MSSQL 2000 SP4 Memory Leak

Oct 5, 2005

Greetings all!

On one of our intranet SQL servers running under Windows 2000 SP 3,
MSsql 2000 SP4 seems to gradually "eat" away all available memory (with no obvious reason for it) until a certain limit is reached, forcing the server to slow down substantially since the OS has to SWAP continuously.

I would appreciate any suggestions at this point on how to tackle this problem :)

Thank you!
VincentJS

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How Do You Troubleshoot Memory Leak Issues? What Tools Can Use To Diagnose Memory Leak Problems? In MS SQL ?

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Hello frnds Can Anybody explai what does it mean by question itself and how to resole it ?

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Hi,
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Does anybody knows anything regarding memory leaks in MSSQL2000?

How can I find what version of service pack have I installed in a MSSQL2000 server machine?

Regards,
Manolis

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Mar 30, 2005

Hello all,

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I'm not a DBA, so I'm hoping this may be happening because of some (unknown to me) option that is not currently enabled/disabled on the SQL Server. My only other thoughts at this time are that maybe it's a bad install of SQL, or perhaps bad RAM? Any supporting/disproving thoughts? Any similar situations?

Any help with this would be greatly appreciated.

Thank you in advance,
AtomicChip

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Oct 26, 1999

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Dear Support,

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Nov 19, 2007

I believe that I may have a memory leak. I loaded a job into a scheduling engine and had it run every 15 minutes over the weekend. It ran successfully everytime untill sunday mid-day. That is when I started getting memory issues.

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Hi,

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Ian

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Mar 20, 2006

I was doing a quick test with SQL Server Express and noticed that there is memory leak

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Feb 27, 2007

Hi, there;
I have a couple of issue that really frustrates me. I asked a similar question before but I haven't resolved it yet.
My application was developed with VS2003, c#,CF1.0,Sp1.

I found that after my application runs for a couple of hours, my SqlCeDataAdapter.Fill() method throw exception "Error Code: 8007000E Message : Not enough storage is available to complete this operation.". I found a couple of threads on the website said that I have to dispose adapter object (including its command objects.) Yes, I did!!!. And I also dispose my SqlCeConnection before it is out of range and recreate it when I need it. See:http://www.tutorials-se.com/sqlserverce/Keeping-SqlCeConnection/

I also introduced hotfix from http://support.microsoft.com/Default.aspx?kbid=827837.
It looks like I tried everything, but I still has this exception.

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Hopefully I make myself clear.
So my question is:
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2. How can I know memory or stack are corrupted/How to trace.

Again, thanks Mr.Ilya, you do a great job here, you are really really helpful!

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May 2, 2007

Hi,
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Questions:
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Any help with this matter would be very much appreciated.
Thank you for your time.
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Jeff 
 

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Dec 1, 1999

Hi all,

I have a couple of client programs continuously dumping data into a SQL 7.0 database. I use ODBC connections that remain open as long as the client programs are running.

The memory consumed by SQL grows until all the system memory is consumed at which point the clients freeze (SQL no longer responds). Restarting SQL Server "cures" the problem for a few hours.

I've tried limiting the amount of memory used by SQL, but this only accelerates the eventual client freeze-up. At the moment, I let SQL dynamically consume memory.

These same client programs ran fine under 6.5

Thanks for any help..

SQL 7.0/SP1
P3-500
256MB

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Jul 20, 2005

Hi everybody !I´m maintaining a large intranet (approx 10000 concurrent users) running onone IIS box and one DB box with sqlserver 2000.Currently there is 2,5 GB Ram, 1 1400 mhz cpu and 2 scsi disks installed onthe db box.Sqlserver is set to use max 1,4 GB RAM, and the sqlserver does not seem tobe using it all.Currently SQLSERVER 2000 crashes at least once a day.Its very weird, I run performance monitor with counters on, memory, diskusage, num users, locks and such.There is no indications in the counters before the crashes, they just happenvery sudden.Only indication is that sqlserver makes some huge jumps in memory usage andmostly the sqlserver then crashes an hour or 2 later.The only thing that peaks a lot are the locks/sec counter.My analysis of disk usage, queues etc. tells me i got no kind of i/obottlenecks.Can anybody give me a clue as to what i should do ?Best regards, Thue

