Memory Bottleneck?
Feb 15, 2005
I am trying to figure out if we have a memory bottlneck on our SQL Server. We have a large database (90 GB) on Standard Edition of SQL 2000. Currently we have 2 GB of Memory. To me this seems low already, but Standard edition can't handle more than 2 GB anyway. Our cache hit ratio is very low (40%). This is also telling me we need memory. The thing that gets me is we still have 147 MB of memory available. If Memory really was the problem wouldn't that 147 MB be used?
Thanks much.
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Mar 18, 2004
Hi,
We have been getting really bad performance from one of our databases recently.
This is a three tier system with two services (.dll) connecting to the database, we have only experienced problems since the second service has been installed.
These two services both use the same user and make about 300 connections to the database.
I have noticed IO bottleneck when the system is under load, and the Average disk queue at this time is 15.
How do I fix this? We have the logs and data on the same raid 10 array.
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Mar 29, 2007
Hello,
I have an SP that transfers data from one DB to another.
As I run the SP with the management studio - it takes about 15min. But when I scheduled it as an SQL agent job it ran all night and never completed.
The difference I noticed was that the % disk time (of the destination DB) was very high (~100) when I used the agent (which never happened when I ran the SP with the studio).
Only when I restart the SQL service, the disk gets back to normal % disk time.
What could be the reason for that?
My server - Windows 2003 R2 SP1 / SQL 2005 SP2
p.s - could it be related to SQL SP2 ? I didn't have this problem with SP1, but then - I had many other changes since.
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Aug 6, 1999
Good morning,
I've just updated my databases to V7.0 from 6.5. I am having some issues with CPU utilization after rebuilding the databases. I rebuilt the databases from scripts after modifying the scripts to deal with any SQL issues between the versions.
Symptoms:
When a bunch of stored procedures are executed the % Processor Time his 100% on a single processor system, the Processor Queue Length hits 13, the Batch Request/Sec starts at 20 and rises to 47 before dropping off, Context Switches go from 370/sec to about 833/sec before dropping off and there is an increase in page faulting.
My testing was done on a single processor but my real system is dual-300+ with 128Mb RAM. The database is only 40Mb and after running the index wizard there were no changes advised.
After reading a lot in help areas for MS and here I am not sure if this has to do with how SQL Server runs now (i.e. system configuration) or if it is a query issue with parallelism. I'm assuming query parallelism since the performance spikes occur when stored procedures are run. On a single processor is there a way to address this. Then, hopefully, I can deal with the real multiprocessor system.
Thanks much,
Don
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Jul 20, 2005
I understand that there is much involved in figuring up I/Othroughput, but I'm hoping the answer to the following question willbe a simple A, B OR C.Given the configuration below, what hardware component wouldbottleneck first.A. Drive Spindle ThroughputB. SCSI ControllerC. Other Component(if so what component?)Configuration:Controller: Ultra320RAID Config: RAID 5Drives on RAID: 14 - 73gb/15k - SCSI DrivesType of Writes: RandomQuestion Background:I currently have the configuration above on a local box. Our companyhas ordered a SAN and and has space set aside. What I'm trying toacertain is whether or not I'd be better off staying local or ifputting my DB on a SAN would be more beneficial.Other Notes:I've determined using a formula that determines the max theoreticalI/O operations/sec for the # of drives (spindles) and RAID Config...but I've not been able to establish a relationship betweenOperation/sec -> MB/Sec. I'm sure this is for obvious reasons...If anyone has had a related scenario, I'd be interested in hearingyour thoughts.Thanks,Ornac
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Jul 13, 2015
I am looking to test this feature - and the "Transaction Performance Collector" has recommended me a table to port to In-Memory OLTP.
I have now tried the "Table Memory Optimization Advisor" tool.
After a couple of tweaks to the table design - the tool is now passing validation but the tool is not allowing to progress to the next step:
Could it be down to not having enough memory? But would this not show in the advisor?
