Count(*) Performance

Apr 21, 2008

Hello,

I have a simple count(*) query on tableA that takes 1:30 min.
The table has a pk defined and there are only 250k records.

I have already tried count(1) which takes same amount of time.

What influences count(*) performance?

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Performance -- Count(*)

Jul 23, 2005

I need to update the columns to blanks if it has Nulls; Most of thetime we do not have Nulls and to check that in a 3.2 million table ittakes 2 minutes and 45 seconds. (To do select count(*) from <table>where <columnname> is Null) .I just cut and pasted a part from my stored procedure:EXEC ('IF (SELECT COUNT (*) FROM ' + @tblname + ' WHERE '+@columnname + ' is Null ) >0BEGINPRINT ''' + @columnName + ' has Null ''' +' UPDATE ' + @tblname +' SET ' + @columnName + ' = ''''WHERE ' + @columnName + ' is NullPRINT ''Updated ''END'Please let me know if there is a better way to do instead of doingcount (*).Thanks in advance!

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Improving Count(*) Performance

Feb 24, 2008

Hi guys,

I'm facing a performance issue with select count(*) table_name when performing pagination to my results. My actualy query joins 4 tables with proper PK and FK contrainsts and indices applied.



select top 100 * from table1
left outer join table2 on tid=rid
left outer join table3 on tid=aid
inner join shipment on sid=sid
where datetime>=convert(datetime,'20070810 00:00:00') and datetime<=convert(datetime,'20070920 23:59:59')

The query above takes 200 ms to 600 ms to execute.


select count(*) from table1
left outer join table2 on tid=rid
left outer join table3 on tid=aid
inner join shipment on sid=sid
where datetime>=convert(datetime,'20070810 00:00:00') and datetime<=convert(datetime,'20070920 23:59:59')

The query above takes 2000ms to 4000 ms to run.



The total records that fulfill the where clause is approximately 5000 to 6000 records. I checked the execution plan but found that the server is actually utilizing the indices with operations like index scan and index seek.

Are there any other things that i can do to improve the counting of total records?



Thanks.

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How To Count Distinct Members And Keep Good Performance

Mar 26, 2007

Hi all,

I have a simple cube with only one measure : "Amount", I have three dimensions Supplier, Category and Company.

I would like to display a matrix with Categories as rows, company as columns, the amount and the number of distinct suppliers who appaers for each category/company.

I tried to create a calculated measure like this:

Count(Crossjoin({[D Supplier].[Supplier Code].members}, {[Measures].[Amount]}), EXCLUDEEMPTY)

The result is OK, but when I add this calculated Measure to my query the execution time jumps from a few seconds (<10) to a few minutes. Am I missing something ?

Anyone have an idea to do this in a better way ?

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Strange Performance Problem With SELECT COUNT(1) And Sp_executesql

Feb 22, 2008

Hello,

I have the following queries that run on a view called EntrySummary:

1)

exec sp_executesql N'SELECT COUNT (1) FROM [dbo].[EntrySummary] WHERE [EntrySummary].[SubmissionStatusID] = @SubmissionStatusID0 AND [EntrySummary].[CreatedBy] = @CreatedBy1',N'@SubmissionStatusID0 int,@CreatedBy1 nvarchar(20)',@SubmissionStatusID0=4,@CreatedBy1=N'domainaperson'


2)
exec sp_executesql N'SELECT COUNT (1) FROM [dbo].[EntrySummary] WHERE [EntrySummary].[CreatedBy] = @CreatedBy1 AND [EntrySummary].[SubmissionStatusID] = @SubmissionStatusID0',N'@SubmissionStatusID0 int,@CreatedBy1 nvarchar(20)',@SubmissionStatusID0=4,@CreatedBy1=N'domainaperson'


(The only difference between the two queries being the order of the where clauses)

Both return the correct answer (4144), but Query 2 takes 10-15 seconds whereas Query 1 takes < second.
If the same query is resubmitted several times, this doesn't affect the times.

(The vast majority of the records have a status of 4, but only about 3% will be created by the person).

Replacing Count(1) with count(*) makes both queries return quickly.

Is sp_executesql creating poor execution plans ? Can anyone explain this behaviour?


Regards,
AndyM

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Transaction Count After EXECUTE Indicates That A COMMIT Or ROLLBACK TRANSACTION Statement Is Missing. Previous Count = 1, Current Count = 0.

