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Posted by garydevstore on 09/16/05 13:01
Hi,
I have a table defined as
CREATE TABLE [SH_Data] (
[ID] [int] IDENTITY (1, 1) NOT NULL ,
[Date] [datetime] NULL ,
[Time] [datetime] NULL ,
[TroubleshootId] [int] NOT NULL ,
[ReasonID] [int] NULL ,
[reason_desc] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS
NULL ,
[maj_reason_id] [int] NULL ,
[maj_reason_desc] [nvarchar] (255) COLLATE
SQL_Latin1_General_CP1_CS_AS NULL ,
[ActionID] [int] NULL ,
[action_desc] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS
NULL ,
[WinningCaseTitle] [nvarchar] (255) COLLATE
SQL_Latin1_General_CP1_CS_AS NULL ,
[Duration] [int] NULL ,
[dm_version] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS
NULL ,
[ConnectMethod] [nvarchar] (255) COLLATE
SQL_Latin1_General_CP1_CS_AS NULL ,
[dm_motive] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS
NULL ,
[HnWhichWlan] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS
NULL ,
[RouterUsedToConnect] [nvarchar] (255) COLLATE
SQL_Latin1_General_CP1_CS_AS NULL ,
[OS] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS NULL ,
[WinXpSp2Installed] [nvarchar] (255) COLLATE
SQL_Latin1_General_CP1_CS_AS NULL ,
[Connection] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS
NULL ,
[Login] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS NULL
,
[EnteredBy] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS
NULL ,
[Acct_Num] [int] NULL ,
[Site] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CS_AS NULL ,
CONSTRAINT [PK_SH_Data] PRIMARY KEY CLUSTERED
(
[TroubleshootId]
) ON [PRIMARY]
) ON [PRIMARY]
GO
Which contains 5.6 Million rows and has non clustered indexes on Date,
ReasonID, maj_Reason, Connection. Compared to other tables on the same
server this one is extremely slow. A simple query such as :
SELECT
SD.reason_desc,
SD.Duration,
SD.maj_reason_desc,
SD.[Connection],
SD.aolEnteredBy
FROM dbo.[Sherlock Data] SD
Where SD.[Date] > Dateadd(Month,-2,Getdate())
takes over 2 minutes to run ! I realise the table contains several
large columns which make the table quite large but unfortunately this
cannot be changed for the moment.
How can i assess what is causing the length of Query time ? And what
could i possibly do to speed this table up ? The database itself is
running on a dedicated server which has some other databases. None of
which have this performance issue.
Anyone have any ideas ?
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