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expensive can be controlled with a configuration option called cost threshold for parallelism. Under the normal pooling scheme, a worker thread runs each user request to completion. Because each thread has its own stack, stack switching is unnecessary. If a given thread performs an operation that causes a page fault, only that thread, and hence only that one client, is blocked. (A page fault occurs if the thread makes a request for memory, and the virtual memory manager of the operating system must swap that page in from disk since it had been paged out. Such a request for memory must wait a long time relative to the normal memory access time, because a physical I/O is thousands of times more resource-expensive than reading real memory.) Now consider something more serious than a page fault. Suppose that while a user request is being carried out, a bug is exposed in SQL Server that results in an illegal operation s causing an access violation (for example, the thread tries to read some memory outside the SQL Server address space). Windows NT/2000 immediately terminates the offending thread an important feature of a truly protected operating system. Because SQL Server makes use of structured exception handling in Windows NT/2000, only the specific SQL Server user who made the request is affected. All other users of SQL Server or other applications on the system are unaffected and the system at large will not crash. Of course, such a bug should never occur and in reality is indeed rare. But this is software, and software is never perfect. Having this important reliability feature is like wearing a seat belt you hope you never need it, but you are glad it s there in case a crash occurs.
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NOTE: Since Windows 95 and Windows 98 do not support SMP systems or thread pooling, the previous discussion is relevant only to SQL Server running on Windows NT/2000. The following discussion of disk I/O is also only relevant to SQL Server on Windows NT/2000.
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SQL Server 2000 uses two Windows NT/2000 features to improve its disk I/O performance: scatter-gather I/O and asynchronous I/O. The following descriptions were adapted from Books Online:
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Scatter-Gather I/O As just mentioned, scatter-gather I/O was introduced in Windows NT4, Service Pack 2. Previously, all the data for a disk read or write on Windows NT had to be in a contiguous area of memory. If a read transferred in 64K of data, the read request had to specify the address of a contiguous area of 64K of memory. Scatter-gather I/O allows a read or write to transfer data into or out of noncontiguous areas of memory.
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If SQL Server 2000 reads in a 64K extent, it does not have to allocate a single 64K area and then copy the individual pages to buffer cache pages. It can locate eight buffer pages and then do a single scatter-gather I/O that specifies the address of the eight buffer pages. Windows NT/2000 places the eight pages directly into the buffer pages, eliminating the need for SQL Server to do a separate memory copy.
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Asynchronous I/O In an asynchronous I/O, after an application requests a read or write operation, Windows NT/2000 immediately returns control to the application. The application can then perform additional work, and it can later test to see if the read or write has completed. By contrast, in a synchronous I/O, the operating system does not return control to the application until the read or write completes. SQL Server supports multiple concurrent asynchronous I/O operations against each file in a database. The maximum number of I/O operations for any file is controlled by the max async io configuration option. If max async io is left at its default of 32, a maximum of 32 asynchronous I/O operations can be outstanding for each file at any time.
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