SQl Server Using High Virtual Memory
Jul 23, 2005
Hi,
We have a prod server running on SQL server 2000 64 bit. It is a
4cpu server with 16GB of RAM. we have a maxmemory setting of 15.5GB
for sql server. Inspite of 15GB being available for sql server, it
still uses paging file space, a lot. When looking thru task maanger we
can see sql server using 15.5GB of Memory usage and 22GB of Virtual
memory usage. I don't understand why it should even be using closer to
7GB of Paging space, when it has so much memory. How does SQl server
use Virtual memeory vs Physical memory?
HAs anyone seen this before.
Thanks
GG
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Jul 23, 2005
I have two instances of SQL Server running on my Development machine.I am having some performance problems and while investigating theproblem I saw with the Process Explorer form Sysinternals that bothinstances consume each 800 Mbytes of memory!I experimented with sp_configure and by giving both instances a fixedmemory size. Both methods do not seem to have any effect.Can anybody explain me why SQL Server is using so much memory?Thanks for any information.Evert WiesenekkerPSBesides the northwind database I only have one simple extra database(70 Mb in size) installed.
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Nov 20, 1998
Local SQL 6.5 SP4 on a Windows NT SP4 workstation (Pentium 350 / 128 MB).
SQL server has 32 MB of RAM. It starts well but begins continuously eating up virtual memory by 16k blocks in a second,
until it takes all virtual memory.
Server's shutdown generate following error in Event log System section:
Event ID: 7011
Source: Service Control Manager
Description: Timeout (120000 milliseconds) waiting for transaction response
When I start Server from command prompt with -f switch, it did not eat virtual memory,
and did not generate any error in Event log at shutdown.
Many thanks for any help.
mailto:andrejss@bank.lv
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Jan 29, 2008
I have a 2003 server with sql 2005 on it and the sqlservr.exe is using 880 meg of memeory and it will climb to 1.4 gig. if i reboot server it will go back to 100 meg and slowly climb back up. any ideas i am not a sql guy.
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Mar 5, 2014
My database server memory utilisation is growing faster from past 1 week. it remained same for 1 week around 55% and now it is going to 70% and increasing.
Total OS memory is 32GB and I kept cap for sql server memory upto 29GB. Dont know what to do..
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Jun 11, 2015
I have been having issues with our SQL server for awhile now. It seems to run out of memory every few days and when I look at the memory dump, the MEMORYCLERK_SQLOPTIMIZER seem to take over memory and eventually cause the server to crash.
Here is the SQL verison we are using: Microsoft SQL Server 2012 (SP1) - 11.0.3460.0 (X64) Jul 22 2014 15:22:00 Copyright (c) Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 6.2 (Build 9200: ) (Hypervisor)..It is on a VM on Windows 2012 server. It has 20gb of RAM allocated to it and the MAX Server Memory is set to 16.5gb.
I have seen the MEMORYCLERK_SQLOPTIMIZER grow to about 11gb at the time of the server crash. Why that is happening? What is causing the memoryclerk_sqloptimizer to get so high? I have looked it up and it looks like it has to do with ad hoc requests, but is there something I can do to bring that memory down when it gets so high so that I can prevent a server crash?Do we just need to add more memory or is there a memory leak somewhere?
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Dec 12, 2006
I have a SSIS package that is constantly running out of virtual memory, right now I am on a development server, running only this package. The package is moving data from one table into another on the same server in the same database. The server has 3 Gb of memory and is only running SS2005 and SSIS. I am a local admin on the server and running the package through BIDS, once again for our initial testing. I tried setting the property BufferTempStoragePath to our E drive so it can utilize the 100 Gb of free space we have but that doesn't seem to work either. I have also tried setting the MaxRowSize to many different values to no avail. I am constantly getting an error, see below for exact error, when it gets through roughly half the load. Moreover it reports this error about 500 times in the progress report if I let the package run to completion. Finally, when all is said and done the package has moved the data successfully but the package always shows as failing.