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Jul 20, 2005

Hello,I am having trouble with a production db server that likes to gobbleup memory. It seems to be a slow burn (maxing out over about an 18hour time frame, before pegging both procs on the server and bringingeverything to a standstill). After viewing the trace logs, it appearsthat all the SPIDs are being recycled - does this assert thatconnections are being properly closed when the need for them hasended? The code base is huge and quite messy, so it's difficult todiscern where the problem is just by looking at code, and we can'tseem to nail it down by looking at it, and I'm not sure what to lookfor in the trace logs or perfmon.Does anyone have any suggestions about what else might cause such aproblem?Ryan

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Memory Leak When Using IRowsetIndex::GetIndexInfo

Dec 4, 2007

This doesn't seem to be documented anywhere.

When you call IRowsetIndex::GetIndexInfo, it allocates memory for an array of DBINDEXCOLUMNDESC structures, which the documentation says to free using IMalloc::Free. However it does not say to free the pColumnId member of each DBINDEXCOLUMNDESC (which is a DBID*), or the pointer members of pColumnId. I think that if you don't do this, you will have a memory leak.

I used the following code to completely free the DBINDEXCOLUMNDESC structures:



Code Block
inline void FreeDBIDMembers(DBID &dbid)
{
switch(dbid.eKind)
{
case DBKIND_GUID_NAME:
case DBKIND_NAME:
if(dbid.uName.pwszName != NULL)
CoTaskMemFree(dbid.uName.pwszName);
break;
case DBKIND_PGUID_NAME:
if(dbid.uName.pwszName != NULL)
CoTaskMemFree(dbid.uName.pwszName);
if(dbid.uGuid.pguid != NULL)
CoTaskMemFree(dbid.uGuid.pguid);
break;
case DBKIND_PGUID_PROPID:
if(dbid.uGuid.pguid != NULL)
CoTaskMemFree(dbid.uGuid.pguid);
break;
}
}
// Used to free memory allocated by IRowsetIndex::GetIndexInfo
inline void FreeDBINDEXCOLUMNDESC(DBINDEXCOLUMNDESC *pColDesc, ULONG nColumns)
{
if (!pColDesc)
{
return;
}
DBINDEXCOLUMNDESC *pColCur = pColDesc;
for(unsigned int i = 0; i < nColumns; ++i, ++pColCur)
{
if (pColCur->pColumnID)
{
FreeDBIDMembers(*pColCur->pColumnID);
CoTaskMemFree(pColCur->pColumnID);
}
}
CoTaskMemFree(pColDesc);
}



I used CoTaskMemFree rather than IMalloc::Free as I am working with Pocket PC. Thanks also to Joao Paulo Figueira who has documented a fix to a similar memory leak, which was my inspiration for finding and fixing this one! If you are using Figueira's CRowsetIndex, part of his adapted ATL OLEDB templates for Pocket PC, then you are likely to have this leaky code too.



Can anyone confirm this is correct?

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Aug 13, 2007

Hi,
The server is on win 2003 server with sql server 2005 workgroup sp2
ram is 2 GB.
the SQL start with 100MB and 100MB VM and after two days of regular and not massive work
the SQL memory goes up to 1GB ram and 1GB VM

how can i know who is the process that cuase the SQL memory to incress

is it somthing usual for sql 2005 to go up to 2 GB mem?

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Oct 9, 2007

Env. eVC++4.0 / SQLCE3.0 / PDA OS : WinCE5.0


I modifed some sample source (NorthwindDB and downloaded source... etc)


It looks like working very well.. but system memory continuously increase when execute query.

So, I tested memory usage after ConnectDB and DisConnectDB. (just connect/disconnect)

Result, memory increased similarity.



Before system memory usage : 13068 KB

1st.
After ConnectDB : 14160 KB
After DisconnectDB : 13156 KB (increase about 88KB)


2nd.
After ConnectDB : 14164 KB
After DisconnectDB : 13160 KB


3rd.
After ConnectDB : 14168 KB
After DisconnectDB : 13164 KB




I don't know what has caused the problem.

Needs your comment... Thanks in advance.





