Peculiar Performance Issue.

Dec 1, 2007

Hi all,

We have a issue with the performance in SQL server database.

Scenario & Issue:
We have delivered a .net application to our client. This application is installed in newly built windows 2003 server.

The client is facing performance issues with the application. When compared with the performance in the development server , the performance of the production server is very poor.

Even when we execute the stored procedures in the backend, the performance is poor in the production server.

Example: A stored procedure that takes 16 seconds in the development server takes 17 minutes for the same parameters. The time remains the same even for HOT execution.

System Info:

Database Version - SQL Server 2005
Database Size - 120 plus GB
OS Platform - Windows 2003
Database Load - 50 users
CPUs - 4
RAM - 8 GB

The OS is Clustered ( failover clustering ).

Points to Note:

1.There is a huge table with 250 million rows ( this table itself takes upto 60 GB )

2.The huge table is partitioned ( SQL server 2005 table partitioning ) and placed in 20 different filegroups (.mdfs).

3.The .mdf's are placed in a SAN and .ldf is in local HD

4.Dynamic queries are used at few instances for performance benefits.

Questions:

1. Any thoughts on why this kind of performance issue arises ?

2. The client DBA wants us to clear the data and stored procedure cache before executing the stored procedure and test the performance.

Will this be would be the case in production scenario ?

3. Will the performance change based on the input parameters ?

4. The client DBA also have stated that a report server that pings the production database server is the cause for frequent clearing of the SQL Server cache.

When does the SQL Server database actually clears the cache memory? Is there any way to control it?

Any help would be highly appreciated.

Thanks & Regards,

Hariarul

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Peculiar Performance Issue.

Dec 1, 2007

Hi all,

We have a issue with the performance in SQL server database.

Scenario & Issue:
We have delivered a .net application to our client. This application is installed in newly built windows 2003 server.

The client is facing performance issues with the application. When compared with the performance in the development server , the performance of the production server is very poor.

Even when we execute the stored procedures in the backend, the performance is poor in the production server.

Example: A stored procedure that takes 16 seconds in the development server takes 17 minutes for the same parameters. The time remains the same even for HOT execution.

System Info:

Database Version - SQL Server 2005
Database Size - 120 plus GB
OS Platform - Windows 2003
Database Load - 50 users
CPUs - 4
RAM - 8 GB

The OS is Clustered ( failover clustering ).

Points to Note:

1.There is a huge table with 250 million rows ( this table itself takes upto 60 GB )

2.The huge table is partitioned ( SQL server 2005 table partitioning ) and placed in 20 different filegroups (.mdfs).

3.The .mdf's are placed in a SAN and .ldf is in local HD

4.Dynamic queries are used at few instances for performance benefits.

Questions:

1. Any thoughts on why this kind of performance issue arises ?

2. The client DBA wants us to clear the data and stored procedure cache before executing the stored procedure and test the performance.

Will this be would be the case in production scenario ?

3. Will the performance change based on the input parameters ?

4. The client DBA also have stated that a report server that pings the production database server is the cause for frequent clearing of the SQL Server cache.

When does the SQL Server database actually clears the cache memory? Is there any way to control it?

Any help would be highly appreciated.


Please let me know if you have any questions.

Thanks & Regards,

DBLearner

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Simple (peculiar ) Performance Issue.

Apr 4, 2007



Hi all,



When I execute a SELECT query on a table with around 25 million records, I get
performance difference based on the passed parameter value .



The below queries returns the output in 1 second.



SELECT TOP 10000 * FROM TestTable WHERE Column = 1
SELECT TOP 10000 * FROM TestTable WHERE Column = 2
SELECT TOP 10000 * FROM TestTable WHERE Column = 3



The below query alone takes 18 seconds to return the output.



SELECT TOP 10000 * FROM TestTable WHERE Column = 4



(FYI: The count of records for the column value 4 is lesser than the other column values)



Could anyone please let me know why this happens and how to resolve this ?



