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select statement is too slow Expand / Collapse
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Posted Monday, February 11, 2013 11:47 PM
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Hi,

I have 81 columns in my table. and record count=6690237. clustered index is been applied on PK.

when i execute below select statement it is taking 3 min to process.

select distinct divCode
,convert(varchar(4),glPeriodYear) + '/' + right('00' + convert(varchar(2),glPeriodMonth),2) + '/' + '01' as glPeriod
from tblGLJnlEntrySum
where divCode = @vsDivCode
order by divCode,glPeriod desc

Please tell me how i can speed up my query. need some suggestion on performance tuning.
Post #1418763
Posted Tuesday, February 12, 2013 12:49 AM


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Please post table definitions, index definitions and execution plan, as per http://www.sqlservercentral.com/articles/SQLServerCentral/66909/

Is the distinct really necessary?



Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #1418775
Posted Tuesday, February 12, 2013 3:02 AM
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Table Creation


/****** Object: Table [dbo].[tblGLJnlEntrySum] Script Date: 02/12/2013 04:55:15 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[tblGLJnlEntrySum](
[BatchID] [bigint] NOT NULL,
[RecID] [bigint] NOT NULL,
[GLBatchID] [bigint] NOT NULL,
[GLRecID] [bigint] IDENTITY(1,1) NOT NULL,
[DivCode] [varchar](3) NOT NULL,
[DivName] [varchar](50) NOT NULL,
[CurrencyID] [varchar](3) NOT NULL,
[GLAcctNbrP1] [varchar](30) NOT NULL,
[GLAcctNbrP2] [varchar](30) NULL,
[GLAcctNbrP3] [varchar](30) NULL,
[GLAcctNbrP4] [varchar](30) NULL,
[GLAcctNbrP5] [varchar](30) NULL,
[GrpGLAcctNbr] [varchar](255) NOT NULL,
[GrpGLAcctType] [varchar](2) NULL,
[AcctPeriod] [varchar](2) NOT NULL,
[AcctYear] [varchar](4) NOT NULL,
[AcctBalance] [money] NULL,
[ProcessedDate] [datetime] NULL,
[ProcessedFlag] [bit] NOT NULL,
[GPProcessID] [bigint] NULL,
[GPBatchID] [char](15) NULL,
[GPErrorFlag] [int] NULL,
[GPDatabase] [varchar](60) NULL,
[CreatedDate] [datetime] NOT NULL,
[CreatedUser] [varchar](255) NOT NULL,
[UpdatedDate] [datetime] NULL,
[UpdatedUser] [varchar](255) NULL,
[GLAcctDescP1] [varchar](60) NULL,
[GLAcctDescP2] [varchar](60) NULL,
[GLAcctDescP3] [varchar](60) NULL,
[GLAcctDescP4] [varchar](60) NULL,
[GLAcctDescP5] [varchar](60) NULL,
[GLAcctDesc] [varchar](255) NULL,
[glPeriodYear] [int] NULL,
[glPeriodMonth] [int] NULL,
[glEntityCode] [varchar](50) NULL,
[glEntityDesc] [varchar](100) NULL,
[glAcctCode] [varchar](50) NULL,
[glSubEntityCode] [varchar](50) NULL,
[glSubEntityDesc] [varchar](100) NULL,
[glAcctTypeCode] [varchar](50) NULL,
[glAcctTypeDesc] [varchar](100) NULL,
[flexCode01] [varchar](50) NULL,
[flexDesc01] [varchar](100) NULL,
[flexCode02] [varchar](50) NULL,
[flexDesc02] [varchar](100) NULL,
[flexCode03] [varchar](50) NULL,
[flexDesc03] [varchar](100) NULL,
[flexCode04] [varchar](50) NULL,
[flexDesc04] [varchar](100) NULL,
[flexCode05] [varchar](50) NULL,
[flexDesc05] [varchar](100) NULL,
[flexCode06] [varchar](50) NULL,
[flexDesc06] [varchar](100) NULL,
[flexCode07] [varchar](50) NULL,
[flexDesc07] [varchar](100) NULL,
[flexCode08] [varchar](50) NULL,
[flexDesc08] [varchar](100) NULL,
[flexCode09] [varchar](50) NULL,
[flexDesc09] [varchar](100) NULL,
[flexCode10] [varchar](50) NULL,
[flexDesc10] [varchar](100) NULL,
[glAcctYTDBalance] [money] NULL,
[glAcctMonthDebitAmt] [money] NULL,
[glAcctMonthCreditsAmt] [money] NULL,
[glAcctMonthNetChangeAmt] [money] NULL,
[CurrencyCode] [varchar](3) NULL,
[FileCreateDate] [datetime] NULL,
[grpEntityID] [varchar](2) NULL,
[grpEntityErrorFlag] [varchar](1) NULL,
[grpSubEntityID] [varchar](3) NULL,
[grpSubEntityErrorFlag] [varchar](1) NULL,
[grpGLAcctCode] [varchar](4) NULL,
[grpGLAcctCodeErrorFlag] [varchar](1) NULL,
[grpGLAcctNumberErrorFlag] [varchar](1) NULL,
[recordErrorFlag] [varchar](1) NULL,
[recordSource] [varchar](50) NULL,
[createdBy] [varchar](50) NULL,
[createTimeStamp] [datetime] NULL,
[updatedBy] [varchar](50) NULL,
[updateTimeStamp] [datetime] NULL,
CONSTRAINT [tblGLJnlEntrySum_PK] PRIMARY KEY CLUSTERED
(
[GLRecID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 80) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

