Virtual Address Space Pressure And AppDomain

Nov 9, 2007

We are dealing with occasional problems running out of virtual address space. I have implemented a job that records VAS every two minutes using the dm_os_virtual_address_dump function. When I notice a big drop in VAS I look at the SQL log and see event like:


Common language runtime (CLR) functionality initialized using CLR version v2.0.50727 from C:WINDOWSMicrosoft.NETFrameworkv2.0.50727

AppDomain 2 (32767.dbo[runtime].1) created.


In this case VAS dropped from 53MB down to 7MB. Then just 5 minute later I see these events


AppDomain 2 (32767.dbo[runtime].1) is marked for unload due to memory pressure

AppDomain 2 (32767.dbo[runtime].1) unloaded.

But we don't seem to recover any VAS and eventually have to reboot. We are using replication and I sometimes see this when replication restarts after we have an out of sync data issue. We do not have SQL CLR enabled.

Does anyone have any insight on what is going on? What triggers these AppDomains to be created and why does it eat up all the VAS? How could replication have anything to do with it?


We are running...
SQL Server 2005 Enterprise sp2 (with hotfix 3175)

Windows Server Enterprise 2003 SP1 32GB RAM
Max Server Memory in sp_configure = 29000MB


THANKS

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AppDomain &&<number&&>' (&&<database&&>.dbo[runtime].527) Is Marked For Unload Due To Memory Pressure.

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Please, help

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3/14/2008 2:18:44 PM AppDomain 1668 (FDESK_CANCUN.dbo[runtime].1679) is marked for unload due to memory pressure.
3/14/2008 2:18:44 PM AppDomain 1668 (FDESK_CANCUN.dbo[runtime].1679) unloaded.


In this database only have one assemblie installed created using Vb.Net 2005, please help me how to diagnose where are the problem.

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