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If you don t have enough memory, you will have excessive paging If you re coming from an MCSA or MCSE background, or even an A+ background, that statement may be all you need to know You understand that excessive paging can cause significant performance degradation However, I find that in the classroom, paging vs excessive paging isn t always well understood by students taking SQL classes So here s a basic explanation Paging occurs when you don t have enough physical memory Take a look at Figure 6-2 It shows that we have a finite amount of physical RAM If we run an operating system (OS) and launch a couple of programs such as Internet Explorer and Outlook, everything runs from RAM Now we want to run Word, but there s no more physical RAM
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Figure 6-2 Physical RAM and the paging file
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RAM physical memory OS IE Outlook Paging file Hard disk virtual memory
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What could be done is to move the program Internet Explorer to the paging file on the hard disk to make room for Word in physical RAM In Figure 6-3 we can see that Internet Explorer has been moved to the hard disk Now we have room to launch Word in the physical RAM
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Figure 6-3 Swapping data into the paging file
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Let s make something clear, though This is a simplistic explanation The operating system doesn t actually swap out full programs Instead, pages of memory (64KB blocks) are swapped back and forth between physical memory and virtual memory (on the hard drive) This is where the term paging comes from When you have as much physical memory as you need, very little swapping occurs between the physical memory and the paging file on the disk In other words, very little paging occurs When we don t have enough physical memory, data needs to be swapped back and forth between the disk and memory, and we have a lot of paging The disk subsystem is overworked and the server appears slow
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TIP Checking for excessive paging is the single best indicator of whether memory is a bottleneck in most systems In SQL Server, we would also check the utilization of cache Sometimes an inexperienced user notices that the hard drive is excessively busy and the system is unusually slow, and erroneously concludes that the hard drive is the source of the problem Yes, the system is slow, and yes, the hard drive is busy, but the core problem is not having enough RAM Replacing the hard drive with a bigger, faster hard drive or drive subsystem won t alleviate the core problem of not enough RAM
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The processor needs to be sufficiently large to support the load If not, we have a few choices:
Offload some processing tasks Upgrade the processor to a faster processor Add additional processors
If your server is managing multiple databases, offloading processing tasks is relatively easy You just move some of the databases to another SQL Server If this isn t possible, you upgrade your server with more or faster processors As a reminder from 1, SQL Server 2005 Standard Edition can support four CPUs, and SQL Server 2005 Enterprise can support as many CPUs as the operating system supports If you re running Windows Server 2003 Data Center Edition, you can support as many as 64 CPUs in SQL Server 2005 Enterprise Edition
Processor Affinity
When using multiple processors, you may choose to either allow SQL Server to dynamically identify which processors to use and when, or restrict SQL Server to using only certain processors We can do this by manipulating the affinity mask option The affinity mask option controls CPU affinity, or said another way, it defines which processor(s) are used by SQL Server Microsoft recommends setting processor affinity with the system stored procedure sp_configure The following script can be used to set the affinity mask to 0 to allow SQL Server to dynamically allocate CPUs:
sp_configure 'show advanced options', 1; RECONFIGURE; GO sp_configure 'affinity mask', 0; RECONFIGURE; GO
In contrast, let s say you have six processors and you want SQL Server to use only four of them, processors 1, 3, 4, and 5 You can do this by setting the affinity mask to 58 decimal
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