The Accidental DBA:Troubleshooting Performance

--数据表、索引参考Identifying Duplicate Indexes(http://www.cnblogs.com/Uest/p/6679504.html)中的测试数据
USE Test
GO
SELECT * 
INTO Test.dbo.SalesOrderDetail_IndexUsage
FROM AdventureWorks2008R2.Sales.SalesOrderDetail
GO
--CREATE UNIQUE CLUSTERED INDEX SalesOrderDetail_IndexUsage ON dbo.SalesOrderDetail(SalesOrderDetailID)
CREATE INDEX IX_SalesOrderID1 ON dbo.SalesOrderDetail_IndexUsage(SalesOrderID,rowguid,SalesOrderDetailID) INCLUDE(LineTotal)
--CREATE INDEX IX_SalesOrderID2 ON dbo.SalesOrderDetail_IndexUsage(SalesOrderID,rowguid) INCLUDE(LineTotal)
--CREATE INDEX IX_SalesOrderID3 ON dbo.SalesOrderDetail_IndexUsage(SalesOrderID,rowguid) INCLUDE(SalesOrderDetailID,LineTotal)
--CREATE UNIQUE INDEX IX_SalesOrderID4 ON dbo.SalesOrderDetail_IndexUsage(SalesOrderID,rowguid) INCLUDE(SalesOrderDetailID,LineTotal)
GO

--查看索引使用情况
select o.name,i.index_id,i.name,user_seeks,user_scans,user_lookups,user_updates
from sys.dm_db_index_usage_stats ddus
inner join sys.tables o
on ddus.object_id=o.object_id
inner join sys.indexes i
on ddus.index_id=i.index_id
and ddus.object_id=i.object_id
where database_id = db_id()
and o.name=‘SalesOrderDetail_IndexUsage‘
order by i.index_id

--查询返回12行
select * from SalesOrderDetail_IndexUsage WHERE SalesOrderID=43659
--sys.dm_db_index_usage_stats结果
name    index_id    name    user_seeks    user_scans    user_lookups    user_updates
SalesOrderDetail_IndexUsage    0    NULL    0    0    1    0
SalesOrderDetail_IndexUsage    2    IX_SalesOrderID1    1    0    0    0

--更新影响12行
UPDATE SalesOrderDetail_IndexUsage 
SET LineTotal=LineTotal*1
WHERE SalesOrderID=43659
--sys.dm_db_index_usage_stats结果
name    index_id    name    user_seeks    user_scans    user_lookups    user_updates
SalesOrderDetail_IndexUsage    0    NULL    0    0    1    1
SalesOrderDetail_IndexUsage    2    IX_SalesOrderID1    2    0    0    1

--删除影响12行
DELETE from SalesOrderDetail_IndexUsage 
WHERE SalesOrderID=43659
--sys.dm_db_index_usage_stats结果
name    index_id    name    user_seeks    user_scans    user_lookups    user_updates
SalesOrderDetail_IndexUsage    0    NULL    0    0    1    2
SalesOrderDetail_IndexUsage    2    IX_SalesOrderID1    3    0    0    2

--插入12行
SET IDENTITY_INSERT dbo.SalesOrderDetail_IndexUsage on
INSERT INTO SalesOrderDetail_IndexUsage
(SalesOrderID,SalesOrderDetailID,CarrierTrackingNumber,OrderQty,ProductID,SpecialOfferID,UnitPrice,UnitPriceDiscount,LineTotal,rowguid,ModifiedDate)
select * from AdventureWorks2008R2.Sales.SalesOrderDetail
WHERE SalesOrderID=43659
SET IDENTITY_INSERT dbo.SalesOrderDetail_IndexUsage OFF
--sys.dm_db_index_usage_stats结果
name    index_id    name    user_seeks    user_scans    user_lookups    user_updates
SalesOrderDetail_IndexUsage    0    NULL    0    0    1    3
SalesOrderDetail_IndexUsage    2    IX_SalesOrderID1    3    0    0    3

--注意在sqlserver2012某些版本，重建索引会清空sys.dm_db_index_usage_stats中此索引的条目
ALTER INDEX IX_SalesOrderID1 ON SalesOrderDetail_IndexUsage REBUILD

-- Clean up
--DROP TABLE Test.dbo.SalesOrderDetail_IndexUsage

--relog /?
--列出输入文件中的性能计数器
relog F:\TroubleShooting\Perfmon\SamplePerfmonLog.blg -q -o F:\TroubleShooting\Perfmon\PerfmonCounters.txt -y
--从输入文件中筛选出计数器
relog F:\TroubleShooting\Perfmon\DataCollector01.blg -c "\Memory\Available MBytes" -o F:\TroubleShooting\Perfmon\logfile.blg -y

--截取某段时间内的计数器到新的文件中
relog F:\TroubleShooting\Perfmon\DataCollector01.blg -b 2014/10/16 14:14:00 -e 2014/10/16 14:15:00 -o F:\TroubleShooting\Perfmon\logfile.blg -y
--转到csv文件中
relog F:\TroubleShooting\Perfmon\DataCollector01.blg -o F:\TroubleShooting\Perfmon\Counters.csv -f csv

--以2*原采样间隔重新收集
relog F:\TroubleShooting\Perfmon\DataCollector02.blg -b 2014/10/16 14:30:00 -e 2014/10/16 14:35:00 -o F:\TroubleShooting\Perfmon\logfile.blg -y -t 2