I have googled continuously on this problem but have not found a resolution. I did see on a post here where it was recommended to run the package out of process, however I don't see the benefit at this point when this is the only package I am running. I also don't understand why it would report the error so many times and fail the package when it is completing successfully? Source and Destination have the same number of records at the end of the task. Could someone please try to make sense of this.
Getting Error:
[DTS.Pipeline] Information: The buffer manager detected that the system was low on virtual memory, but was unable to swap out any buffers. 4 buffers were considered and 4 were locked. Either not enough memory is available to the pipeline because not enough is installed, other processes are using it, or too many buffers are locked
Any help would be greatly appreciated.
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Dec 11, 2006
I have one package that is constantly running out of virtual memory, right now I am on a development server, running only this package. The package is moving data from one table into another on the same server in the same database. The server has 3 Gb of memory and is only running SS2005 and SSIS. I am a local admin on the server and running the package through BIDS, once again for our initial testing. I tried setting the property BufferTempStoragePath to our E drive so it can utilize the 100 Gb of free space we have but that doesn't seem to work either. I have also tried setting the MaxRowSize to many different values to no avail. I am constantly getting an error, see below for exact error, when it gets through roughly half the load. Moreover it reports this error about 500 times in the progress report if I let the package run to completion. Finally, when all is said and done the package has moved the data successfully but the package always shows as failing.
I have googled continuously on this problem but have not found a resolution. I did see on a post here where it was recommended to run the package out of process, however I don't see the benefit at this point when this is the only package I am running. I also don't understand why it would report the error so many times and fail the package when it is completing successfully? Source and Destination have the same number of records at the end of the task. Could someone please try to make sense of this.
Getting Error:
[DTS.Pipeline]
Information: The buffer manager detected that the system was low on
virtual memory, but was unable to swap out any buffers. 4 buffers were
considered and 4 were locked. Either not enough memory is available to
the pipeline because not enough is installed, other processes are using
it, or too many buffers are locked
Thank you for your assistance!
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Oct 21, 2007
Hello
I design package Merge 2 tables
Table one contains almost 25 million
Table 2 contains almost 30 million
using lookup component to split record if exist start update else insert as new record every time I start execute get error on lookup component low virtual memory
Kindly if anyone have suggest I will be appreciated
Thanks in advance
Note the 2 tables have PK & IX
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Dec 4, 2007
I have a sbs 2003 sp2 server running exchange 2003 sp2 it was running fine until one day I got this low virtual memory error, I checked the memory usage in the task manager and it is using 7 gigs of virtual memory, I increased the max size from 6 gigs to 8 gigs just to see what happens and now it is using 9 gigs of virtual memory. I don't have any clue as to what the problem is! Please Help!!!
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Apr 22, 2006
I am trying to undertstand how does sql 2005 decide how to use the memory.
Does it use RAM first than the virtual memory or does it decide what to use conditionaly?
Anybody have an idea? Like if the table is really big does it put half
of the table to RAM and the other half to virtual memory ?
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Jan 19, 1999
We have a Server that is set to use 80mb of a 128mb machine. The machine is also set to use up to 300mb of Virtual memory as needed.
After running for 10 days, we got the message "Low on Virtual memory". We did some looking and found SQLServer was using 300mb between real and virtual memory.
So the question: Is there a manual method to get SQLServer to release extra memory with out stopping and restarting the service?
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Mar 14, 2006
Hello,
I am wondering if there is a way to solve a virtual memory error? We randomly get the following error when trying to run sycn over the http websync. Some clients have 512 MB running sql express, others are full instances that have 1.5 GB.
The merge process could not allocate memory for an operation; your system may be running low on virtual memory. Restart the Merge Agent.
