Improving Performance Of SqlServer
Mar 28, 2006
hello everyone,
does anyone know some tipps or articles that descripe how the sqlserver 2000 can be improved? i have an application which displays newspapers. the text of the newspapers is saved in db. performance is ok but i have performance-problems when i do a fulltext-search.
1) hardware: p4 xeon double core, 2.4 Ghz, 2 GB Ram
2) number of articles in database: ~ 255.000 Records (betwenn 10 - 400 words each)
3) the database is indexed (i am searching with "CONTAINS" and not with the "LIKE"-keyword)
4) in my query i am searching in 3 columns (title,leadtext,content)
5) results (searching for one word, stopping after 150 Results):
the time to get a result from database lies between 5 to 10 Seconds (Average: 6.77 sec)!
this is the time only for getting the dataset from the sqlserver. the time of manipulating the dataset and binding it to my repeater needs about 15 milliseconds. using a sqldatareader didn't improve the performance. i got the same results.
in future the number of records will be three to five times higher than now. i am afraid that then the user has to wait half a minute to get a result of 150 search hits.
my questions:
Are you having similiar results in your applications? Are this times acceptable?
The SqlServer 2000 (professional) is installed in its default way with the default settings. Are they possiblities to modify this settings for improving performance? Where can i find info about that?
greetings and thx
Klaus
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Feb 19, 2007
Hi,I used SQL Server 2005 on my development machine, and whilst thismachine isn't as powerful as the live server, it does at times seem alittle slower than I would expect. So I've been wondering if there isany way for me to tune the machine so that SQL Server is better able tomake use of the resources? I am using WS2003.Short of tweaking with the actual database, which is still underdevelopment, does anyone have any tips to increase peformance?Thanks,--Dylan Parryhttp://electricfreedom.org | http://webpageworkshop.co.ukProgramming, n: A pastime similar to banging one's headagainst a wall, but with fewer opportunities for reward.
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Sep 23, 2007
I've written a small application that uses a Microsoft Sql Server 2000 Database and Here lately i've been experiencing alot of performance problems with timeouts and data just taking too long to retreive. I was wondering what could i do to help with this.
Details:
My Program i wrote simply takes windows eventlogs and uploads them into a central database in general , i have also build a small asp.net page, where users could write out queries or save them for later use. The program is hitting our servers and it grabs them remotely, inserts into sql one by one, and clears out the logs when finished, it runs one a day, and generates about 12,000 events daily. (mostly login's and logoffs). once it starts it'll take about 2 and a half hours to finish going through everything.
Database Design...
Single Table, about 3.5 million rows now, takes up about 3 gigs of harddrive space.
Column Definitions
Name, Data Type
EventEntryID INT PrimaryKey(Clustered) (Auto-Increment Identity)
Log varchar(300)
Type varchar(300)
Date smalldatetime
Source varchar(300)
Category varchar(300)
Message varchar(8000)
EventID varchar(300)
UserName varchar(300)
Computer varchar(300)I know the database design can probally use some work, but it's hard to do so now b/c of the massive amoutns of data without killing the transaction log.
Computer Specs:
OS: Window Server 2003
Processor: Intel 700 MHz
RAM: 1 GB
I know it's a small server, but this is pretty much the largest thing this server deals with
I've tried to monitor sql with perfmon and sql performance counters and I just don't see much of anything going wrong with it there, so i'm thinking the the hardware isn't an issue, but then again, i'm not very familar with sql.
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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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Sep 20, 2006
I have a varchar(max) field that is on its way to a Term Lookup task, so it requires conversion to DT_NTEXT before it gets there. The conversion is taking a really, really, really long time. In my current example I have about 400 rows. Granted the length of the varchar(max) if I 'select max(len(myColumn))' is approximately 14,000,000 so I understand that I'm moving a lot of data. But I'm on a x64 machine with 4 dual core processors and watching Task Manager I can see that I'm only using 1 core out of 8. Anything I'm missing that can speed this up?
Thanks,
Frank
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Dec 5, 2007
I have a number of complex search stored procedures that use the following syntax to try to simplify the code.
WHERE @SearchParam IS NULL OR SearchCol = @SearchParam
unfortunately it appears that this is really inefficient as far as the database is concerned.
