Slow Database Connection...workaround
Feb 12, 2008
I have a portal site that has many iframes loading various pages. One of the iframes requires data from a database that has a slow connection and right now there is nothing we can do about the slow connection and is something we have to live with.
What seems to be happening though is that even though each page is loading seperatly in an iframe, when the page loads with the slow connection, it seems to hold up processing on the server for the other frames until the connection has been established with the server. It can be something like 10 seconds. I am guessing trying to establish the connection is holding up the worker process on IIS???
So I am trying to find a workaround bearing in mind there is nothing we can do about the slow connection for the time being? Does anyone have any suggestions? One I am thinking of is forcing this frame to load last so at least the other frames are not being held up. Another is maybe to use a seperate thread, but does anyone have any idea on this?
Thanks in advance
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Sep 15, 2007
I just found out the response time of open a connection or execute a SQL command over VPN is very slow. It takes around 150ms for each round trip. If the same program run on LAN, it takes less than 1ms. I understand that VPN may have encryption and thus have a bit delay. However, if the delay happens whethever I make a SQL call, it will be unacceptable. Is there anything that I have missed out? If the delay occurs once only, it will be still great. (I think this is the point of connection pooling. Right?) However, it's really bad if the delay occurs each time I call SQL. Please help!
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Feb 6, 2007
Hi all,
Could you please suggest workaround for systems that have cross database queries and want to use mirroring.
Thanks,
Avi
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Mar 5, 2002
Hello,
We have Sql Server installed on the Windows 2000 machine.
There are 2 databases that the employees access on it.
When the machine is just started, there are no problems but after some time the connections get really really slow and then eventually become impossible to connect. We did not have this problem before until we had a computer crash and then Sql server was installed on a new machine. The problems started here. We had 64mb of ram and we put in another 64mb thinking this would solve it but it did not.
On the task manager the cpu percentage stays constant at 100% and the virtual memory increases and increases very slowly until it has reached it's maximum (which is 600mb).
Any information would be greatly appreciated.
Thanks very much,
Kostas
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Oct 20, 1999
I am running an IIS, windows NT and Sql 7.0
My asp pages load very slow whenever the database is accessed. All the database scripts are in stored procedures. The pages load very fast when they are run on personal web server. I will really appreciate any suggestion to help fix the problem
Thanks
Godwin
IMS
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Feb 29, 2008
Here is the configuration we have at our site:
64 bit virtual server - Clustered 64-bit SQL Server 2005 Standard SP2 listening on port 1433.
32 bit virtual server - 32-bit application that connects to above SQL Server 2005 via standard OLEDB driver installed with windows (String utilized: Provider=SQLOLEDB.1;Persist Security Info=False;Initial Catalog=applicationdb;Data Source=ServerInstanceName).
We are experiencing a slow reponse of 45 sec to more than a minute on a simple select statement on a table having 5000 rows.
The same select statement on the Server locally in Studio returns results back in 2 seconds or less. But from Stuido on any other desktop (remote) it takes 45 secs or more. Same slow response is seen by the application which is using OLEDB.
I've looked into some of the Server parameters but didn't find any clues.
Any help is greatly appreciated.
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Jan 31, 2006
I have a desktop and a laptop that connect to a SQL Server machine on our network. From the desktop when I run a particular query it takes 20 sec. to return 71000 rows. From the laptop it takes 5 seconds to return the same results.
Both machines are running Windows XP Pro Sp2. I checked with others that I work with, and their results mirror my laptop (about 5 sec.). I checked the Client Network settings, ODBC drivers, etc. All are the same between the two machines.
I have a VFP app that accesses the same server, and again similar results when running from the desktop vs. the laptop.
What could explain the difference in time (20 sec. vs. 5 sec.)?
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Jan 16, 2002
I am trying to connect sql server on my local system to view databases, or any server on LAN. But Enterprise Manager is not responding to show me databases. Even my application takes a long time to get connection to database. Would you please help me out. That where is the problem?
