MS SQL Server :: Index Performance Tuning Help

Performance Tuning Using Index. How To Force The Query Engine To Use It?

Nov 14, 2007

Hello all.
I have the following table

Create Table Item(
I_AssetCode NVarChar(40) Primary Key NOT NULL,
I_Name NVarChar(160),
I_BC nvarchar(20),
I_Company nvarchar(20)
);

Create Index ind_Item_Name on Item(I_Name);
Create Index ind_Item_BC on Item(I_BC);
Create Index ind_Item_Company on Item(I_Company);

It is populated with 50 000 records.
Searching on indexed columns is fast, but I've run into the following problem:
I need to get all distinct companies in the table.
I've tried with these two queries, but they both are very slow!

1. "select I_Company from item group by I_Company " - This one takes 19 seconds

2. "select distinct(I_Company) from item" -This one takes 29 secons

When I ran them through the SQL Management Studio and checked the performance plan, I saw that the second one doesn't use index at all ! So I focused on the first...
The first one used index (it took it 15% of the time), but then it ran the "stream aggregate" which took 85% of the time !
Actully 15% of 19 seconds - about 2 seconds is pretty much enough for me. But it looks that aggregate function is run for nothing!
So is it possible to force the query engine of the SSCE not to run it, since there is actually no aggregate functions in my select clause?
According to SQL CE Books online:
Group By

"Specifies the groups (equivalence classes) that output rows are to be placed in. If aggregate functions are included in the SELECT clause <select list>, the GROUP BY clause calculates a summary value for each group."
It seems the aggregate is run every time, not only when there is an aggregate function.

Is this a bug?

Thanks in advance,
TipoMan

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my query is :-

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QPDMADM.LAR_OMEGA_TRANS_SUM.SOURCE_TRANSACTION_ID,
QPDMADM.LAR_OMEGA_TRANS_SUM.ORDER_DATE,
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FROM
QPDMADM.LAR_OMEGA_TRANS_SUM
WHERE
(
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)
GROUP BY
QPDMADM.LAR_OMEGA_TRANS_SUM.SOURCE_TRANSACTION_ID,
QPDMADM.LAR_OMEGA_TRANS_SUM.ORDER_DATE,
QPDMADM.LAR_OMEGA_TRANS_SUM.SHIP_DATE,
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QPDMADM.LAR_OMEGA_TRANS_SUM.INDUSTRY_CLUSTER_CODE,
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Thank & Regards,
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Code Snippet

IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[usp_MyProc]') AND type in (N'P', N'PC'))
DROP PROCEDURE [dbo].[usp_MyProc]
GO

CREATE PROCEDURE [dbo].[usp_MyProc]
@Dob DATETIME = NULL,
@CtrlWorkerNo NVARCHAR(20) = NULL,
@Factory NVARCHAR(MAX) = NULL,
@Position VARCHAR(25) = NULL,
@Gender NVARCHAR(10) = NULL,
@Year uniqueidentifier = NULL,
@FamilyName NVARCHAR(50) = NULL,
@GivenNames NVARCHAR(50) = NULL,
@FirstRow INT = NULL,
@MaxRows INT = NULL,
@IsWorker INT = NULL,
@IsAcStaff INT = NULL,
@Order NVARCHAR(255) = 'FamName , FirstName , DOB',
@RegisterStatus NVARCHAR(255) = NULL,
@PersonGuid VARCHAR(36) = NULL,
@IncludeStarted BIT = 0,
@IncludeHistorical BIT = 0,
@IncludeNoRegisters BIT = 0
AS
BEGIN

SET NOCOUNT ON;

CREATE TABLE #t
(Id INT Identity(1,1),EntityId uniqueidentifier)

SELECT @Factory = REPLACE(@Factory,',',''',''')
SELECT @RegisterStatus = REPLACE(@RegisterStatus,',',''',''')

DECLARE @RegisterYears INT
SET @RegisterYears = NULL

IF (@Factory IS NOT NULL )
OR (@Position IS NOT NULL)
OR (@Year IS NOT NULL)
OR (@RegisterStatus IS NOT NULL)
OR (@IsWorker = 1)
BEGIN
SELECT @RegisterYears = (SELECT DATEPART(year, getDate()))
DECLARE @RegisterYearsHistorical INT
SET @RegisterYearsHistorical = (SELECT HistoricalYears FROM Organisation)
IF (@IncludeHistorical = 0 AND @RegisterYearsHistorical IS NOT NULL AND @IsWorker = 1)
BEGIN
SET @RegisterYears = @RegisterYears - @RegisterYearsHistorical
END
ELSE IF (@IncludeHistorical = 1 OR @IsWorker IS NULL OR @IsWorker = 0)
BEGIN
SET @RegisterYears = NULL
END
END