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Sep 28, 2007
Hello. I have received the follwoing error upon an attempt to Browse the Cube. All other tabs are functional, including the Calculations tab. We are running Windows Server 2003 SP2 and SQL Server 2005 SP2. Any suggestions would be greatly appreciated!
**EDIT** - Have confirmed SP1 for VS2005 is installed both locally and on server, also.
Attempted to read or write protected memory. This is often an indication that other memory is corrupt. (Microsoft Visual Studio)
------------------------------
Program Location:
at Microsoft.Office.Interop.Owc11.PivotView.get_FieldSets()
at Microsoft.AnalysisServices.Controls.PivotTableFontAdjustor.TransformFonts(Font font)
at Microsoft.AnalysisServices.Browse.CubeBrowser.UpdatePivotTable(Boolean translate)
at Microsoft.AnalysisServices.Browse.CubeBrowser.UpdateAll(Boolean translate)
at Microsoft.AnalysisServices.Browse.CubeBrowser.InitialUpdate()
at Microsoft.AnalysisServices.Browse.CubeBrowser.SupportFunctionWhichCanFail(FunctionWhichCanFail function)
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Oct 11, 2007
I've been researching AWE to determine if we should enable this for our environment.
Currently we have a quad core box with 4 gb of RAM (VMware). OS: Windows 2003 std, SQL Server 2005 std. 3GB is not set but will be as soon as we can perform maintenance on the server.
I have read mixed feedback on AWE, either it works great or grinds you to a hault. I would assume that the grinding to a hault is due to not setting the min/max values correctly or not enabling the lock page in memory setting.
We only have one instance of SQL on the server and this box won't be used for anything else aside from hosting SQL services. We do plan on running SSRS off of this server as well.
1. Will running SSRS and enabling AWE cause me problems? Will I have to reduce the max setting by the SSRS memory usage or will it share and play nice?
2. How do I go about setting the Max value? Should it be less than the physical RAM in the box? Right now its set to the default of 214748364, even if I don't enable AWE should this default value be changed?
3. It seems that even at idle the SQL server holds a lot of memory and the page file grows. If I restart the process in the morning, memory usage in taskmon is at 600mb or so. By the end of the day, its up around 2gb. How can I track down whats causing this, should this even concern me?
4. The lock Page in memory setting worries me. Everything I've read on this seems to give a warning about serious OS and other program support degradation. In some cases to the point where they have to restore the settings on the server before they can bring it back up. What are your thoughts on this.
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Aug 28, 2015
I have a Windows sever 2012 with sql server 2012 enterprise. Ram size is 22GB. Sometimes SQL sever takes 95% memory.My question, How to reduce memory size without killing any process because it's production server.So there are many background process is running. And,Is there any guides to learn why Memory is raise d so high and how to reduce it.
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Mar 27, 2008
Hello, I understand that we should use SSMS -> Server Properties -> Memory to put a cap on the SQL server memory usage, therefore it gives some space memory for OS, this is based on the fact if the max memory is not specified, SQL will use whatever available memory and eventually crash the system.
My question is that when a server has SSIS and SSAS services installed along with the SQL service. Would the max memory setting covers the SSIS and SSAS memory usage, or the SSIS and SSAS has to shared the memory with OS?
Thanks,
fshguo.
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Dec 6, 2006
I am running Visual Studio 2005. I have an SSIS Package which is consuming a huge amount of memory. During the execution of the package the memory keeps increasing. Until finally i get an Out of Memory exception. I have run this package using dtexec, and in the BIDS. No difference. I do have some script components and have added some code to get the assemblies in the current appdomain. I do see that one particular assembly is increasing on every loop. VBAssembly every time it hits the script component is increasing by 6, and along with it the memory is climbing. What is this VBAssembly being used for is there an update to SQL Server Integration Services that I need?
Thanks! Aaron B.
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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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Oct 4, 2015
i want to create a lot of index for my database for performance.but i need find memory usage by indexes.
How to find memory usage by index in sql server?
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Jun 15, 2015
I've a database with a memory optimized filegroup on it. How can I remove it?I have removed the memory optimized table I had on it, but when I try to remove the filegroup I receive an error.
