MOM contains its own Block Analysis script. It is a script written on
VB, that looks for the monitored servers, creates for each one
MomCreateObject ("SQLDMO.SQLSer ver"), afterwards connects to each
database on each server and executes SELECT GETDATE() query. If MOM
doesn't receive answer for 6 minutes, it sends alert. Several times
since I started to monitor my servers I received the next alert:
The program "SQLDMO_789 " has been blocked for 6 minutes on database
BurstingDataWar ehouse in the SQL instance MSSQLSERVER. The defined
acceptable blocking threshold is 1 minute(s). "SQLDMO_789 " is running
on SPID 134 as login NT AUTHORITY\SYSTE M and is blocked by SPID 133.
The resource id is KEY: 10:2:1 (a2007950f190)
SQLDMO_789 - is the MOM itself (number varies from time to time). 10 -
is BurstingDataWar ehouse database. As far as I can judge, MOM connects
to the server succesfully (otherwise, how can it know SPID?) The server
itself worked fine at that time - nothing unusual, all the jobs
finished succesfully including the heavy ones. What can block SELECT
GETDATE() query for 6 minutes???
1  2686 
I had a similar issue and it turned out that some scrappy application
held thousands of locks on the tempdb. Run sp_who2 in combination with
sp_lock to see which process is blocking the MOM agent.
M
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This message was already cross-posted to C# and ADO.NET, but I forgot to
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(see below)
=====
Hi,
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