Aug 6, 2006

With the function below, I receive this error:Error:Transaction count after EXECUTE indicates that a COMMIT or ROLLBACK TRANSACTION statement is missing. Previous count = 1, current count = 0.Function:Public Shared Function DeleteMesssages(ByVal UserID As String, ByVal MessageIDs As List(Of String)) As Boolean        Dim bSuccess As Boolean        Dim MyConnection As SqlConnection = GetConnection()        Dim cmd As New SqlCommand("", MyConnection)        Dim i As Integer        Dim fBeginTransCalled As Boolean = False
        'messagetype 1 =internal messages        Try            '            ' Start transaction            '            MyConnection.Open()            cmd.CommandText = "BEGIN TRANSACTION"            cmd.ExecuteNonQuery()            fBeginTransCalled = True            Dim obj As Object            For i = 0 To MessageIDs.Count - 1                bSuccess = False                'delete userid-message reference                cmd.CommandText = "DELETE FROM tblUsersAndMessages WHERE MessageID=@MessageID AND UserID=@UserID"                cmd.Parameters.Add(New SqlParameter("@UserID", UserID))                cmd.Parameters.Add(New SqlParameter("@MessageID", MessageIDs(i).ToString))                cmd.ExecuteNonQuery()                'then delete the message itself if no other user has a reference                cmd.CommandText = "SELECT COUNT(*) FROM tblUsersAndMessages WHERE MessageID=@MessageID1"                cmd.Parameters.Add(New SqlParameter("@MessageID1", MessageIDs(i).ToString))                obj = cmd.ExecuteScalar                If ((Not (obj) Is Nothing) _                AndAlso ((TypeOf (obj) Is Integer) _                AndAlso (CType(obj, Integer) > 0))) Then                    'more references exist so do not delete message                Else                    'this is the only reference to the message so delete it permanently                    cmd.CommandText = "DELETE FROM tblMessages WHERE MessageID=@MessageID2"                    cmd.Parameters.Add(New SqlParameter("@MessageID2", MessageIDs(i).ToString))                    cmd.ExecuteNonQuery()                End If            Next i
            '            ' End transaction            '            cmd.CommandText = "COMMIT TRANSACTION"            cmd.ExecuteNonQuery()            bSuccess = True            fBeginTransCalled = False        Catch ex As Exception            'LOG ERROR            GlobalFunctions.ReportError("MessageDAL:DeleteMessages", ex.Message)        Finally            If fBeginTransCalled Then                Try                    cmd = New SqlCommand("ROLLBACK TRANSACTION", MyConnection)                    cmd.ExecuteNonQuery()                Catch e As System.Exception                End Try            End If            MyConnection.Close()        End Try        Return bSuccess    End Function

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Analysis :: Count Function Taking More Time To Get Count From Parent Child Dimension?

May 25, 2015

below data,

Countery
parentid
CustomerSkId
sales

A
29097
29097
10

A
29465
29465
30

A
30492
30492
40

[code]....
 
Output

Countery
parentCount

A
8

B
3

c
3

in my count function,my code look like,

 set buyerset as exists(dimcustomer.leval02.allmembers,custoertypeisRetailers,"Sales")
set saleset(buyerset)
set custdimensionfilter as {custdimensionmemb1,custdimensionmemb2,custdimensionmemb3,custdimensionmemb4}
set finalset as exists(salest,custdimensionfilter,"Sales")
Set ProdIP as dimproduct.dimproduct.prod1
set Othersset as (cyears,ProdIP)
(exists(([FINALSET],Othersset,dimension2.dimension2.item3),[DimCustomerBuyer].[ParentPostalCode].currentmember, "factsales")).count

it will take 12 to 15 min to execute.

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Jul 3, 2013

I am trying to get count on a varchar field, but it is not giving me distinct count. How can I do that? This is what I have....

Select Distinct
sum(isnull(cast([Total Count] as float),0))

from T_Status_Report
where Type = 'LastMonth' and OrderVal = '1'

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Sep 12, 2004

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above, which way would be faster and get a better performance?

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Jun 23, 2006

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In SQL 2000 Can I Use Count() To Count A Column?

Nov 26, 2007

I use SQL 2000
I have a Column named Bool , the value in this Column is  0ã€?0ã€?1ã€?1ã€?1
I no I can use Count() to count this column ,the result would be "5"
but what I need is  "2" and "3" and then I will show "2" and "3" in my DataGrid
as the True is  2 and False is 3
the Query will have some limited by a Where Query.. but first i need to know .. how to have 2 result count
could it be done by Count()? please help.  
thank you very much
 

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Jul 23, 2005

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Aug 21, 2007

The following query returns a value of 0 for the unit percent when I do a count/subquery count. Is there a way to get the percent count using a subquery? Another section of the query using the sum() works.