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Jul 17, 2006
Hi,
I am going to install SQL Server 2000 (then SQL 2K5) on a Win Server 2K3 with 8 GB of ram, but it will be 16 GB in the near future.
I would like to reserve a fixed memory (for momemt less than 3-4 GB) for SQL Server and the rest for application (virtualization).
Without AWE enabled, max memory for SQL Server 2K5 is 4GB as for SQL Server 2000?
How can I manage and optimize memory keeping in mind AWE. (any doc, website available?)
Thank
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Feb 10, 2015
So I started a new job recently and have noticed a few strange configurations. Typically I would never mess with min memory per query option and index create memory option configuration because i just haven't seen any need to. My typical thought is that if it isn't broke... They have been modified on every single server in my environment.
From Books Online:
• This option is an advanced option and should be changed only by an experienced database administrator or certified SQL Server technician.
• The index create memory option is self-configuring and usually works without requiring adjustment. However, if you experience difficulties creating indexes, consider increasing the value of this option from its run value.
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Mar 20, 2008
Hello frnds Can Anybody explai what does it mean by question itself and how to resole it ?
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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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Feb 15, 2007
Hi~, I have 3 questions about memory based bulk copy.
1. What is the limitation count of IRowsetFastLoad::InsertRow() method before IRowsetFastLoad::Commit(true)?
For example, how much insert row at below sample?(the max value of nCount)
for(i=0 ; i<nCount ; i++)
{
pIFastLoad->InsertRow(hAccessor, (void*)(&BulkData));
}
2. In above code sample, isn't there method of inserting prepared array at once directly(BulkData array, not for loop)
3. In OLE DB memory based bulk copy, what is the equivalent of below's T-SQL bulk copy option ?
BULK INSERT database_name.schema_name.table_name FROM 'data_file' WITH (ROWS_PER_BATCH = rows_per_batch, TABLOCK);
-------------------------------------------------------
My solution is like this. Is it correct?
// CoCreateInstance(...);
// Data source
// Create session
m_TableID.uName.pwszName = m_wszTableName;
m_TableID.eKind = DBKIND_NAME;
DBPROP rgProps[1];
DBPROPSET PropSet[1];
rgProps[0].dwOptions = DBPROPOPTIONS_REQUIRED;
rgProps[0].colid = DB_NULLID;
rgProps[0].vValue.vt = VT_BSTR;
rgProps[0].dwPropertyID = SSPROP_FASTLOADOPTIONS;
rgProps[0].vValue.bstrVal = L"ROWS_PER_BATCH = 10000,TABLOCK";
PropSet[0].rgProperties = rgProps;
PropSet[0].cProperties = 1;
PropSet[0].guidPropertySet = DBPROPSET_SQLSERVERROWSET;
if(m_pIOpenRowset)
{
if(FAILED(m_pIOpenRowset->OpenRowset(NULL,&m_TableID,NULL,IID_IRowsetFastLoad,1,PropSet,(LPUNKNOWN*)&m_pIRowsetFastLoad)))
{
return FALSE;
}
}
else
{
return FALSE;
}
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Nov 13, 2006
If I install SQL 2005 Standard on Windows 2003 Standard, is SQL limited to 4 gigs of physical RAM?
I'm planning a new system that will run SQL 2005 Standard edition on a Windows 2003 Standard platform. The spec calls for 8 GB of RAM. My experience would lead me to suspect I need to install Windows 2003 Enterprise to take advantage of all the installed memory.
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Feb 9, 2005
We have a box with dual Intel Xeon 3.4GHz processors, and 8GB RAM, OS and Data on separate RAID5 arrays. It runs:
MS Win2k3 Enterprise for the OS,
MS SQLServer 2k Enterprise for DB,
MS SQL Analysis Services for OLAP,
MS SQL Reporting Services for reports distrib,
MS IIS for web hosting,
SPSS OLAPHub for OLAP web UI, and other small stuff...