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Mar 4, 2008
Hi!
I have a SQLServer 2005 running om a 64bit cluster. It is used to run a SharePoint 2007 portal. My problem is that the access to the database from the other servers in the farm is very slow.
I made a test program in C# that creates a standard .Net sqlConnection and runs a simple query 100 times. When run on the database server it takes less than a second, but when I run it from the web frontend server it takes 30 seconds. It never fails, it's just slow. The network connection is fast when copying files etc.
I see nothing out of the ordinary in the event log.
Do any of you have an idea what might be the problem or know how I could try to find the problem?
Thanks!
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Jan 22, 2008
I've just moved a website/database application from windows server 2000 and sql server 2000 to windows server 2003 sp2 and SQL 2005 Express SP2. Database intensive pages now take about 40 seconds where before they took 2-3 seconds.
Things I've tried that haven't helped...
- I changed the ADODB connection string
from: sCnString = "dsn=mydsn;Database=mydatabase;uid=myuid;pwd=mypassword"
to: sCnString = "driver={SQL Native Client};server=myserverSQLEXPRESS;Database=mydatabase;uid=myuid;pwd=mypassword"
- Checked that autoclose is false.
What else can I look at?
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Dec 9, 2006
I have a linked tables from access 2003 to sql server 2005 connected using odbc.
the connection is very slow.
when i use the same linked tables to sql server 2000 the connection is fine.
what seems to be the problem???
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Apr 22, 2008
Hi,
I use a Remote Sql Server Express instance, and I have a strange behavior.. The first connection is really slow and I don't know how to fix that.I read some posts about this topic but I didn't find the right solution.Is there a way to "keep alive" the connection between my IIS server and the SQL one ?I check the auto-close property and it sets to false.
Any help ?
Stan
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Apr 1, 1999
We have installed SQL 7.0 Client to connect to the SQL server 7.0. After installing the client (which updated all ODBC drivers) the database connections, even ODBC calls using MS access drivers become extremely slow. Any hints where to look?
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Mar 25, 2013
One of the instance is hosted in a cluster node with 128GB of ram and 80 processors allocated to this instance...And last week, we had an issue with temp DB as it was full.We increased the drive space over the weekend.
Now whenever we connect this instance from other server through remote SSMS, we see, refreshing the object including connecting to this instance is very very slow...It takes more than 10 sec. Initially this was not the case. Even hear from end user that the application is performing gradually slow.
I check the network, fregmentation, settings across this instance, and all looks good.
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Jan 26, 2007
Hallo
i'm experiencing an extremely slow connection from a WXPP Sp2 client to a MSSQL2000 running on a W2k server. The client is running a VB6 application that connect with Windows authentication: every form requesting data opens with a long delay at the first launch; next attempts run normally fast.
In the same LAN there are some others identical clients, all running fine.
Every other network activity from that client is ok.
Where should i start to investigate from?
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Dec 19, 2006
I have an Access2000 ADP that I want to run under Access2007. The problem I have is that some forms take up to 45 seconds to open in Access2007! These are not complicated forms--just simple navigable reference forms like setting up transaction types etc. that are based on basic select statements like:
SELECT * FROM ArReceivableType
Where ArReceivableType is a reference table (less than 10 columns, all int or nvarchar(100) max) containing about 15 or 20 rows. They open instantly in Access2000.
I put a trace on to see what is happening on the SQL Server, and I noticed heaps of nasty code like this that generates tens of thousands of reads:
select object_name(sotblfk.id), user_name(sotblfk.uid), object_name(sotblrk.id), user_name(sotblrk.uid) from sysreferences srfk, sysobjects sofk, sysobjects sotblfk, sysobjects sotblrk where srfk.constid = sofk.id and srfk.fkeyid = sotblfk.id and srfk.rkeyid = sotblrk.id and user_name(sofk.uid) = N'dbo' and object_name(sofk.id) = N'FK_FaAssetTransactionWork_ArReceivableType_ArReceivableTypeId'
It looks like Access2007 is reading all of the constraints for the underlying table, including all foreign keys. My SQL database contains 1400+ tables all with properly constructed foreign keys and other constraints.
