VC6.0连接SQL2000 出现Timeout expired错误？

[w20011025]

VC6.0连接SQL2000 出现Timeout expired错误？
每5秒插入130K数据，当数据库达到4GB的时候。
每过一天就出现 Timeout expired错误？
谢谢。

	//strSQL.Format(_T("select RecordDate,Channel,TempValue from History_Record"));
	//////////////////////////////////////////////////////////////////////////
	/**/
	CoInitialize(NULL);
	_ConnectionPtr m_pConnection;
	_RecordsetPtr m_pRecordset;
	try
	{
		m_pConnection.CreateInstance("ADODB.Connection");
		//////////////////////////
		m_pConnection->CommandTimeout=60*60*24;
		m_pConnection->ConnectionTimeout=60*60*24;
		//////////////////////////
		CString strConnect="Provider=SQLOLEDB.1;Password=; \
			Persist Security Info=True;User ID=sa;Initial Catalog=ampacityData";
		m_pConnection->Open((_bstr_t)strConnect,"","",adModeUnknown);
	}
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
	}
	try
	{
		m_pRecordset.CreateInstance(__uuidof(Recordset));// picture
		m_pRecordset->Open("select * from History_Record",m_pConnection.GetInterfacePtr(),
		adOpenDynamic,adLockOptimistic,adCmdText);
	}
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
		return;
	}
	VARIANT	 m_bitdata;
	VariantInit(&m_bitdata); 
	try
	{
		m_pRecordset->AddNew();//Ìí¼ÓÐÂÐÐ
	
		m_bitdata.vt = VT_ARRAY|VT_UI1;
		SAFEARRAY * m_psafe;
		SAFEARRAYBOUND m_band;
		m_band.cElements = DataLen;
		m_band.lLbound = 0;
		m_psafe = SafeArrayCreate(VT_UI1,1,&m_band);
		for(long i=0; i < (long)DataLen ; i++)
		{
			SafeArrayPutElement(m_psafe,&i,pByte++);//m_bitbuffer
		}	
		m_bitdata.parray = m_psafe;
		CString strChannel;
		strChannel.Format("%d",Channel);
		m_pRecordset->GetFields()->GetItem("RecordDate")->Value = (_bstr_t)str;
		m_pRecordset->GetFields()->GetItem("Channel")->Value = (_bstr_t)strChannel;
		m_pRecordset->GetFields()->GetItem("TempValue")->AppendChunk(&m_bitdata);
		///////////////////////////*************************
	//	SafeArrayDestroy(m_psafe); 
		VariantClear(&m_bitdata
		VariantInit(&m_bitdata); 	
		/////}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
		m_pRecordset->Update();

		m_pRecordset->Close();
		m_pConnection->Close();
		m_pRecordset.Release();
		m_pConnection.Release();
		CoUninitialize();
	}
	catch(_com_error e)
	{
		///////////////2010.09.11
		if (!(&m_bitdata))
		{
			VariantClear(&m_bitdata);//
			VariantInit(&m_bitdata); 
		}
		m_pRecordset->Close();
		m_pConnection->Close();
		m_pRecordset.Release();
		m_pConnection.Release();
		CoUninitialize();
		////////////////}}}}}}}}}}}
		AfxMessageBox(e.Description());
		return;
	}