If I run the following query on the AdventureWorks database (SQL Server 2005 with SP2 and fixes up to v3054)
Code Block
SET STATISTICS IO ON
Declare @CustomerID int
SET @CustomerID = 1
SELECT SalesOrderID
FROM Sales.SalesOrderHeader
WHERE @CustomerID IS NULL OR CustomerID = @CustomerID
SELECT SalesOrderID
FROM Sales.SalesOrderHeader
WHERE CustomerID = @CustomerID
Is see that the first select results in 45 logical reads, whereas the second results in only 2 logical reads.
Does anyone have any idea how I can get the benefit of a search procedure that does not have loads of IF blocks, or dynamic SQL without this major performance issue?
Cheers,
Justin
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Aug 15, 2007
We have a table that is 800GB. We are planning to re-build the clustered index on this table to a different filegroup. The new filegroup and files associated with it will sit on a SAN which will have a 1.5TB allocation. Does anyone have any suggestions in regards to how many files to have associated with the filegroup to provide optimal performance? Apparently we could have 3 LUNS (500gb each), so would 1 file on each LUN provide additional performance as opposed to one file on 1 LUN?
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Mar 28, 2000
Hello,
I really need some help here. I am having performance problem with SQL Server 7.0. I am using Visual Basic 6.0 as Front End.
I have the table with 34 columns. I have Clustered index on the table. Table contains more than 26 thousand rows at this point and it is growing very fast.
My problem is that when I connect to this table from my application(to retrieve data) performance is extremely slow. I marked that if I have few rows in my table than performance is not that bad. Please help...
Your help will be appreciated in millions.
Thank You,
Sarika Patel
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Aug 31, 2006
We have developed a mostly-disconnected smart client app written in C# that uses MSDE as a local backing store. With the announcement of SS Ev, we attempted a port of our app over to SS Ev. The port went smoothly, however, the performance has been significantly (very significantly) degraded. Before we being our investigation into the cause of the performance degradation, I thought I might see if anyone has suggestions on where we should look for possible performance issues. Any suggestions?
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Feb 18, 2007
Hi,
I'm using Visual Web Developer Express and Management Studio Express, and my web site is on a shared web hostΒ΄, running SqlServer2000. I'm looking for software that enables me to monitor the server, but is it possible? The only apps I've found (and downloaded and installed and unistalled) so far need administrative rights to the server so they won't work on a shared web host.
All help would be welcome!
Thanks in advance,
Pettrer
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Sep 28, 2007
Hi guys,
I have a performance related question about the DTS package in sqlserver 2000 which i have developed
We have developed a DTS package which will migrate a view 'ATTRITION' from Sqlserver 2000 to an Oracle database.The design of the package is as follows
First step: It checks for the existance of the table 'ATTRITION' in oracle database, if table 'ATTRITION' is not there it will create a table called 'ATTRITION' in the oracle db.If the table 'ATTRITION' is already present in the oracle db,then the table is truncated.
Second step: The view 'ATTRITION' is migrated to Oracle table 'ATTRITION'.
For the migration, i have used a connection object which connects to sqlserver 2000 and for oracle connection i have used another connection object 'Microsoft ODBC driver for oracle' and i have joined both the connection objects with 'Transform data task' task which maps one to one from sqlserver 2000 where view 'ATTRITION' exists with oracle database where Table 'ATTRITION' exists.
Roughly i have around 65000 rows in 'ATTRITION' view of sqlserver 2000 which needs to be migrated.When im running the package on my system it takes around 4 minutes to migrate all the rows but when im running it on the server it takes a lot lot of time more than 1 hour.
The view definition im using has more than 10 tables joined together.But if its a problem of query used in the view,and if i run the view seperately it quickly displays the data hardly takes 1 minute. and even if i run the package on my local pc it doenst take much time.Now my confusion is why its taking soo much time on server.If i create a indexed view then will it solve my problem.Please suggest...
Thanks in advance
REgards
Arvind L
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Apr 25, 2006
Does anyone know how to how to performance case-insensitive search onXML data type in SQLServer 2005? Or I have to convert all the xml datato lower case before I store it?Thanks in advance.John
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Oct 24, 2005
Here's a sample SELECT statement:
SELECT T1.F3
FROM T1 INNER JOIN T2 ON T1.F4 = T2.F4
WHERE
(T1.F1 > @iNum AND T2.F1 > @iNum)
OR
( @iNum2 * (T1.F1 - T2.F1)/(T1.F2 - T2.F2) ) + (T1.F1 - ((T1.F1 - T2.F1)/(T1.F2 - T2.F2) * T1.F2) ) > @INum
As you can see, the second part of the WHERE (after the OR) is much more complicated than the part before the OR. My query would run a lot faster if it tried the first part of the OR and didn't bother with the second part if the first part was satisfied. Is there any way to do this?
