August 2009
Intermediate to advanced
464 pages
13h 59m
English
Content preview from SQL Server 2008 Administration in Action
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17.1. SQLOS schedulers
SQL Server is a large and complex product with many interconnected components requiring access to common services such as memory allocation and process scheduling. In order to reduce the complexity of each of these components, the SQL Server architecture includes a layer responsible for providing common services.
In SQL Server 2000, this layer, known as the User Mode Scheduler (UMS), was quite thin and had limited responsibilities. Therefore, the ability of the various SQL Server components to take maximum advantage of emerging hardware architecture such as NUMA and hot-add memory was limited. In addressing this, Microsoft rewrote this layer in the SQL Server 2005 release and renamed it the SQL Operating System (SQLOS). ...
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