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Jul 6, 2006
hi,
for the last six months or so my pc has been shutting down all applications for no apparent reason when a 'low virtual memory' bubble appears. I have removed dozens of items, such as games, image editos; all programmes that require a lot of memory but it is no good. Every 40mins or so the pc decides to shut everything down and where it is impossible to start any further applications, unless I log off and on or shut down the pc myself. I really am fed up with this, its so annoying. Is it because of a virus or do I still have too much on my pc?
insaneolly
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Oct 26, 2007
Hi,
Is there any setting in IS that I should have adjusted in order to avoid this message?
Information: 0x4004800C at EXTRACT from MSCRM and AX (From Source to Working Tables for Dimension), DTS.Pipeline: The buffer manager detected that the system was low on virtual memory, but was unable to swap out any buffers. 124 buffers were considered and 124 were locked. Either not enough memory is available to the pipeline because not enough is installed, other processes are using it, or too many buffers are locked
cherriesh
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Oct 18, 2007
I see following error when I execute a SSIS package as part of a job from within SQL Server
OnInformation,006-CIS-SQL,apdsvcPM2SQL,VistaMain,{F902B487-D543-4F31-AC80-EF088CD0CBA4},{74325B35-DC59-4B51-AE8E-756BCC879633},10/18/2007 6:15:12 AM,10/18/2007 6:15:12 AM,1074036748,0x,The buffer manager detected that the system was low on virtual memory, but was unable to swap out any buffers. 4 buffers were considered and 4 were locked. Either not enough memory is available to the pipeline because not enough is installed, other processes are using it, or too many buffers are locked.
SQL Server has 6 GB memory allocated to it. How can I best troubleshoot this issue?
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Sep 27, 2001
I have a few in house developed application (VB based) that access the SQL server for adding, appending , creating tables. The application does the changes thru queries dynamically generated at the application level.
My MS SQL Server runs on a PIII / 256 MB Ram / 18 GB HDD
The problem is that the memory utilization of SQL server keeps growing constantly. Out of 512 MB (256 Physical + 256 Virtual) available teh memory utilization reaches a level of 490 MB and statys constant. Though SQL Server shows a utilization of 150 MB.
I suspect that SQL is not releasing memory back to the system. Please help in resolving. The problem may lie at the applications developed.
Jdindian
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Sep 25, 2006
hi all
I got a small MSSQL server.. total database file size less than 7GB. with 2G rams installed 2 cpus. but for some reason when i check the task manager process mem usage is over 1.7G. the sql server memory setting in on Dynamically not fixed. and maximum 2G i believe is default. anyway. my question is over 1.7 memory usage is too high? because i dont have alot of transaction going. and cpu usage is very low. wondering if this's normal or not. and if is not normal . what cause the memory usage so high...... and how can i adjust back to normal. ? can anyone help me out? or any suggestion? thanks
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Jan 23, 2006
Hey,
I have a large set of data that I need to match against another large set of data. The reference table has 9.8mill rows and my input has 14.6mill rows. I started with a new project. I added my connection, then a task to clear the result table, then my data flow, then my OLE source, then my Fuzzy Lookup task, then my SQL Server Destination. I set the connection of my OLE source and set the query to pull the data. Then I set the connection of my Fuzzy Lookup task, set the reference table and told it to create a new index (the problem also occurs if I use a generated index) and then set up the matching criteria. Then I set the connection and destination for the SQL Server Destination.
After setting all this up, I hit Run. The thing ran great until ~ 800k rows and then it failed. I ran it several times and it always failed right around 800k with a message saying there was not enough space and then an error with buffers being passed to the Fuzzy Lookup component. I opened Task Manager and watched the resources as it ran and was amazed at what I saw. The Fuzzy Lookup component eats up every bit of Virtual Memory available and when it can't take any more, it errors out. I tried setting the Max Memory setting on the component and it seems to have no effect. I also played with the buffer settings on the data flow task to no avail. I even went as far as to put an identity on my input table and create a function that outputs selects that use a between on the identity to break the data into 600k chunks. I set up a ForEach component and DTS variables, but the Fuzzy Lookup component does not free the VM after the iteration of the ForEach component!