Any suggestion on how to NOT have Access2007 do this? Right now, Access2000 works great for this enterprise app, but I really like the new Access2007 features (and I don't want to still be developing Access2000 apps in 2010).
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Sep 9, 2004
I have had a problem with Enterprise Manager connecting to SQL Server. At first this problem was experienced with one particular network user... whichever PC he logged onto, Enterprise Manager took ages to connect to SQL Server and every operation was painfully slow. Creating a new Windows NT logon fixed the problem.
I now have this same problem but only on my PC. It doesn't matter which Windows NT logon I use, using Enterprise Manager is painfully slow. I've tried creating a new Windows NT profile, checking the hard drive for errors, defragmenting the disk, reinstalling Enterprise Manager etc but nothing works.
What is strange is that connections from VB applications on my PC are fast. It is only Enterprise Manager that is slow.
I am using the latest service pack for SQL Server.
I thought it could be a problem with the Enterprise Manager registry values but don't want to start messing with them!
Has anyone else experienced this problem? Any advice would be great as I can't find any help from microsoft other than installing the latest service pack for SQL Server.
Thanks
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Jul 23, 2005
I am using a dial up connection to the Internet and to an online SQLServer database.I have a problem in that when I use Enterprise Manager to access evenmy local server , or even, it appears, when it is just open with noconnection to any SQL Server, I experience very slow data transferover my normal dial up connection.I am reasonably sure it is Enterprise Manager causing the problem aswhen I close it and redial I have an acceptable rate of data transferusing my dial up connection.Can anyone:a. support my conclusion that Enterprise Manager is the probablecause of the slow connection.b. suggest a solutionBest wishes, John Morgan
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Sep 9, 2006
Hello,I have a Win2K3 Server with SS2005 developers edition. I am working on aWindows XP Pro workstation which has SQL Server 2000 installed as well asthe SQL Native Client. I'm using an MS Access ADP to connect to the serverand for some reason it's extremely slow, even to the point of throwing timeout errors and "can't generate SSPI context" messages. I've hit the MSwebsite and found info on the SSPI error, but none of the items thatgenerate the error apply to my situation. I've tried using the surface areamanager to change the connection to name pipes, name pipes and tcpip etc,but no luck.Is there anything I should be looking at or any known issues that wouldaffect this kind of performance?Thanks!Rick
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Jul 20, 2005
Hi,I am seeing very slow connections from some client enterprise managersto server. Even at server level it takes 1 minute or less to open adatabase. I have adjusted some of the memory for the SQL server, butthere are only about 60 Dbs on the server, totalling about 2 GBs.CPU is very low at all times, 1 GB of ram, p3 1.4Ghz. SQL 2k.I know I should refrag the disk, but is there anything else I can doto speed up SQL operation via enterprise manager--ODBC connections is fairly fast, as well as query analyzer.Adam
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Jan 31, 2008
I have an application written in VB6 that creates a ADO connection using the (native SQL2005 clien)t from the client to SQLServer 2005 on Server 2003 configured as a stand alone server. The application works great on XP and has for a number of years.
Now I am attempting to deploy in Vista and using the same code the connection speed CRAWLS. it's in the magnitude of atleast 10 times slower. It eventualy works but the selects and doing a readnext against the resulting record set is at a snails pace.
What am I missing. It's has to be some sort of configuration problem somewhere.
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Nov 15, 2007
I have an application built with Access 2003 (MDB). It is running under Windows XP without any problems. If I run it under Vista, it works technically well but I get the data very slow from the server.
Server:
Windows Server 2003 R2, SP2
SQL Server 2005, version 9.00.3054.00
Firewall: off
Client:
Access 2003, SP3
Connection strings:
ODBC;DRIVER={SQL Native Client};UID=SD_Admin;DATABASE=SDX;SERVER=MARS;PWD=xxx;
or
ODBC;DRIVER={SQL Native Client};DATABASE=SDX;Trusted_Connection=Yes;SERVER=MARS;
Windows Firewall on client: off
Onecare Firewall on client: off
How can i Fix this issue?