Thanks!
Tyler
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May 16, 2007
Hi all,
My colleague and I are having some difficulties regarding the speed of a LIKE query on our intranet system. Please see the quote below as posted on another SQL forum (To which no one has responded yet ).
Quote: Howdy,
I've taken control of an SQL Database with an ASP front end. The CPU usage of the SQL Server process periodically jumps up to between 75-99%. I've managed to identify the ASP page that is causing it and it's a search page.
It's basically doing something like this:
SELECT JobNumber, CustomerName, CustomerAddress, CustomerPostCode
FROM Customers
WHERE CustomerName LIKE '%query%'
OR CustomerAddress LIKE '%query%'
OR CustomerPostCode LIKE '%query%'
Where query is the value the user has searched on.
The CustomerName and CustomerPostCode fields are varchar fields, but the CustomerAddress field is a text field.
I know if I replace the CustomerAddress text field with a series of varchar fields then I could make them non-clustered indexes, but would this help speed things up with a LIKE query?
There's a lot of work required on the ASP side if I'm going to split the field out, so I only want to do it if I'm gonna get a significant benefit from doing it.
Failing this, is there a better way of performing a search like this?
Any help is much appreciated,
Thanks!
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Nov 4, 2006
All:
I am presently tasked with improving the performance of a chatty application. What I mean by a chatty application is that the application makes multiple calls to the database server for each user request. In many cases it appears that many of the windows are making multiple calls to the database for the population of dialog boxes. In a couple of cases there are more than 10 dialog boxes that are populated similar to this.
To me this is kind of an "old issue", but my response is (1) cache the dialog information as much as possible and (2) make one call to the database to return all of this data for the dialog boxes if it is not cached. For update calls again make a single call to the database rather than making a call for each individual row of a table that is updated.
I admit that some of this will complicate the code of the application; however, my perspective is that I am supposed to look at this from the database perspective and not from the perspective of "programmer convenience." There will be times in which something that would otherwise get to hairy for a programmer will dictate an additional trip to the server, but this should not normally be the case.
What else do I need to consider?
Dave
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Oct 26, 2007
Does any one know of any good components I can buy in to sit on top of my SQL Server to provide the kind of search functionality that google has - 'Did you mean...,' nearset match etc. I have set up SQL Server Full Text but to build all the extra functionality will take some time and I think it will be more cost effective to buy a component in. If any one has used any could you let me know of you experinces please. CheersScott
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Feb 4, 2008
Is there a configuration or a trick to improve the speed of the access to inserted and deleted tables whithin a trigger? Whenever a trigger is called, the access to inserted or deleted constitute approximatly 95% of the execution time.
Is there a way to have access to inserted and to deleted improved other than copying the data to another table?
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Sep 28, 2007
Hi guys,
I have a performance related question about the DTS package in sqlserver 2000 which i have developed
We have developed a DTS package which will migrate a view 'ATTRITION' from Sqlserver 2000 to an Oracle database.The design of the package is as follows
First step: It checks for the existance of the table 'ATTRITION' in oracle database, if table 'ATTRITION' is not there it will create a table called 'ATTRITION' in the oracle db.If the table 'ATTRITION' is already present in the oracle db,then the table is truncated.
Second step: The view 'ATTRITION' is migrated to Oracle table 'ATTRITION'.
For the migration, i have used a connection object which connects to sqlserver 2000 and for oracle connection i have used another connection object 'Microsoft ODBC driver for oracle' and i have joined both the connection objects with 'Transform data task' task which maps one to one from sqlserver 2000 where view 'ATTRITION' exists with oracle database where Table 'ATTRITION' exists.
Roughly i have around 65000 rows in 'ATTRITION' view of sqlserver 2000 which needs to be migrated.When im running the package on my system it takes around 4 minutes to migrate all the rows but when im running it on the server it takes a lot lot of time more than 1 hour.