Code Block
// GLOBAL VARIABLE
// Provider Interfaces
IDBInitialize *pIDBInitialize = NULL;
IUnknown *pIUnknownSession = NULL;

IDBCreateSession *pIDBCreateSession = NULL;
IDBProperties *pIDBProperties = NULL;

// SQL query command text handle object
IDBCreateCommand *pIDBCrtCmd = NULL;
ICommandText *pICmdText = NULL;



HRESULT CPBCls::ConnectDB(LPTSTR lpszDBName)
{
HRESULT hr = NOERROR;

DBPROPSET dbpropset[2]; // Property Set used to initialize provider
DBPROP dbprop[2]; // property array used in property set to initialize provider
DBPROP sscedbprop[1];


// Create the SQL Server CE provider
hr = CoCreateInstance(CLSID_SQLSERVERCE_3_0,
0,
CLSCTX_INPROC_SERVER,
IID_IDBInitialize,
(void**)&pIDBInitialize);

if(FAILED(hr))
AfxMessageBox(_T("CoCreateInstance Failed!!"));

VariantInit(&sscedbprop[0].vValue);
VariantInit(&dbprop[0].vValue);
VariantInit(&dbprop[1].vValue);

// Initialize a property with name of database
dbprop[0].dwPropertyID = DBPROP_INIT_DATASOURCE;
dbprop[0].dwOptions = DBPROPOPTIONS_REQUIRED;
dbprop[0].vValue.vt = VT_BSTR;
dbprop[0].vValue.bstrVal = SysAllocString(lpszDBName);

// Validation
if(NULL == dbprop[0].vValue.bstrVal)
{
hr = E_OUTOFMEMORY;
goto CleanExit;
}

// Specify the property with name of the database
dbprop[1].dwPropertyID = DBPROP_INIT_MODE;
dbprop[1].dwOptions = DBPROPOPTIONS_REQUIRED;
dbprop[1].vValue.vt = VT_I4;
dbprop[1].vValue.lVal = DB_MODE_READWRITE;

// Specify the property for TRANSACTION COMMIT MODE --------- it seems does not work
// sscedbprop[0].dwPropertyID = DBPROP_SSCE_TRANSACTION_COMMIT_MODE;
// sscedbprop[0].dwOptions = DBPROPOPTIONS_REQUIRED;
// sscedbprop[0].vValue.vt = VT_I4;
// sscedbprop[0].vValue.lVal = DBPROPVAL_SSCE_TCM_FLUSH;
sscedbprop[0].dwPropertyID = DBPROP_SSCE_FLUSH_INTERVAL;
sscedbprop[0].dwOptions = DBPROPOPTIONS_REQUIRED;
sscedbprop[0].vValue.vt = VT_I4;
sscedbprop[0].vValue.lVal = 1;


// Initialize the property set
dbpropset[0].guidPropertySet = DBPROPSET_DBINIT;
dbpropset[0].rgProperties = dbprop;
dbpropset[0].cProperties = sizeof(dbprop)/sizeof(dbprop[0]);
//Initialize property set DBPROPSET_SSCE_SESSION --------- it seems does not work
// dbpropset[1].guidPropertySet = DBPROPSET_SSCE_SESSION;
// dbpropset[1].rgProperties = sscedbprop;
// dbpropset[1].cProperties = sizeof(sscedbprop)/sizeof(sscedbprop[0]);
dbpropset[1].guidPropertySet = DBPROPSET_SSCE_DBINIT;
dbpropset[1].rgProperties = sscedbprop;
dbpropset[1].cProperties = sizeof(sscedbprop)/sizeof(sscedbprop[0]);



// Set the properties into the provider's data source object.
hr = pIDBInitialize->QueryInterface(IID_IDBProperties, (void **)&pIDBProperties);
if(FAILED(hr))
{
goto CleanExit;
}



hr = pIDBProperties->SetProperties(sizeof(dbpropset)/sizeof(dbpropset[0]), dbpropset);
if(FAILED(hr))
{
goto CleanExit;
}

// Free the used memory
SysFreeString(dbprop[0].vValue.bstrVal);


// Initialize the SQL Server CE provider.
hr = pIDBInitialize->Initialize();
if(FAILED(hr))
{
goto CleanExit;
}

