I'm investigating the slowdown of a system and am finding sp_MSunmarkreplinfo is blocking.
It is trying to get a schema modify lock but is being blocked by other things. This is then blocking a lot of other processes on the system that are trying to get schema shared locks. It is different SPs that are blocking sp_MSunmarkreplinfo so I don't think there is anything that can be done about that.
I would have thought that sp_MSunmarkreplinfo is only called when removing a table from replication? Should I be looking for someone/something that is trying to alter replication or is this sometimes called as part of the replication processing?