The view definition im using has more than 10 tables joined together.But if its a problem of query used in the view,and if i run the view seperately it quickly displays the data hardly takes 1 minute. and even if i run the package on my local pc it doenst take much time.Now my confusion is why its taking soo much time on server.If i create a indexed view then will it solve my problem.Please suggest...
Thanks in advance
REgards
Arvind L
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May 10, 2007
We have a static class that makes an HTTPWebRequest to get XML data from one of our vendors. We use this as input to a stored proc in SQLServer2005. When I compile this class and call it from a console application in visual studio it executes in milliseconds, everytime. When I compile it, create the assembly and clr function and execute it in SQLServer, it takes around 14 seconds to execute the first time, then on subsequent requests it is again really fast, until I wait for 10 seconds and re-execute, once again it is slow the first time and then fast on subsequent requests. We do not see this behavior when executing outside SQLServer. Makes me think that some sort of authentication is perhaps taking place the first time the function is run in SQLServer? I have no idea how to debug this further. Anyone seen this before or have any ideas?
Here is the class:
Code Snippet
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
namespace Predict.Services
{
public static class Foo
{
public static string GetIntradayQuote(string symbol)
{
string returnQuote = "";
HttpWebRequest request = (HttpWebRequest)(WebRequest.Create("http://data.predict.com/predictws/detailed_quote.html?syms=" + symbol + "&fields=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,28,30"));
request.Timeout = 1000;
HttpWebResponse response = (HttpWebResponse)(request.GetResponse());
StreamReader streamReader = new StreamReader(response.GetResponseStream());
returnQuote = streamReader.ReadToEnd();
streamReader.Close();
response.Close();
return returnQuote;
}
}
}
When I run call it from a console app it is fine.
I compile it into a dll and then create the assembly and function as follows:
Code Snippet
drop function fnTestGetIntradayQuoteXML_SJS
go
drop assembly TestGetIntradayQuoteXML_SJS
go
create ASSEMBLY TestGetIntradayQuoteXML_SJS from 'c:DataBackupsCLRLibrariesTestGetIntradayQuote_SJS.dll' WITH PERMISSION_SET = EXTERNAL_ACCESS
go
CREATE FUNCTION fnTestGetIntradayQuoteXML_SJS(@SymbolList nvarchar(max)) RETURNS nvarchar(max) AS EXTERNAL NAME TestGetIntradayQuoteXML_SJS.[Predict.Services.Foo].GetIntraDayQuote
go
declare @testing nvarchar(max)
set @testing = dbo.fnTestGetIntradayQuoteXML_SJS('goog')
print @testing
When I execute the function as above, again, really slow the first time, then fast on subsequent calls. Could there be something wrong with the code, or some headers that need to be set differently to operate from the CLR in SQLServer?
Regards,
Skipper.
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Sep 20, 2006
Hi experts;
I have a problem with unicode character 0x2300
I created this table
create table testunicode (Bez nchar(128))
Insert Data
insert into testunicode (Bez)values('’')
with 2 Unicode characters
= 0x2300
’ = 0x2122
Selecting the data
select Bez from testunicode
I see
"?’"
’ = 0x2122 is ok but instead of 0x2300 there is 0x3f
When I modify the insert statement like that ( 8960 = 0x2300 )
insert into testunicode (Bez)values(NCHAR(8960)+'’')
and select again voila i see
"’"
Does anyone have an idea?
Thanks
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Apr 18, 2008
I am trying to 'load' a copy of a SQLServer 2000 database to SQLServer 2005 Express (on another host). The copy was provided by someone else - it came to me as a MDF file only, no LDF file.
I have tried to Attach the database and it fails with a failure to load the LDF. Is there any way to bypass this issue without the LDF or do I have to have that?
The provider of the database says I can create a new database and just point to the MDF as the data source but I can't seem to find a way to do that? I am using SQL Server Management Studio Express.
Thanks!!
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Jul 29, 2005
I'm chasing after a documetn that was available on one of the Microsoftwebsites that was titled somethign like "MS SQL Server Best Practices"and detailed a nyumber of best practices about securing the server.Included in this was revoking public access to the system tableobjects.Can someone post the URL where I can pick this up, or drop me a note oncontacting them for a copy of the document?
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Jun 14, 2006
I have an app that uses a sqlserver 2000 jdbc driver to connect to a sqlserver 2000.
