[转载]SQL压力测试用的语句和相关计数器

将数据库中所有表的所有的内容选一遍:

IF object_id(‘tempdb..#temp’)   is   not   null
BEGIN
DROP TABLE #temp
END

DECLARE @index int
DECLARE @count int
DECLARE @schemaname varchar(50)
DECLARE @tablename varchar(50)
set @index=1
set @count=(select count(*) from sysobjects where xtype=’U’)

select row_number() over(order by name) as rowNumber,name,
( SELECT a.name from sys.tables t inner join sys.schemas a
ON t.schema_id=a.schema_id
WHERE t.name=ob.name) as schemaname
into #temp from sysobjects ob where xtype=’U’

WHILE(@index<@count)
BEGIN
set @schemaname=(SELECT schemaname from #temp where rowNumber=@index)
set @tablename=(SELECT name from #temp where rowNumber=@index)

exec(‘select * from ‘+ @schemaname+’.’+@tablename)

set @index=@index+1

END

通常来说，需要看如下几个计数器（下面资料参考自http://www.sqlservercentral.com/articles/Miscellaneous/2634/）:

• Memory: Pages/sec
• Memory: Available Bytes
• Network Interface: Bytes Total/Sec
• Physical Disk: % Disk time
• Physical Disk: Avg. Disk Queue Length
• Processor: % Processor Time
• System: Processor Queue Length
• SQL Server Buffer: Buffer Cache Hit Ratio
• SQL Server General: User Connections

Memory: Pages/sec:最好不要大于5，否则有内存问题

Memory: Available Bytes :这个可以望文生义，不解释

Network Interface: Bytes Total/Sec :如果这个计数器下降的太快有可能是网络出现问题

Physical Disk: Avg Disk Queue Length:每个逻辑盘的等待队列，大于2有可能是IO瓶颈问题

Physical Disk: % Disk time: 读/写活动的百分比，不要大于90%,和上面的计数器一起可以显示IO瓶颈

Processor: % Processor Time :CPU瓶颈，不要大于90%，大多数情况下，内存和IO瓶颈要更多

System: Processor Queue Length :同样，和上面计数器一起找出IO瓶颈

SQL Server Buffer: Buffer Cache Hit Ratio :缓存命中率，不要低于85%,否则考虑加内存

SQL Server General:并发数,压测时快到某一瓶颈看看这个数字，可以作为基准(BaseLine)记下来