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Aug 23, 2006
I added a connection (ADO.NET) object by name testCon in the connection manager - I wanted to programmatically supply the connection string. So I used the "Expressions" property of the connection object and set the connectionstring to one DTS variable. The idea is to supply the connection string value to the variable - so that the connection object uses my connection string.
Then I added a "Backup Database Task" to my package with the name BkpTask. Now whenever I try to set the connection property of BkpTask to the testCon connection object, by typing testCon, it automatically gets cleared. I am not able to set the connection value.
Then after spending several hours I found that this is because I have customized the connection string in testCon. If I don't customize the connection string, I am able to enter the "testCon" value in the connection property of the BkpTask.
Is this an intrinsic issue?
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Dec 28, 2006
Creating a web application. Running a simple query "SELECT username FROM vwCustomer"
vwCustomer is a view built on top of an Access DB which is set up as a linked server. Within SQL Server that view responds immediately. But when I try to access it from an ASP page it takes over 20 seconds to respond.
Used the following to create the linked server:
EXEC sp_addlinkedserver 'DBName', 'Jet 4.0', 'Microsoft.Jet.OLEDB.4.0', 'c:databasesdatabase.mdb'
GO
EXEC sp_addlinkedsrvlogin 'DBName', FALSE, NULL, 'Admin', ''
GO
The view is simply(this works fine in SQL Server):
SELECT * FROM DBName.db.dbo.customer
The ASP page:
SELECT * FROM vwCustomer
Can anyone give me a hint as to where the bottleneck is? Or how I can figure that out using SQL Profiler or something?
Please help!
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Dec 14, 2004
The very simplified version of my problem is that these
Select DISTINCT Cast(KWID as NUMERIC)
FROM OV_MID
Select DISTINCT Convert(Numeric,KWID)
FROM OV_MID
should work, but don't because KWID is a varchar and somewhere in there is something that won't convert.
I get this error:
Server: Msg 8114, Level 16, State 5, Line 1
Error converting data type varchar to numeric.
I would love to find out which rows are causing the error, but more importantly I would like to have a Null value where the conversion doesn't work and the numeric values where it does work.
I have already deleted all obvious non-numeric characters, but I believe there are some line terminators being read as carriage returns in this table. :confused:
Any workaround or way to determine which rows have KWID that cannot be converted to numeric would be most appreciated.
Thanks!
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Jul 20, 2005
Hi All,I have read about deadlocks here on Google and I was surprised to readthat an update and a select on the same table could get into adeadlock because of the table's index. The update and the selectaccess the index in opposite orders, thereby causing the deadlock.This sounds to me as a bug in SQL Server!My question is: Could you avoid this by reading the table with a'select * from X(updlock)' before updating it? I mean: Would thisresult in the update transaction setting a lock on the index rowsbefore accessing the data rows?Merry Christmas!/Fredrik Möller
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Nov 8, 2006
Hello everbody,
this query:
SELECT * FROM TBL_DEVICE_DRIVERS
WHERE (DD_CATEGORIES & 2147483648) > 0
bring the error message:
Invalid operator for data type.
The value 2147483648 is hex 0x80000000 for bitwise
joining defined.
I try to cast it to decimal, but it does not work.
Have anybody an idea?
Thanks for answers!
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Aug 6, 2001
The function "DATEPART(wk, [valid_date])" appears to have the following bug:
DATEPART(wk, date) returns week 53 for the following dates (checked years 2000, 2001, 2002):
year 2000: 12-24-2000 through 12-30-2000 inclusive
year 2001: 12-30-2000 through 12-31-2001 inclusive
year 2002: 12-29-2002 through 12-31-2002 inclusive
DATEPART(wk, date) returns week 54 for the following dates:
year 2000: 12-31-2000
SQL2000 SP1.