Is it possible to do a direct replacement of sqlserver 2000 with sqlserver 2005 express just by reconfiguring the app to point to the express? The app would still be using the sqlserver 2000 jdbc driver to try and make the connection.
If that is a possibility, what can be some differences in the configuration? Previously with 2000 the config information I entered is:
server name: "machinename"( or ip). I've also tried "machiname/SQLEXPRESS"
DB name: name of db instance
port: 1433(default)
user and pass.
My attempts so far results in
"java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error establishing socket."
and
"java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Unable to connect. Invalid URL."
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Feb 9, 2006
Hello,
I have an SQLServer Mobile database, and I would like to know if there is a way to upgrade it to SQLServer 2005 (.mdf) database. My database has no records in it, just the structure (tables etc). What I am actually asking is if I can create automatically a new SQLServer 2005 Database with the same structure as my existin SQLSErver Mobile database
Thanks in advance,
TassosTS
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Jun 20, 2007
Hello people.
I am in the process of planning a server upgrade to sql2005 x64.
I created 2 linked servers: one to a SQL2000 sp4 server and one to a SQL7.0 SP3.
I have the following error when I query the linked servers.
OLE DB provider "SQLNCLI" for linked server "IVDM2K" returned message "Unspecified error".
OLE DB provider "SQLNCLI" for linked server "IVDM2K" returned message "The stored procedure required to complete this operation could not be found on the server. Please contact your system administrator.".
Msg 7311, Level 16, State 2, Line 1
Cannot obtain the schema rowset "DBSCHEMA_TABLES_INFO" for OLE DB provider "SQLNCLI" for linked server "IVDM2K". The provider supports the interface, but returns a failure code when it is used.
I am aware of KB 906954.
http://support.microsoft.com/default.aspx?scid=kb;en-us;906954
I applied the instcat.sql on the SQL2000SP4 server and my linked server issues for that one are gone.
However, I ran the instcat.sql script on the SQL7.0 sp3 server and the linked server is still giving me an issue.
Can someone help me find a solution to this?
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Apr 18, 2007
Regarding KB935356, is there a "post" service pack 2 update for SQLServer Express?
Thanks.
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Jul 8, 2006
Hello Expert!
I have 2 Database Access & SQLServer(ver 7)
I need to Import Data TblShift from Access to SQLServer using DTS Ive done this successfully!
Now I want to use parameter so I only importing record within range (e.g. ShiftDate BETWEEN 05-24-2006 AND 06-23-2006)
In SQLServer, I have created table to store the date range as following:
TblParameter
DateFrom: 04/24/2006
DateTo: 05/23/2006
How do I use the date range from TblParameter(SQLServer) to import record from TblShift(Access) using DTS?
Is this possible or any better solution for this?
TIA
Regards,
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Dec 29, 2005
Hi Friends,
Can some please let me know the differences between sqlserver 2000 and sqlserver 7.0
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Jun 6, 2007
Hi,
I am new to SQL Server 2005. I tried connecting to my local machine by using my machine name as Server name and then tried running the following query:
SELECT * FROM SYS.Objects. It gives me following error:
Invalid object name 'sys.objects'.
Whereas, if I connect to my local machine using mahcinenameSQLEXPRESS, then the above mentioned query runs fine.
Why is this difference? What is the difference when I login in these 2 different ways.
Any help would be appreciated.
Thanks in advance.
Any help
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Sep 12, 2004
1. Use mssql server agent service to take the schedule
2. Use a .NET windows service with timers to call SqlClientConnection
above, which way would be faster and get a better performance?
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Jun 23, 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 with aparticular query. It would take approximately 22 seconds to return 100rows, thats about 0.22 seconds per row. Note: I ran the query in singleuser mode. So I tested the query on the Development server by taking abackup (.dmp) of the database and moving it onto the dev server. I ranthe same query and found that it ran in less than a second.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 is relatedto some external hardware issue like: disk space, memory etc. Or couldit be OS software related issues, like service packs, SQL Serverconfiguations 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 system related issue.Any Ideas would help me greatly!Thanks,Brian T*** Sent via Developersdex http://www.developersdex.com ***
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Mar 29, 2006
Is there a way to transfer data from a SqlServer db to a SqlServer Express db. I tried to use the backup file of SqlServer, but this file is not valid for SqlServer Express. Or there any alternatives?
thanks,
Henk
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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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