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  • Blog Post: Changing gears

    You haven't heard from me in while and there is a reason. I moved from SQL Server's Storage Engine team to a new incubation team that is involved in exploring new directions in operating systems. This subject area has been always very fascinating for me as you easily might deduce from my previous posts...
  • Blog Post: Q and A: Ratio between AWE Allocated and VM Committed/Reserved in DBCC MEMORYSTATUS output

    Q: What kind of ratio should you expect to see between AWE Allocated and VM Committed/Reserved? We are running 8GB with a cap of 7GB in the max server memory and yet the VM Committed is around 100MB. I was first shocked to see that the sqlservice in task manager only shows that SQL is using around 100MB...
  • Blog Post: Q & A: I am running on 64 bit and all of my tasks are waiting on SOS_RESERVEDMEMBLOCKLIST, What is going on?

    This wait type represents waiting on multi page allocations inside of SQLOS's memory manager. As you remember from my description of memory manager's working internals, it has two major allocators single page allocator, SPA and multi page allocator, MPA. Majority of the time SQL Server internal code...
  • Blog Post: Q & A: Does SQL Server always respond to memory pressure?

    Q: I thought I've seen reference recently to problems with SQL2005 not releasing memory when under pressure, and this was possibly due to the Lock Pages In Memory option. We have a server where this seems to be happening, i.e. SQL2005 uses all available memory and the server basically dies because there...
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