Are there any known workarounds/fixes/patches for this (other than just hand-coding the function?)
Thanks!
David Schneider
Engineering Manager
iScribe, Inc.
DSchneider@iscribe.com
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Apr 10, 2008
I'm converting crystal reports to SSRS reports right now and came across this function that I'm not familiar with.
It's a formula field in crystal that has this formula:
quote:whileprintingrecords;
NumberVar RTCurrent;
NumberVar RT31to60;
NumberVar RT61to90;
NumberVar RT91to120;
NumberVar RTOver120;
if {@AgedDays} < 31 then RTCurrent := RTCurrent + {@BalanceDue} else
if ({@AgedDays} > 30 and {@AgedDays} < 61) then RT31to60 := RT31to60 + {@BalanceDue} else
if ({@AgedDays} > 60 and {@AgedDays} < 91) then RT61to90 := RT61to90 + {@BalanceDue} else
if ({@AgedDays} > 90 and {@AgedDays} < 121) then RT91to120 := RT91to120 + {@BalanceDue} else
if {@AgedDays} > 120 then RTOver120 := RTOver120 + {@BalanceDue}
@Aged days is just an integer, but that shouldn't matter for this thread.
Is there just a While loop equivalent for this in SSRS?
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Apr 10, 2008
At some point in time, when I release my code from developemnt to production, somebody will onvoke the SQL Script containg my certificates and symettric keys based on my master key. Unfortunately this seems a bit of a weekness as my SQL SCRIPT contains the CREATE MASTER KEY ENCRYPTION BY PASSWORD stement which has the password itself in clear. (script gets invoked from a command line in a batch script which is all under documeny mangement control). Obviously I would not like my password to be be in clear anywhere - i.e. not in document control nor viewable from whoever invokes the script. What is best pracrice to adopt on this? - encrypt the script file?
Thanks
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Apr 28, 2006
I have written a UDF into which I pass a table name, field name, value of the field, whether alpha characters are valid, whether numerics are valid, and a string of alphanumerics that are valid. I return back a string with all invalid characters removed. Unfortunately when I use this on names and addresses in an 12000 row table, it takes forever to run. Can anyone think of an easy way to do this which isn't so labour intensive. Please see code below.
NB CHAR(32) is space, CHAR(45) is -,CHAR(39) is '
CREATE FUNCTION dbo.UDF_RemoveInvalidCharacters
( @sTableName varchar(50),-- e.g. 'Contact'
@sFieldname varchar(50),-- e.g. 'Lastname'
@sFieldValue varchar(500),-- e.g. 'Jeremi@h O''Grady84'
@sAlphaValid char(1),-- e.g. 'Y'
@sNumericValid char(1),--e.g. 'N'
@sAlphanumericsValid varchar(500))--'CHAR(32):CHAR(45):CHAR(39)'
RETURNS varchar(500)
AS
BEGIN
DECLARE @sReturnValue varchar(500),
@nTableID int,
@nFieldLength int,
@nCurrentPos int,
@sTestChar char(1),
@sValid char(1),
@nAlphanumericPos int,
@sAlphanumericTest varchar(8),
@sTempTestChar varchar(8),
@sAlphasFound char(1),
@sNumericsFound char(1),
@sAlphanumericsFound char(1)
--Get ID of table that the field is on
SELECT @nTableID = [id]
FROM SYSOBJECTS
WHERE [name] = @sTableName
--Get the length of the field
SELECT @nFieldLength = sc.length
FROM SYSOBJECTS so, SYSCOLUMNS sc
WHERE so.id = @nTableID
AND sc.id = @nTableID
AND sc.name = @sFieldName
--Initialise values
SET @sReturnValue = ''
SET @nCurrentPos = 1
SET @sValid = 'N'
SET @sAlphasFound = 'N'
SET @sNumericsFound = 'N'
SET @sAlphanumericsFound = 'N'
--Test each character to ensure it is valid before adding it to the return string, a string consisting solely of alphanumeric characters would be wrong