Here is a test code snippet:


--Test Count/Count subquery

declare @Date datetime

set @date = '8/15/2007'


select
-- count returns unit data
Count(substring(m.PTNumber,3,3)) as PTCnt,
-- count returns total for all units

(select Count(substring(m1.PTNumber,3,3))

from tblVGD1_Master m1

left join tblVGD1_ClassIII v1 on m1.SlotNum_ID = v1.SlotNum_ID

Where left(m1.PTNumber,2) = 'PT' and m1.Denom_ID <> 9

and v1.Act = 1 and m1.Active = 1 and v1.MnyPlyd <> 0

and not (v1.MnyPlyd = v1.MnyWon and v1.ActWin = 0)

and v1.[Date] between DateAdd(dd,-90,@Date) and @Date) as TotalCnt,
-- attempting to calculate the percent by PTCnt/TotalCnt returns 0
(Count(substring(m.PTNumber,3,3)) /

(select Count(substring(m1.PTNumber,3,3))

from tblVGD1_Master m1

left join tblVGD1_ClassIII v1 on m1.SlotNum_ID = v1.SlotNum_ID

Where left(m1.PTNumber,2) = 'PT' and m1.Denom_ID <> 9

and v1.Act = 1 and m1.Active = 1 and v1.MnyPlyd <> 0

and not (v1.MnyPlyd = v1.MnyWon and v1.ActWin = 0)

and v1.[Date] between DateAdd(dd,-90,@Date) and @Date)) as AUPct
-- main select

from tblVGD1_Master m

left join tblVGD1_ClassIII v on m.SlotNum_ID = v.SlotNum_ID

Where left(m.PTNumber,2) = 'PT' and m.Denom_ID <> 9

and v.Act = 1 and m.Active = 1 and v.MnyPlyd <> 0

and not (v.MnyPlyd = v.MnyWon and v.ActWin = 0)

and v.[Date] between DateAdd(dd,-90,@Date) and @Date

group by substring(m.PTNumber, 3,3)

order by AUPct Desc


Thanks. Dan

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Jun 22, 2006

Hello Everyone,I have a very complex performance issue with our production database.Here's the scenario. We have a production webserver server and adevelopment web server. Both are running SQL Server 2000.I encounted various performance issues with the production server witha particular query. It would take approximately 22 seconds to return100 rows, thats about 0.22 seconds per row. Note: I ran the query insingle user mode. So I tested the query on the Development server bytaking a backup (.dmp) of the database and moving it onto the devserver. I ran the same query and found that it ran in less than asecond.I took a look at the query execution plan and I found that they we'rethe exact same in both cases.Then I took a look at the various index's, and again I found nodifferences in the table indices.If both databases are identical, I'm assumeing that the issue isrelated to some external hardware issue like: disk space, memory etc.Or could it be OS software related issues, like service packs, SQLServer configuations etc.Here's what I've done to rule out some obvious hardware issues on theprod server:1. Moved all extraneous files to a secondary harddrive to free up spaceon the primary harddrive. There is 55gb's of free space on the disk.2. Applied SQL Server SP4 service packs3. Defragmented the primary harddrive4. Applied all Windows Server 2003 updatesHere is the prod servers system specs:2x Intel Xeon 2.67GHZTotal Physical Memory 2GB, Available Physical Memory 815MBWindows Server 2003 SE /w SP1Here is the dev serers system specs:2x Intel Xeon 2.80GHz2GB DDR2-SDRAMWindows Server 2003 SE /w SP1I'm not sure what else to do, the query performance is an order ofmagnitude difference and I can't explain it. To me its is a hardware oroperating systemrelated issue.Any Ideas would help me greatly!Thanks,Brian T

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Jun 25, 2007

Hi all



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Rows count rows has been inserted on the table 59,123,019 mill

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Aug 28, 2007

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Mar 20, 2004

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and

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I can count the events remaining in the month manually with this query (today being March 20):

SELECT Count(EventID) AS [Left for Month],
FROM RECalendar
WHERE
(EventTimeBegin >= DATEADD(DAY, 1, (CONVERT(char(10), GETDATE(), 101)))
AND EventTimeBegin < DATEADD(DAY, 12, (CONVERT(char(10), GETDATE(), 101))))

Could anyone provide me with the correct syntax to count the events for the current month before today

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Thank you for your assistance in advance.

Joel

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Feb 26, 2007

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{
SqlConnection connection = new SqlConnection(docShare_ConString);

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Jun 12, 2007

Hi,
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Name

John
John
Raj
John
Raj

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Name       Count


John             3
Raj               2

since no of jone in my table is 3 and number of Raj is 2 .
how to write the query for this ?

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'<%# Eval("Username") %>'
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jay
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What is wrong with this query?

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