ALTER TABLE [dbo].[tblGLJnlEntrySum] WITH NOCHECK ADD CONSTRAINT [FK_tblGLJnlEntrySum_tblDivision_DIM] FOREIGN KEY([DivCode])
REFERENCES [dbo].[tblDivision_DIM] ([DivCode])
GO

ALTER TABLE [dbo].[tblGLJnlEntrySum] CHECK CONSTRAINT [FK_tblGLJnlEntrySum_tblDivision_DIM]
GO

ALTER TABLE [dbo].[tblGLJnlEntrySum] ADD CONSTRAINT [DF_tblGLJnlEntrySum_CurrencyID] DEFAULT ('USD') FOR [CurrencyID]
GO

ALTER TABLE [dbo].[tblGLJnlEntrySum] ADD CONSTRAINT [DF__tblGLJnlE__Proce__703EA55A] DEFAULT ((0)) FOR [ProcessedFlag]
GO

ALTER TABLE [dbo].[tblGLJnlEntrySum] ADD CONSTRAINT [DF__tblGLJnlE__Creat__7132C993] DEFAULT (getdate()) FOR [CreatedDate]
GO

ALTER TABLE [dbo].[tblGLJnlEntrySum] ADD CONSTRAINT [DF__tblGLJnlE__Creat__7226EDCC] DEFAULT (suser_sname()) FOR [CreatedUser]
GO

ALTER TABLE [dbo].[tblGLJnlEntrySum] ADD CONSTRAINT [DF_tblGLJnlEntrySum_createdBy] DEFAULT (suser_sname()) FOR [createdBy]
GO

ALTER TABLE [dbo].[tblGLJnlEntrySum] ADD CONSTRAINT [DF_tblGLJnlEntrySum_createTimeStamp] DEFAULT (getdate()) FOR [createTimeStamp]
GO


Trigger used on top of table

/****** Object: Trigger [dbo].[tblGLJnlEntrySum_TRU01] Script Date: 02/12/2013 04:56:18 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TRIGGER [dbo].[tblGLJnlEntrySum_TRU01]
ON [dbo].[tblGLJnlEntrySum]
FOR UPDATE
AS
BEGIN
update tblGLJnlEntrySum
set UpdatedDate = getdate(),
UpdatedUser = IsNull(deleted.UpdatedUser,suser_sname())
from deleted
where tblGLJnlEntrySum.GLRecID = deleted.GLRecID
END

GO

Indexes


/****** Object: Index [IX_tblGLJnlEntrySum] Script Date: 02/12/2013 04:57:26 ******/
CREATE NONCLUSTERED INDEX [IX_tblGLJnlEntrySum] ON [dbo].[tblGLJnlEntrySum]
(
[DivCode] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 80) ON [PRIMARY]
GO

USE [dbSDUSAReporting]
GO

/****** Object: Index [tblGLJnlEntrySum_IX01] Script Date: 02/12/2013 04:58:33 ******/
CREATE NONCLUSTERED INDEX [tblGLJnlEntrySum_IX01] ON [dbo].[tblGLJnlEntrySum]
(
[DivCode] ASC,
[GLAcctNbrP1] ASC,
[AcctPeriod] ASC,
[AcctYear] ASC,
[AcctBalance] ASC
)
INCLUDE ( [GLAcctNbrP2],
[GLAcctNbrP3],
[GLAcctNbrP4],
[GLAcctNbrP5]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 80) ON [PRIMARY]
GO