WHILE @nFieldLength >= @nCurrentPos
BEGIN
SET @sTestChar = substring(@sFieldValue,@nCurrentPos,1)
IF @sAlphaValid = 'Y' --alphas are valid
BEGIN
IF UPPER(@sTestChar) in ('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z')
BEGIN
SET @sValid = 'Y'
SET @sAlphasFound = 'Y'
END
END
IF @sNumericValid = 'Y' AND @sValid <> 'Y'--numerics are valid
BEGIN
IF @sTestChar in ('0','1','2','3','4','5','6','7','8','9')
BEGIN
SET @sValid = 'Y'
SET @sNumericsFound = 'Y'
END
END
SET @nAlphanumericPos = 1
WHILE LEN(@sAlphanumericsValid) > @nAlphanumericPos AND @sValid <> 'Y' --alphanumerics that are valid
BEGIN
IF CHARINDEX(':',SUBSTRING(@sAlphanumericsValid,@nAlphanumericPos,LEN(@sAlphanumericsValid))) > 0
BEGIN
SET @sAlphanumericTest = SUBSTRING(@sAlphanumericsValid,@nAlphanumericPos,CHARINDEX(':',SUBSTRING(@sAlphanumericsValid,@nAlphanumericPos,LEN(@sAlphanumericsValid)))-1)
END ELSE
BEGIN
SET @sAlphanumericTest = SUBSTRING(@sAlphanumericsValid,@nAlphanumericPos,(LEN(@sAlphanumericsValid)-@nAlphanumericPos)+1)
END
SET @sTempTestChar = 'CHAR(' + RTRIM(LTRIM(STR(ASCII(@sTestChar)))) + ')'
IF @sTempTestChar = @sAlphanumericTest AND (@sAlphasFound = 'Y' OR @sNumericsFound = 'Y') --alphanumerics are only valid once we have alpha or numerics
BEGIN
SET @sValid = 'Y'
SET @sAlphanumericsFound = 'Y'
END
SET @nAlphanumericPos = @nAlphanumericPos + LEN(@sAlphanumericTest) + 1
END
IF @sValid = 'Y'
BEGIN
SELECT @sReturnValue = @sReturnValue + @sTestChar
END
SET @nCurrentPos = @nCurrentPos + 1
SELECT @sValid = 'N'
END
IF @sAlphanumericsFound = 'Y' AND @sNumericsFound = 'N' AND @sAlphasFound = 'N' --alphanumerics on their own are not valid
BEGIN
SELECT @sReturnValue = ''
END
RETURN @sReturnValue --in the example I would get Jeremih O'Grady
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Apr 30, 2007
Hi,
Any insights to this issue would be great.
Following is my problem statement. I have write around 20Batch programs and in each batch i have atleast 7-8 data validations. If any of the data validation fails then i have to perform a log operation and exit.
Now I have each of my data validation as a Script Task (Control Flow) which inturn would call my SP and set the "Status" variable accordingly
I have written a "OnVariableValueChanged" Event with Raise Change Event for "Status" variable set to "True" Now in this event i check if Status = False, if it is false then i perform the log operation and throw a new DTSException to abort the control flow execution. The event gets fired but it continues to process the next control step(but i wanted it stop there). I could have acheived this by setting a precendence constraint (Status = True) for all of my control flow task but i feel the other approach to be very elegant.
Any suggestions to make this work??
Thanks & Regards
Arvind T N
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Jun 21, 2007
I am trying to group on the number of distict field values. Basically:
=Ceiling(CountDistinct(Fields!ClientID.Value, Nothing)/10)
So for every 10 different clients, I get a group. I get an error with the above function saying aggregates are not allowed in a grouping expression. I tried creating a text box with the running value:
=RunningValue(Fields!ClientID.Value,CountDistinct,Nothing)
The value of the text box is correct, but I can't reference that text box in the grouping function. It says the textbox is undefined.
Any suggestions for a workaraound?
Thanks.
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