDRS, there are some very useful stored procedures that we can use at the time of backlog troubleshooting. See, the list of Stored Procedures below.
More details about these stored procedures in future blog posts …. For the time being, you can check out the following examples of these along with parameters.
EXEC spDiagGetReplicationGroupStats ‘Configuration Data’, ‘PR1’
EXEC spDiagGetProcedureStats ‘100’
EXEC spDiagGetQueryStats ’10’
EXEC spDiagGetRunningQueries ’10’
Transmission Queue is the another option that we should look at, incase of a backlog (or the out going messages are stuck). All the other queues (ConfigMgrDRSSiteQueue, ConfigMgrRCMQueue, ConfigMgrDRSMsgBuilderQueue, ConfigMgrDRSQueue etc. ) shown in the following pic are application related queues.
To check Transmission Queue, you need to run the below SQL query. With the below query, we can check Transmission for a particular primary site (in the below query – CAS server site code = CAS. Primary site code is PR1). SCCM SQL Backlog Issues
SELECT TOP 1000 *, casted_message_body =
CASE message_type_name WHEN ‘X’
THEN CAST(message_body AS NVARCHAR(MAX))
FROM [CM_CAS].[sys].[transmission_queue] where to_service_name = ‘ConfigMgrDRS_SitePR1’
In the below pic, you can see the records waiting for transmit. Have a look at the “transmission_status” column, this will provide more details about any transmission errors. This will be very helpful for further troubleshooting.
vLogs view is the DRS (Data Replication Service) log file. This will provide us more details about DRS process and backlog. SCCM SQL Backlog Issues
Run the following SQL query – “Select top 1000 * from vLogs order by LogTime desc” to get more details about these logs.
SCCM SQL Backlog Issues
RCM_ReplicationLinkStatus table can also provide us more details about the link status of between the sites.
Run the SQL Query – “select * from RCM_ReplicationLinkStatus” . Look at the StatusName column for more details like Failed, Degraded etc..
TRACE stored procedure – For In-depth analysis of backlog . This can be performed by using following stored procedures. Caution – this will create lot of overhead on SQL server also use lot of disk space because of the creation ConfigMgrDBTrace.trc file.
You can start the trace process with “EXEC spDiagStartTrace”. This process will create .trc (trace file) – in the SQL installed location “C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA\ConfigMgrDBTrace.trc”. Also, this process will start tracing each and every event of the SQL server. To stop trace use “EXEC spDiagStopTrace”. Ensure that you STOP the trace ASAP otherwise it may create some adverse impact on the server. SCCM SQL Backlog Issues.
You can use SQL Server Profiler to open the .trc file. You will get depth details about each event performed by SQL server during the time of TRACE. like Duration, EventClass, StartTime etc.