USE [dbSDUSAReporting]
GO

/****** Object: Index [tblGLJnlEntrySum_IX02] Script Date: 02/12/2013 04:58:56 ******/
CREATE NONCLUSTERED INDEX [tblGLJnlEntrySum_IX02] ON [dbo].[tblGLJnlEntrySum]
(
[DivCode] ASC,
[AcctYear] ASC,
[AcctPeriod] ASC,
[GrpGLAcctNbr] ASC,
[GLAcctNbrP1] ASC,
[GLRecID] ASC,
[CurrencyID] ASC,
[AcctBalance] ASC
)
INCLUDE ( [GLAcctNbrP2],
[GLAcctNbrP3],
[GLAcctNbrP4],
[GLAcctNbrP5],
[GrpGLAcctType],
[GLAcctDescP1],
[GLAcctDescP2],
[GLAcctDescP3],
[GLAcctDescP4],
[GLAcctDescP5]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 80) ON [PRIMARY]
GO


USE [dbSDUSAReporting]
GO

/****** Object: Index [tblGLJnlEntrySum_PK] Script Date: 02/12/2013 04:59:14 ******/
ALTER TABLE [dbo].[tblGLJnlEntrySum] ADD CONSTRAINT [tblGLJnlEntrySum_PK] PRIMARY KEY CLUSTERED
(
[GLRecID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 80) ON [PRIMARY]
GO



Post #1418826
Posted Tuesday, February 12, 2013 3:13 AM


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Execution plan please.


Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #1418827
Posted Tuesday, February 12, 2013 3:42 AM


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Also what other indexes do you have on the tables asside from the Primary Keys?



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Post #1418847
Posted Tuesday, February 12, 2013 4:55 AM
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Execution plan

Cost
select 0%
Parallelism(Gather Streams) 0%
Sort(Distinct Sort) 0%
Parallelism(Repartition Streams) 0%
Hash Match(Partial Aggregate) 3%
Compute Scalar 0%
Clustered Index Scan[tblGLJnlEntrySum].tblGLJnlEntrySum_PK 97%

Inaddition i am getting message like below
/*
Missing Index Details
The Query Processor estimates that implementing the following index could improve the query cost by 97.4146%.
*/

/*
CREATE NONCLUSTERED INDEX [<Name of Missing Index, sysname,>]
ON [dbo].[tblGLJnlEntrySum] ([DivCode])
INCLUDE ([glPeriodYear],[glPeriodMonth])
*/


so is that means that i have to create suc index mentioned above?
Post #1418880
Posted Tuesday, February 12, 2013 5:06 AM


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p.panneerselvam (2/12/2013)
Execution plan

Cost
select 0%
Parallelism(Gather Streams) 0%
Sort(Distinct Sort) 0%
Parallelism(Repartition Streams) 0%
Hash Match(Partial Aggregate) 3%
Compute Scalar 0%
Clustered Index Scan[tblGLJnlEntrySum].tblGLJnlEntrySum_PK 97%

Inaddition i am getting message like below
/*
Missing Index Details
The Query Processor estimates that implementing the following index could improve the query cost by 97.4146%.
*/

/*
CREATE NONCLUSTERED INDEX [<Name of Missing Index, sysname,>]
ON [dbo].[tblGLJnlEntrySum] ([DivCode])
INCLUDE ([glPeriodYear],[glPeriodMonth])
*/


so is that means that i have to create suc index mentioned above?


The suggested index should improve your query yes. At the moment, SQL Server is having to scan the entire table looking for records where divCode = @vsDivCode. With the new index and included columns the scan should become an index seek on the new indexed column.


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Post #1418887
Posted Tuesday, February 12, 2013 5:19 AM
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Hi,

my issue got fixed with the help of excution plan. i was missing required non-clustered index on top of my table.

Thanks
Post #1418891
Posted Tuesday, February 12, 2013 6:54 AM


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I take it you didn't read the article I referenced, as it shows how to save and attach the graphical plan.

Also, please post SQL 2008 questions in the SQL 2008 forums.



Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Post #1418934
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