DECLARE @OrderByStatement NVARCHAR(255)
SET @OrderByStatement = @Order
DECLARE @FactoryJoin nvarchar(1000)
SET @FactoryJoin = ''
IF (PATINDEX('%School%', @Order) > 0 OR @Factory IS NOT NULL)
BEGIN
SET @FactoryJoin = 'LEFT OUTER JOIN dbo.Factory AS Factory ON Worker.School = Factory.Code '
SET @OrderByStatement = REPLACE(@OrderByStatement, 'School', 'Factory.Code')
END

DECLARE @AddressJoin nvarchar(1000)
SET @AddressJoin = ''
IF (PATINDEX('%Suburb%', @Order) > 0)
BEGIN
SET @AddressJoin = 'LEFT OUTER JOIN dbo.hjEntityAddress EntityAddress ON Worker.EntityId=EntityAddress.EntityId AND(EntityAddress.AddressType=''Local'' ) ' +
'LEFT OUTER JOIN dbo.hjAddress [Address] ON EntityAddress.AddressId=[Address].AddressId '
SET @OrderByStatement = REPLACE(@OrderByStatement, 'Suburb', '[Address].Suburb')
END

DECLARE @MainContactJoin nvarchar(1000)
SET @MainContactJoin = ''
IF (PATINDEX('%MainContact%', @Order) > 0)
BEGIN
IF (PATINDEX('%DESC%', @Order) > 0)
BEGIN
SET @Order = REPLACE(@Order, ',MainContact', ' DESC,MainContact')
SET @OrderByStatement = @Order
END
SET @MainContactJoin = 'LEFT OUTER JOIN dbo.hjRelationship Related ON Person.EntityId = Related.EntityID1 AND Related.MainContact=1 AND Related.Active = 1 ' +
'LEFT OUTER JOIN dbo.hjPerson MainContact ON Related.EntityID2 = MainContact.EntityID '
SET @OrderByStatement = REPLACE(@OrderByStatement, 'MainContact', 'MainContact.')
END

DECLARE @IncNoRegister NVARCHAR(MAX)
SET @IncNoRegister = ''
IF (@IncludeNoRegisters = 0)
BEGIN
SET @IncNoRegister = '
INNER JOIN dbo.Register ON dbo.hjWorker.WorkerNo = dbo.Register.Worker
INNER JOIN dbo.YearTable ON dbo.YearTable.CalendarAcademicYearId = dbo.Register.
CalendarAcademicYearId

WHERE (dbo.Register.Factory IN ('''+ISNULL(@Factory, '')+'''))
AND ((dbo.Register.[CalendarAcademicYearId] = @CalendarAcademicYearId_) OR
(@CalendarAcademicYearId_ IS NULL))
AND ((dbo.Register.Position = @Position_) OR (@Position_ IS NULL))
AND ((DATEPART(yy, dbo.YearTable.StartDate) >= @RegisterYears_) OR (@RegisterYears_ IS
NULL) OR (dbo.YearTable.StartDate IS NULL))
AND ((dbo.Register.RegisterStatus IN ('''+ISNULL(@RegisterStatus, '')+''')) OR (@RegisterStatus_
IS NULL))'
END
ELSE
BEGIN
SET @IncNoRegister = '
LEFT JOIN dbo.Register ON dbo.hjWorker.WorkerNo = dbo.Register.Worker
LEFT JOIN dbo.YearTable ON dbo.YearTable.CalendarAcademicYearId = dbo.Register.
CalendarAcademicYearId

WHERE (dbo.Register.RegisterID IS NULL)
OR
(
((dbo.Register.Factory IN ('''+ISNULL(@Factory, '')+''')) OR (@Factory_ IS NULL) )
AND ((dbo.Register.[CalendarAcademicYearId] = @CalendarAcademicYearId_) OR
(@CalendarAcademicYearId_ IS NULL))
AND ((dbo.Register.Position = @Position_) OR (@Position_ IS NULL))
AND ((DATEPART(yy, dbo.YearTable.StartDate) >= @RegisterYears_) OR (@RegisterYears_ IS
NULL) OR (dbo.YearTable.StartDate IS NULL))
AND ((dbo.Register.RegisterStatus IN ('''+ISNULL(@RegisterStatus, '')+''')) OR (@RegisterStatus_
IS NULL))
)
'

END

DECLARE @StartedClause NVARCHAR(100)
SELECT @StartedClause = ''
IF @IncludeStarted = 0
SELECT @StartedClause = ' (Person.StartedDate IS NULL ) AND '