Thanks in advance,

DBLearner

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Jun 1, 2007

Hello All,

I am tackling with unique request. I have to download the ".zip" files from the https and uncompress them. Now, the fetch process works fine when I am downloading the files. Using .net and .IO namespaces from system library.

Similarly after downloading I have to uncompress the files as these files are treated by compressed file folders by windows xp. I know it can be achieved by using the IO.compression class form system namespace.
But the only trouble here is IO.compression supports ".gz" and "Gzipstream.Uncompress" and I wonder how I would be able to get the ".zip" and "Zipstream.uncompress" done.

Thanks a million in all your help and advice. Also I appreciate for your time.

Regards
Sandesh

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Jul 26, 2007

SQL Express installation is bombing out with the "A beta version of the .NET Framework 2.0 or SQL Server was detected on the computer...".

From the log file:
Running: PerformSCCAction2 at: 2007/6/26 8:17:27
Loaded DLL:C:WINsystem32msi.dll Version:3.1.4000.2435
Product "{7131646D-CD3C-40F4-97B9-CD9E4E6262EF}" versioned 2.0 is not compatible with current builds of SQL Server.Expected at least version: 2.0.50727.42
The Product Name is ".NET Framework"


Now what is peculiar to me is that
1) this machine should have never had the beta software on it;
2) I have seen people with similar issues except their versioned info always said "versioned 2.0.50727" and the product guid is different, this one only says "2.0"; and
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What is going on here and where is it getting this version information?

brian

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Jul 20, 2005

Hello,I have this peculiar problem concerning MS SQL Server.My company works with an mailing application (ASP) which uses SQLServer as it's repository. What I want to do is send data directlyfrom my own application to this SQL Server in order to feed themailing application.To test if this was possible I linked the tables from SQL Server in MSAccess and entered the data. This worked fine and the data was pickedup correctly by the mailing application.The problem occurs when I send the data from my application (Javaapplication with JDBC connection). The data is in this case no longerpicked up by the application. The strange thing is that the data whichis entered through Access and the data from the Application lookidentical in de database view. The problem also occurs when the datais send with the tool winSQL and when I view the data in here it stilllooks identical.Even more strange is when I select the record which is not working inAccess and copy it into a new record (only changing the key) itsuddenly works!Has anyone have an idea how this can be?Thanks in advance,Sander Janssen.

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Jan 21, 2008

we're trying to get a better understanding of how RS behaves when parameters are being set. We see quirky behavior that is a little difficult to describe. Right now we assume that if the revolving green circle (with the phrase "Report is being generated" beneath it) doesnt appear, the report really wasnt rendered properly, even if the report region changes.

One peculiarity that seems pretty consistent is on reports we've prototyped with "from" and "to" date parameters. It seems that when we set one date (doesnt matter which is 1st) things progress normally, ie no "report clearing event" occurs as a result of setting cursor focus in the calendar control and changing its value. The report region doesnt change from what showed previously. But trying to set focus on 2nd (doesnt matter if its "from" date or "to" date, just that its the 2nd date being set) always seems to trigger some kind of event that 1) doesnt allow focus to be on that text box, 2) blanks out the report region including headings. Only after this "event" occurs, can we set focus on the 2nd date, change the value and click the "view report" button for rerendering.

We see similar types of behavior with other types of parameters that include multi value dropdowns and booleans. The toughest part of this is trying to explain it to our users. On some parameters, the event always occurs every time they are changed. On other parameters, it appears that the event only occurs if another parameter was changed beforehand.

I believe we've even seen headings with no data rendered, thinking temporarily that no rows were returned, just to find out that by clicking the "view report" button there really was data to be reported based on current filters. Unfortunately I cant reproduce this scenario when I want to.

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Rather than the real code, here's a sample we came up with.
 
