SQLServer性能分析参数
欢迎进入Windows社区论坛，与300万技术人员互动交流 >>进入 当您怀疑计算机硬件是影响SQL Server运行性能的主要原因时,可以通过SQL Server Performance Monitor监视相应硬件的负载,以证实您的猜测并找出系统瓶颈.下文将介绍一些常用的分析对象及其参数. Memo
欢迎进入Windows社区论坛，与300万技术人员互动交流 >>进入
当您怀疑计算机硬件是影响SQL Server运行性能的主要原因时,可以通过SQL Server Performance Monitor监视相应硬件的负载,以证实您的猜测并找出系统瓶颈.下文将介绍一些常用的分析对象及其参数.
Memory: Page Faults / sec
如果该值偶尔走高,表明当时有线程竞争内存.如果持续很高,则内存可能是瓶颈.
Process: Working Set
SQL Server的该参数应该非常接近分配给SQL Server的内存值.在SQL Server设定中,如果将“set working set size”置为0, 则Windows NT会决定SQL Server的工作集的大小.如果将“set working set size”置为1,则强制工作集大小为SQLServer的分配内存大小.一般情况下,最好不要改变“set working set size”的缺省值.
Process:%Processor Time
如果该参数值持续超过95%,表明瓶颈是CPU.可以考虑增加一个处理器或换一个更快的处理器.
Processor:%Privileged Time
如果该参数值和“Physical Disk”参数值一直很高,表明I/O有问题.可考虑更换更快的硬盘系统.另外设置Tempdb in RAM,减低“max async IO”,“max lazy writer IO”等措施都会降低该值.
Processor:%User Time
表示耗费CPU的数据库操作,如排序,执行aggregate functions等.如果该值很高,可考虑增加索引,尽量使用简单的表联接,水平分割大表格等方法来降低该值.
Physical Disk:Avg.Disk Queue Length
该值应不超过磁盘数的1.5~2倍.要提高性能,可增加磁盘.
注意:一个Raid Disk实际有多个磁盘.
SQLServer:Cache Hit Ratio
该值越高越好.如果持续低于80%,应考虑增加内存. 注意该参数值是从SQL Server启动后,就一直累加记数,所以运行经过一段时间后,该值将不能反映系统当前值.
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