I ended up running each chunk of 600k one at a time. I have to automate this for the future, so I need a solution. Does anyone have an idea for me?
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Sep 10, 2015
We have Windows Server 2008R2 installed on VM Server.On that we have three SQL instances running. From few past months we are observing physical memory is going high. Earlier we observed it was at 86-88%, now it is 96-97%.We have 16RAM & 8 CPU cores on VM. what is the best and ideal configuration so that we can rectify the high physical memory issue.
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May 2, 2006
Hello,
Question:
How can I keep my thread alive after an out of memory exception? That is, I understand that sometimes a server may be unable to satisfy a memory request, but I'm okay with waiting -- I'm not okay with being terminated (think of the reaction to Oliver asking for some more). I would think that, in general, when any application makes a request for a resource that is currently unavailble, but may be available at another time, that application (process/thread/fiber) would be put in a Wait Queue for that resource. On a high concurrency system, this could obviously lead to deadlocks; however, I think in the situation I describe below, the killing is overkill.
Discussion & Background:
In my project, I have a SqlFunction, we'll call "SqlDecimal BigFunction()" that will allocate a large chunk of memory (~3MB) and can take anywhere from 20ms to 500ms to complete (on my system, assuming no other processor load). There are also Functions that are used to set control points for BigFunction (implying thread/fiber state -- or, if there is a distinction, Transaction state), which we will call "SqlBoolean SetControlPoint(SqlInt32 x, SqlInt32 y)". The 3MB requirement is constant, regardless of the number of control points. (Incidentally, the actual implementations of these functions are in a referenced assembly)
In Code:
////////////////////////////////////////////////////////////////////////////////////////////////////
[ThreadStatic] // UNSAFE
static externalAssembly.MyClass myObj;
[SqlFunction]
SqlDecimal BigFunction()
{
if(myObj == null) return -1;
// DoSomeWork will do something like, byte[] b = new byte[3 * 1024 * 1024];
return externalAssembly.DoSomeWork(myObject)
}
[SqlFunction]
SqlBoolean SetControlPoint(SqlInt32 x, SqlInt32 y)
{
if(myObj == null) myObj = new externalAssembly.MyClass();
myObj.SetPoint(x.Value, y.Value);
return SqlBoolean.True; // because we can't have 'void' return type
}
////////////////////////////////////////////////////////////////////////////////////////////////////
In low to moderate concurrency (single hyperthreaded CPU with 20 sessions banging it in a loop), it *usually* does okay. In a higher concurrency situation (2 hyperthreaded cpus with 10 sessions stressing this code and 10 other sessions doing regular TSQL Selects) It runs for a long time, but will occasionally throw an out-of-memory exception. (Previously, I was managing my thread state manually with a locked dictionary, an Int32 key, and CreateSession/ReleaseSession calls). When an out of memory exception is thrown while the dictionary is locked, I get an AppDomain unload, which is *completely* unacceptable)
So, I know that sometimes, I won't be able to allocate my 3MB (it could be 3kb, it just shows up more readily with a larger allocation request). That doesn't mean my externalAssembly is "misbehaving" or "off-in-the-weeds". It just means the server is loaded right now and can't satisfy my request. One may catch an OutOfMemory Exception (perhaps to add additional info about the point of failure), but the thread is already being aborted.
I tried modifying this implementation to use a buffer pool that is allocated on start-up. That worked pretty well (reduced % Time in GC a bit, also), but it forced my external assembly to be marked as unsafe rather than just external access because of the Synchronization methods used to manage the buffer pool. It also doesn't scale, at least not as it sits. Its just a fixed size buffer pool. With more processors and less peripheral loading, the extra processors would just be waiting for a buffer. Besides that, I thought there was some escalation policy about "waiting too long", but I may be wrong.