My question is this: How should the memory be configured? Should we use the OS' /3GB switch or are there enough apps running here for the OS to need 2GB to track them? What SQLServer switches would you run? I'm not sure that I want to lock more that 3-4GB of SQL data pages into memory and starve the other pigs... How could I set this up to keep 2GB for the OS and yet really use the remaining 6GB most effectively?
All input is sincerely appreciated.
Robert
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Mar 26, 2001
I had the drives switched out on my sever this weekend and the memory is
running at a consistent 100%.
OS: NT Server 4.0 SP6
SQL Server 7.0 SP1
Drives:
From: 60gb To: 210gb
Memory: 1gb (will be increasing to 2gb)
Pagefile: 3gb
Can anyone tell me why or what would be causing all the memory to be
used?
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Aug 3, 2000
I have been tracking SQL's memory usage over the past few months with Perfmon. I have noticed a trend that little by little "% Committed Bytes in Use" creeps up starting at 8% and eventually climing as high at 35%. I stop and start the SQL services and the total comes back down to 8%. This happens over a week and a half or two week period. Is this normal SQL activity?
Thanks for your help!
DOUG
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Dec 14, 2000
I am going to purchase a new server to run Eastman's OpenImage software's CATALOG database. Our current server is SQL 6.5,
but it is not able to be upgraded to SQL 7.0 (known bug with this particular HP server). So I am going to buy a new one. My question is
where to find documentation that could recommend how much memory to purchase for this server. I can find scads of documents
detailing how much RAM to give SQL given a fixed amount of RAM on your server, but nowwhere can I find how much RAM to get when
buying a new server.
Any tips?
Thanks,
Joe
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Nov 15, 2000
hi, i have a dell server with 4 xeon processors, 4GB RAM, running sql 7 ent ed sp2 on win2k advance server (dedicated sql server). configured my sql to dynamically configure memory. i've been monitoring the memory usage using task manager and the most sql will use is up to 2GB even on very heavy loads. why? everything i read on sql 7 ent ed tells me that it should be able to take advantage of up to 8GB of memory. also, the readings i did on win2k advance server says it supports PAE (Intel's Physical Address Extension). why isn't it using the other 2GB or at least another 1GB? if it's not able to use it, then my co's investment on the other 2GB RAM is wasted! please help!
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May 19, 2000
For a 2 gig machine(running SQL only) how much should be allocated to
SQL and NT? The old chart and formular Microsoft had went up to 512 and
was more of a guess.
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Apr 24, 2003
If I have a SQL Server Ent Edition 2000 running on Win2000 Server, and the server has 4 gig of memory, am I correct that I can set SQl Server to use upto 3 gig of memory, but not use AWE? I thought I could use the setting "4GB RAM: /3GB (AWE support is not used)" in the boot.ini file
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Sep 2, 1999
For a dedicated NT machine for SQL Server with a 2.3gb of RAM, how much memory should I allot for the SQL server.
Should I configure the sql server with 2.3GB-64MB = 1.66 GB of memory?
Thanks.
vic
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Aug 24, 1999
What would be a good memory setting for SQL Server that's running
on a NT machine(of 512MB physical memory) by it self? currently the
memory parm is set at 437563, and users are getting a lot of time out errors
when they are running their VB app.
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Nov 12, 1998
If we have a SQL Server with 2GB of RAM and a database that's only 1.5GB in size (indexes included) will the entire database be loaded into RAM making for lightning performance?
Lastly, is the answer different if you're using SQL7.0 instead of SQL6.5?
Kevin
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Aug 27, 2002
I just upgraded from SQL Server 7.0 to 2000. My server is now using 700 MB of memory for sqlservr.exe as opposed to 110 MB. Why does SQL Server 2000 use so much more memory? Is there a leak?
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Feb 19, 2001
Hi,
Does anyone know thw maximum memory limit of SQL 6.5 (NT 4.0).
Thanks in advance
Joe
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Jun 25, 2004
Hie,
When i restrict the memory of the db in property dialog box, the process sqlserv.exe increase his memry above this limit why ?
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