Here's the C# Code:
public class sptest : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label Label1;
private DataSet dtsData;

private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
string strSP = "sp_testOutput";
SqlParameter[] Params = new SqlParameter[2];
Params[0] = new SqlParameter("@Input", "Pudding");
Params[1] = new SqlParameter("@Error_Text", "");
Params[1].Direction = ParameterDirection.Output;
try
{
this.dtsData = SqlHelper.ExecuteDataset(ConfigurationSettings.AppSettings["SIM_DSN"], CommandType.StoredProcedure, strSP, Params);
Label1.Text = Params[0].Value.ToString() + "--Returned Val is" + Params[1].Value.ToString();
}
//catch (System.Data.SqlClient.SqlException ex)
catch (Exception ex)
{
Label1.Text = ex.ToString();

}
}
 
Here is the stored procedure:
 
CREATE PROCEDURE [user1122500].[sp_testOutput](@Input nvarchar(76),@Error_Text nvarchar(10) OUTPUT)AS
SET @Error_Text = 'Test'GO
When I run this, it prints up the input variable, but not the output variable.

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

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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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Mar 9, 2007

We have the same application installed on a few different environments with similar servers and similar hardward.  The only difference is the versions of SQL and the colations.
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Aug 31, 2007

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I have a following problem with SQL performance:

this line 'select * from [viewUserLatestFee]' executes instantly (in Query Analiser)
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can anyone please help - I seem to have ran out of ideas

I have a feeling people might be curious about the view so here it is:

SELECT dbo.viewUserPosition.id, dbo.viewUserPosition.username, dbo.viewUserPosition.password, dbo.viewUserPosition.title,
dbo.viewUserPosition.firstName, dbo.viewUserPosition.lastName, dbo.viewUserPosition.email, dbo.viewUserPosition.address1,
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dbo.viewLatestPaidFee.startDate, dbo.viewLatestPaidFee.endDate, dbo.viewLatestPaidFee.deleted, dbo.viewLatestPaidFee.feePaidID,
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FROM dbo.viewUserPosition LEFT OUTER JOIN
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Here is viewUserPosition:
SELECT dbo.tblUser.id, dbo.tblUser.username, dbo.tblUser.password, dbo.tblUser.title, dbo.tblUser.firstName, dbo.tblUser.lastName, dbo.tblUser.email,
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dbo.tblRelPosition.positionID
FROM dbo.tblUser INNER JOIN
dbo.tblRelPosition ON dbo.tblUser.id = dbo.tblRelPosition.userID

and viewLatestPaidFee:
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FROM [dbo].[tblRelMshipFeePaid] fp2
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INTO #PlanRev

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INNER JOIN FNFBSDataMart.dbo.tblSuperClientFile tblSuperClientFile WITH (NOLOCK)
ON tblReferral.ClientFileID = tblSuperClientFile.ClientFileID
AND tblSuperClientFile.SuperClientVendorID IN (1816,125,127,1706,766,1820,137,141,144,145,1593,1808,146,990,1745,149,1215,1854,1867)
INNER JOIN FNFBSDataMart.dbo.tblRail tblRail WITH (NOLOCK)
ON tblReferral.RailID = tblRail.RailID
INNER JOIN FNFBSDataMart.dbo.tblVendor tblVendor WITH (NOLOCK)
ON tblReferral.SuperClientVendorID = tblVendor.VendorID
INNER JOIN FNFBSDataMart.dbo.tlkpState tlkpState WITH (NOLOCK)
ON tblSuperClientFile.StateID = tlkpState.StateID
AND (tblSuperClientFile.SuperClientVendorID <> 1820
OR tlkpState.Abbrev NOT IN ('AZ','AK','CA','HI','ID','NV','OR','TX','UT','WA'))
LEFT OUTER JOIN FNFBSDataMart.dbo.tblCloseReason tblCloseReason WITH (NOLOCK)
ON tblReferral.CloseReaID = tblCloseReason.CloseReaID


can anyone have a look at it and give me a feed back asap

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