I would like to eliminate the "UNSAFE" attribute from the primary assembly -- mainly because it "sounds scary", but more realistically, because it is unsafe! Or at least, experience in the field points to synchronization issues being a primary cause of unreliability in systems. Also, calling the C# lock, Mutex, Monitor etc call into native code to use the OS for locking. When this happens, SQL doesn't really know what you're waiting for and can't take that info into account when scheduling. All it knows is that you're waiting on an OS lock. I thought the hosting API would've allowed the host to optionally implement its own locking primitives, especially a host that runs its own scheduler.
I've looked into constrained execution regions and Chris Brumme's blog entry on hosting. Using them would help ensure some protection, but I think even they do not protect a thread from being unloaded in the face of an OutOfMemoryException (or any asynch exception); rather, they allow you to safely clean up unmanaged references and ensure state integrity for the appdomain.
At any rate, this is getting a little long winded. If anyone has any feedback, I'd be delighted to hear it.
Thank you.
-Troy
System Info:
SELECT @@version
Microsoft SQL Server 2005 - 9.00.2047.00 (Intel X86) Apr 14 2006 01:12:25 Copyright (c) 1988-2005 Microsoft Corporation Developer Edition on Windows NT 5.1 (Build 2600: Service Pack 2)
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Apr 28, 2015
We have a system(32GB RAM and 2 TB hard disk, Windows7,SQL SERVER 2008R2 enterprise 64 bit). Looks like whenever i run some query(even query result 50 records) on the database, the Memory utilization is very high(30 GB) in task manager. How can i control this over usage? The memory setting is default in server properties(min 0 and max 2147483647).
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Oct 25, 2007
[DTS.Pipeline] Information: The buffer manager detected that the system was low on virtual memory, but was unable to swap out any buffers. 12 buffers were considered and 12 were locked. Either not enough memory is available to the pipeline because not enough is installed, other processes are using it, or too many buffers are locked.
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Aug 25, 2015
I know I should probably be posting this in the RS section but I have a Win 2008 R2 server and RS 2012 along with SSIS and Database server installed. I also have SQL 2005 instance with Sql 2005 SSIS running on the server.
I saw that Reporting services was consuming 9gb of ram a few days ago with no published reports. It's just a default install.
So I investigated the settings and the document: [URL]......
I added this section to the reportserver.config file to restrict memory usage
<WorkingSetMaximum>512000</WorkingSetMaximum>
<WorkingSetMinimum>128000</WorkingSetMinimum>
Any example altering the reportserver.config file in your standard build of sql server reporting services?
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Nov 6, 2007
My Sql express will use up to 1G or more memory and never release.
I had the same problem on SQL 2005 standard, I solved by adding /3G in boot.ini and turn on AWE.
but it seems SQL express doesn;t support AWE. so how could I do here?
thanks
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Mar 26, 2015
We have two server configured in always on mode .
windows is sql server 2012 64 bit edition and sql server is 2012 64 bit edition.
RAM installed on both server is around 65 gb of which 49 gb is max server memory allocated for sql services on both servers.
database related to reporting services are also in always on group .
We have also configured for reporting services and both are running on their respecting server.
Issue is on primary server reporting service is using almost 7 gb while on secondary it is using 10 gb even when there are 5 reports and its used within offices .
what issue and how to check why ssrs is using high memory..
any query , perfmon counters
reports are randomly used at client side
i have checked memory utilization through task manger..
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Apr 23, 2007
Hi,
Is there a way to configure mirroring to go from High Availability to High Protection without having to reconfigure Database Mirroring? Using the interface in Management Studio, I can change the configuration option to High Performance, but not High Protection despite both of them being Synchronous.
If not, what are the recommended steps to configure the mirror once it already has been configured? Is just like initially setting up the mirror or would there be any shortcuts I could take? If I stop the mirroring and remove the witness, will the High Protection option be available?
Thanks,
J.
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Mar 6, 2008
Hi There
I realise this is a stupid quesiton but i cannot really find any confirmation of this in BOL.
If you are running High Safety with automatic failover, when failover occurs does this automatically change to High Performance mode. SInce for failover to occur something has happen with the primary , it will be impossible to commit transactions on the new primary and mirror asyncronously since 1 of them is no longer available.