// Create new database session...
hr = pIDBInitialize->QueryInterface(IID_IDBCreateSession, (void **)&pIDBCreateSession);
if(FAILED(hr))
{
goto CleanExit;
}

hr = pIDBCreateSession->CreateSession(NULL, IID_IUnknown, &pIUnknownSession);
if (FAILED(hr))
{
goto CleanExit;
}



CleanExit:
// Release the used memory
VariantClear(&dbprop[0].vValue);
VariantClear(&dbprop[1].vValue);
VariantClear(&sscedbprop[0].vValue);

free(&dbprop[0].colid);
free(&dbprop[1].colid);
free(&sscedbprop[0].colid);
free(&dbpropset[0].rgProperties);
free(&dbpropset[1].rgProperties);
free(&dbpropset[0]);
free(&dbpropset[1]);

CoTaskMemFree(&dbpropset[0].rgProperties);
CoTaskMemFree(&dbpropset[1].rgProperties);
CoTaskMemFree(&dbpropset[0]);
CoTaskMemFree(&dbpropset[1]);


if(pIDBProperties != NULL)
{
pIDBProperties->Release();
pIDBProperties = NULL;
}

if(pIDBInitialize != NULL)
{
pIDBInitialize->Release();
pIDBInitialize = NULL;
}


if (FAILED(hr))
{
DisconnectDB();
}

return hr;
}


HRESULT CPBCls::DisconnectDB(void)
{
if(pIDBCreateSession != NULL)
{
pIDBCreateSession->Release();
pIDBCreateSession = NULL;
}

if(pIUnknownSession != NULL)
{
pIUnknownSession->Release();
pIUnknownSession = NULL;
}

if(pIDBProperties != NULL)
{
pIDBProperties->Release();
pIDBProperties = NULL;
}

if(pIDBCrtCmd != NULL)
{
pIDBCrtCmd->Release();
pIDBCrtCmd = NULL;
}

if(pICmdText != NULL)
{
pICmdText->Release();
pICmdText = NULL;
}

// Release interfaces
if(pIDBInitialize != NULL)
{
pIDBInitialize->Release();
pIDBInitialize = NULL;
}


return S_OK;
}



INT CPBCls::ReadSimpleData(ST_SIMPLE_DATA *strSimpleData, int *iDataCount)
{

HRESULT hr = NOERROR;

// for Rowset Process
INT iTotalRows=0;
CString temp;
CHAR *temp2;

ULONG lColumn = 0;
ULONG lNumCols = 0;
ULONG lCount = 0;
ULONG lNumRowsRetrieved = 0;
ULONG ConsumerBufColOffset = 0;

IAccessor *pIAccessor = NULL;
IColumnsInfo *pIColumnsInfo = NULL;
DBCOLUMNINFO *pDBColumnInfo = NULL;
DBBINDING *pBindings = NULL;

HACCESSOR hAccessor = NULL;
HROW hRows[10];
HROW *pRows = &hRows[0];
BYTE *pBuffer = NULL;
WCHAR *pStringsBuffer = NULL;



TCHAR szBuff [2048] = {NULL};



ConnectDB();


memset(szBuff, TEXT(''), sizeof(szBuff));
wsprintf(szBuff,
TEXT("SELECT ID, Name FROM Sample_Table ORDER BY Name"));

hr = pIUnknownSession->QueryInterface(IID_IDBCreateCommand, (void**)&pIDBCrtCmd);
if (FAILED(hr))
{

goto CleanExit;
}

hr = pIDBCrtCmd->CreateCommand(NULL,
IID_ICommandText,
(IUnknown**)&pICmdText);
if(FAILED(hr))
{

goto CleanExit;
}

hr = pICmdText->SetCommandText(DBGUID_SQL, (LPTSTR)szBuff);
if(FAILED(hr))
{

goto CleanExit;
}



// Execute the SQL query statement
hr = pICmdText->Execute(NULL,
IID_IRowset,
NULL,
NULL,
(IUnknown **)&pIRowset);
if (FAILED(hr))
{


goto CleanExit;

}


//////////////////////////////////////////////////////////////////////////
// START Rowset Process
//////////////////////////////////////////////////////////////////////////
hr = pIRowset->QueryInterface(IID_IColumnsInfo, (void **)&pIColumnsInfo);
if(FAILED(hr))
{
goto CleanExit;