DECLARE @sql NVARCHAR(MAX)
SELECT @sql = N'
set rowcount ' + convert(varchar,@FirstRow + @MaxRows -1) + '
INSERT INTO #t
SELECT Entity.EntityId
FROM dbo.hjEntity Entity
INNER JOIN dbo.hjPerson Person ON Entity.EntityId=Person.EntityId
LEFT OUTER JOIN dbo.hjWorker Worker ON Worker.EntityId=Entity.EntityId '
+ @FactoryJoin
+ @MainContactJoin
+ @AddressJoin
+ '
WHERE Entity.EntityID IN
(
SELECT dbo.hjEntity.EntityID
FROM dbo.hjEntity
LEFT OUTER JOIN dbo.hjWorker ON dbo.hjWorker.EntityId=dbo.hjEntity.EntityId
' + @IncNoRegister + '
)
AND
(' + @StartedClause + '((Person.IsWorker=@IsWorker_ )OR (@IsWorker_ IS NULL))
AND((Person.IsAcStaff=@IsAcStaff_) OR (@IsAcStaff_ IS NULL))
AND((Person.FamName like @FamilyName_) OR (@FamilyName_ IS NULL) )
AND((Person.FirstName like @GivenNames_) OR (Person.PrefName LIKE @GivenNames_) OR
(Person.SecName LIKE @GivenNames_) OR (@GivenNames_ IS NULL) )
AND((Person.DOB LIKE @Dob_) OR (@Dob_ IS NULL) )
AND((Worker.CtrlWorkerNo like @CtrlWorkerNo_) OR (@CtrlWorkerNo_ IS NULL) )
AND((Person.Gender LIKE @Gender_) OR (@Gender_ IS NULL) )
AND((Person.EntityId != @PersonGuid_) OR (@PersonGuid_ IS NULL) )
) ORDER BY ' + @OrderByStatement

print @sql

EXEC sp_executesql @sql,N'@Factory_ NVARCHAR(10),@CalendarAcademicYearId_ uniqueidentifier,@RegisterStatus_ VARCHAR(50),@IsWorker_ INT,@IsAcStaff_ INT,@FamilyName_ NVARCHAR(50),@GivenNames_ NVARCHAR(50),@Dob_ DATETIME,@CtrlWorkerNo_ NVARCHAR(20),@Gender_ NVARCHAR(10),@PersonGuid_ VARCHAR(36),@FirstRow_ INT, @MaxRows_ INT, @RegisterYears_ INT, @Position_ VARCHAR(25)
',@Dob_=@Dob,@CtrlWorkerNo_=@CtrlWorkerNo,@Factory_=@Factory,@Gender_=@Gender,@CalendarAcademicYearId_=@Year,@RegisterStatus_=@RegisterStatus,@FamilyName_=@FamilyName,@GivenNames_=@GivenNames,@IsWorker_=@IsWorker,@IsAcStaff_=@IsAcStaff,@PersonGuid_=@PersonGuid,@FirstRow_=@FirstRow,@MaxRows_=@MaxRows,@RegisterYears_=@RegisterYears,@Position_=@Position

set rowcount 0

SELECT
Entity.EntityId,
Person.Title,
Person.FamName,
Person.FirstName,
Person.SecName,
Person.PrefName,
Person.DOB,
Person.Gender,
Person.EmploymentType,
Person.HighestSchoolLevel,
Person.HighestQualificationLevel,
Worker.School,
Factory.Name as SchoolName,
Worker.CtrlWorkerNo,
[Address].StreetNumber,
[Address].Street1,
[Address].Street2,
[Address].Suburb,
[Address].City,
[Address].State,
[Address].Postcode,
[Address].Country,
RelPerson.FamName as MainContactFamName,
RelPerson.FirstName as MainContactFirstName,
RelPerson.SecName as MainContactSecName,
RelPerson.PrefName as MainContactPrefName,
RelPerson.Title as MainContactTitle,
(SELECT COUNT(dbo.hjContactMethod.ContactMethodID) FROM dbo.hjContactMethod WHERE Worker.EntityId=dbo.hjContactMethod.EntityId AND(dbo.hjContactMethod.Priority='1' )) as ContactMethods,
Person.StartedDate
FROM dbo.hjEntity Entity
INNER JOIN #t t on Entity.EntityId = t.EntityId
INNER JOIN dbo.hjPerson Person ON Entity.EntityId=Person.EntityId
LEFT OUTER JOIN dbo.hjWorker Worker ON Worker.EntityId=Entity.EntityId
LEFT OUTER JOIN dbo.hjRelationship Relationship ON Worker.EntityId=Relationship.EntityId1 AND(Relationship.MainContact=1 )
LEFT OUTER JOIN dbo.hjEntity RelEntity ON Relationship.EntityId2=RelEntity.EntityId
LEFT OUTER JOIN dbo.hjPerson RelPerson ON RelEntity.EntityId=RelPerson.EntityId
LEFT OUTER JOIN dbo.hjEntityAddress EntityAddress ON Entity.EntityId=EntityAddress.EntityId AND(EntityAddress.AddressType='Local' )
LEFT OUTER JOIN dbo.hjAddress [Address] ON EntityAddress.AddressId=[Address].AddressId
LEFT OUTER JOIN dbo.Factory ON Factory.Code = Worker.School

WHERE (t.Id BETWEEN @FirstRow AND (@FirstRow + @MaxRows -1))
Order by t.Id

END

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