So am i correct in assuming that automatic failover also automatically changes the mode to High Performacne for that session?
Thanx
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Aug 2, 2006
Hi
I did a load testing and found the following observations:
1. The Memory:Pages/sec was crossing the limit beyond 20.
2. The Target Server Memory was always greater than Total Server Memory
Seeing the above data it seems to be memory pressure. But I found that AvailableMemory was always above 200 MB. Also Buffer Cache HitRatio was close to 99.99. What could be the reason for the above behavior?
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Aug 22, 2007
sql server 2000 is running on windows server 2003 ... 4gb of memory on server .... 2003 was allocated 2.3gb nd sql server was allocated (and using all of it) 1.6gb for total of approx 4gb based on idera monitor software ... all memory allocated betweeen the OS and sql server .... then 4 more gb of memory added for total now of 8g ... now idera monitor shows 1.7gb for OS and 1.0 gb for sql server ..... 'system' info shows 8gb memory with PAE ... so I assume that the full 8gb can now be addressed .... why are less resources being used now with more total memory .... especially sql server ..... i thought about specifying a minimum memmry for sql server but i amnot convinced that would even work since it seems that this 1gb limit is artificial .... it it used 1.6 gb before why would it not use at least that much now ??
thank you
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Mar 24, 2008
What is a virtual server?In my new job,my boss mentioned about moving the websites from a physical server to a virtual server.Why is this done or needed?
Also he insists that I buy and install SQL server 2000 enterprise edition in my laptop and use the enterprise manager to access their server.Can't I just download the client tools from their SQL package and be able to access their server?Do I need a CAL or is it just enough to have a permission in their network for my laptop?
Can anybody throw some light here please?Thanks!
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Aug 17, 2007
I really need some help. This is what I'm trying to do: first of all, i have a PC running Vista. Now on that PC, i have a virtual machine using VMWare Workstation 6, which has Win XP with SP2 installed on it. On the virtual machine, i have Visual Studio 2005 and SQL Server 2005 Express Edition with SP2; now, the thing is, i have a program in C#, which is supposed to connect to a network, but since I'm running on just one PC which is not connected to a network, i instead connect to 127.0.0.1 via port 1433. Now here's where my problems start. At first, i could not connect because i kept receiving an error which said "An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provedier: TCP provider, error: 0 - No connection could be made because the target machine actively refused it.)". A friend of my mine helped, so i did the following: i went into SQL Server Surface Area Configuration (configuration for localhost) , changed the remote connections to allow for both local and remote, using both TCP/IP and named pipes, restarted the database engine, started the SQL Server Browser; then i went to administrator tools, Data Sources (ODBC), and from System DSN tried to add an SQL Server. I gave it a name, and on the server textbox i tried typing "localhost", but doing so, i could not get past the next screen, (i did specify the port as 1433) where i have to chose between win nt and sql server authentication, and neither would work (even though i know the sa password and can log on to SQL Management Studio using that password). Then i tried copying the server name from the management studio, as the server when trying to add the system DSN. That seems to have worked, and i finished ading the SQL Server to the System DSN, using the database which i wanted. But after all these steps, i still get the exact same error as before - "An error has occurred while establishing a connection to the server.
When connecting to SQL Server 2005, this failure may be caused by the
fact that under the default settings SQL Server does not allow remote
connections. (provedier: TCP provider, error: 0 - No connection could
be made because the target machine actively refused it.)".If someone can please help - i've tried everything i can think of - i can access the internet from the virtual machine, i even tried disabling the firewall, but no luck. Is it because of the virtual machine? If so, can anyone suggest a solution? I actually doubt it, because i've even tried to install it on my pc, not the virtual machine, so on vista - and also installed SP1 for VS 2005 and SP1 for Vista, but still the same thing. Sorry for making this post so long, but if anyone can help, i'd really appreciate it. Thanks!
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