}


pIColumnsInfo->GetColumnInfo(&lNumCols,

&pDBColumnInfo,
&pStringsBuffer);


pIColumnsInfo->Release();

pBindings = new DBBINDING[lNumCols];

for(lCount=0; lCount<lNumCols; lCount++)
{


pBindings[lCount].iOrdinal = lCount+1;
pBindings[lCount].obValue = ConsumerBufColOffset;
pBindings[lCount].pTypeInfo = NULL;
pBindings[lCount].pObject = NULL;
pBindings[lCount].pBindExt = NULL;
pBindings[lCount].dwPart = DBPART_VALUE;
pBindings[lCount].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
pBindings[lCount].eParamIO = DBPARAMIO_NOTPARAM;

pBindings[lCount].cbMaxLen = 48;
pBindings[lCount].dwFlags = 0;

pBindings[lCount].wType = DBTYPE_WSTR;
pBindings[lCount].bPrecision = pDBColumnInfo[lCount].bPrecision;
pBindings[lCount].bScale = pDBColumnInfo[lCount].bScale;

// Compute the next buffer offset.
ConsumerBufColOffset += 48; //pDBColumnInfo[lCount].ulColumnSize;
};



hr = pIRowset->QueryInterface(IID_IAccessor,

(void **)&pIAccessor);



if(FAILED(hr))
{

goto CleanExit;
}

pIAccessor->CreateAccessor(DBACCESSOR_ROWDATA,
lNumCols,
pBindings,
0,
&hAccessor,
NULL);

// Get a set of 10 rows.
pIRowset->GetNextRows(NULL,

0,
10,
&lNumRowsRetrieved,
&pRows);

pBuffer = new BYTE[ConsumerBufColOffset];

// Display the rows.
while(lNumRowsRetrieved > 0)
{
for(lCount=0; lCount<lNumRowsRetrieved; lCount++)
{


memset(pBuffer, 0, ConsumerBufColOffset);
pIRowset->GetData(hRows[lCount], hAccessor, pBuffer);

// Insert item
// ID
temp = (LPTSTR)(LPCTSTR)&pBuffer[pBindings[0].obValue];
temp2 = StringToChar(temp);
strSimpleData[iTotalRows].iID = atoi(temp2);

// Walk through each columns...
for (lColumn=1; lColumn<lNumCols; lColumn++)
{

// Name
wcscpy(strSimpleData[iTotalRows].tcaName,(LPTSTR)(LPCTSTR)&pBuffer[pBindings[lColumn].obValue]);
}

// Update the total Row counter

iTotalRows++;

};
// Release the rows retrieved.
pIRowset->ReleaseRows(lNumRowsRetrieved,
hRows,
NULL,
NULL,
NULL);

// Get the next set of 10 rows.
pIRowset->GetNextRows(NULL,
0,
10,
&lNumRowsRetrieved,
&pRows);


}


*iDataCount = iTotalRows; // Return Total Data Count


CleanExit:

if (pStringsBuffer != NULL)
{
CoTaskMemFree(pStringsBuffer);
pStringsBuffer = NULL;
}
if (pBuffer != NULL)
{
CoTaskMemFree(pBuffer);
pBuffer = NULL;
}
if (pDBColumnInfo != NULL)
{
CoTaskMemFree(pDBColumnInfo);
pDBColumnInfo = NULL;
}
if (pBindings != NULL)
{
CoTaskMemFree(pBindings);
pBindings = NULL;
}


if (temp2 != NULL)
{
delete temp2;
temp2 = NULL;
}


if (pIColumnsInfo != NULL)
{
pIColumnsInfo->Release();
pIColumnsInfo = NULL;
}
if (pIAccessor != NULL)
{
pIAccessor->ReleaseAccessor(hAccessor,NULL);
pIAccessor->Release();
pIAccessor = NULL;
}
if (pIRowset != NULL)
{
pIRowset->Release();
pIRowset = NULL;
}
if (pIDBCrtCmd != NULL)
{
pIDBCrtCmd->Release();
pIDBCrtCmd = NULL;
}
if (pICmdText != NULL)
{
pICmdText->Release();
pICmdText = NULL;
}

DisconnectDB();

if(FAILED(hr))
{
return ERROR;
}

return OK;


}




...
...
...

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