Sql Server 2005 Connection Limit - sql-server

Question

Is there a connection limit on Sql Server 2005 Developers Edition. We have many threads grabbing connections, and I know ADO.NET does connection pooling, but I get OutOfMemory exceptions. We take out the db connections and it works fine.

Answer 1

This is the response to that question on Euan Garden's (a Program Manager for Visual Studio Team Edition) blog:
There are no limits in terms of memory, db size or procs for DE, it is essentially Enterprise Edition.
There is however a licensing restriction that prevents it from being used in production.
Therefore, you probably just need to make sure you are closing your connection objects properly. The using block will be perfect for such a job...

Answer 2

You may not be closing or disposing of your connection objects correctly. Make sure your code looks something like this:
using (SqlConnection conn = new SqlConnection("connectionstring"))
{
conn.Open();
// database access code goes here
}
The using block will automatically close and dispose of your connection object.

Answer 3

32767 on Enterprise Edition
<ServerProductVersion>9.00.3235.00</ServerProductVersion>
<ServerProductLevel>SP2</ServerProductLevel>
<ServerEdition>Enterprise Edition</ServerEdition>
<ServerEngineEdition>3</ServerEngineEdition>
How I check...
CREATE FUNCTION [dbo].svfV1GetSessionAndServerEnvironmentMetaData
RETURNS xml
AS
BEGIN
-- Declare the return variable here
DECLARE #ResultVar xml
-- Add the T-SQL statements to compute the return value here
SET #ResultVar =
(
SELECT
##SPID as SPID,
##ProcID as ProcId,
##DBTS as DBTS,
getdate() as DateTimeStamp,
System_User as SystemUser,
Current_User as CurrentUser,
Session_User as SessionUser,
User_Name() as UserName,
Permissions() as UserSessionPermissionsBitmap,
Host_Id() as HostId,
Host_Name() as HostName,
App_Name() as AppName,
ServerProperty('ProcessId') as ServerProcessId,
ServerProperty('MachineName') as ServerMachineName,
ServerProperty('ServerName') as ServerServerName,
ServerProperty('ComputerNamePhysicalNetBIOS') as ServerComputerNamePhysicalNetBIOS,
ServerProperty('InstanceName') as ServerInstanceName,
ServerProperty('ProductVersion') as ServerProductVersion,
ServerProperty('ProductLevel') as ServerProductLevel,
##CONNECTIONS as CumulativeSqlConnectionsSinceStartup,
##TOTAL_ERRORS as CumulativeDiskWriteErrorsSinceStartup,
##PACKET_ERRORS as CumulativeNetworkPacketErrorsSinceStartup,
--Note:
--If the time returned in ##CPU_BUSY, or ##IO_BUSY exceeds approximately 49 days of cumulative CPU time,
--you receive an arithmetic overflow warning. In that case,
--the value of ##CPU_BUSY, ##IO_BUSY and ##IDLE variables are not accurate.
-- ##CPU_BUSY * ##TIMETICKS as CumulativeMicroSecondsServerCpuBusyTimeSinceStartup,
-- ##IO_BUSY * ##TIMETICKS as CumulativeMicroSecondsServerIoBusyTimeSinceStartup,
-- ##IDLE * ##TIMETICKS as CumulativeMicroSecondsServerIdleTimeSinceStartup,
ServerProperty('BuildClrVersion') as ServerBuildClrVersion,
ServerProperty('Collation') as ServerCollation,
ServerProperty('CollationID') as ServerCollationId,
ServerProperty('ComparisonStyle') as ServerComparisonStyle,
ServerProperty('Edition') as ServerEdition,
ServerProperty('EditionID') as ServerEditionID,
ServerProperty('EngineEdition') as ServerEngineEdition,
ServerProperty('IsClustered') as ServerIsClustered,
ServerProperty('IsFullTextInstalled') as ServerIsFullTextInstalled,
ServerProperty('IsIntegratedSecurityOnly') as ServerIsIntegratedSecurityOnly,
ServerProperty('IsSingleUser') as ServerIsSingleUser,
ServerProperty('LCID') as ServerLCID,
ServerProperty('LicenseType') as ServerLicenseType,
ServerProperty('NumLicenses') as ServerNumLicenses,
ServerProperty('ResourceLastUpdateDateTime') as ServerResourceLastUpdateDateTime,
ServerProperty('ResourceVersion') as ServerResourceVersion,
ServerProperty('SqlCharSet') as ServerSqlCharSet,
ServerProperty('SqlCharSetName') as ServerSqlCharSetName,
ServerProperty('SqlSortOrder') as ServerSqlSortOrder,
ServerProperty('SqlSortOrderName') as ServerSqlSortOrderName,
##MAX_CONNECTIONS as MaxAllowedConcurrentSqlConnections,
SessionProperty('ANSI_NULLS') as SessionANSI_NULLS,
SessionProperty('ANSI_PADDING') as SessionANSI_PADDING,
SessionProperty('ANSI_WARNINGS') as SessionANSI_WARNINGS,
SessionProperty('ARITHABORT') as SessionARITHABORT,
SessionProperty('CONCAT_NULL_YIELDS_NULL') as SessionCONCAT_NULL_YIELDS_NULL,
SessionProperty('NUMERIC_ROUNDABORT') as SessionNUMERIC_ROUNDABORT,
SessionProperty('QUOTED_IDENTIFIER') as SessionQUOTED_IDENTIFIER
FOR XML PATH('SequenceIdEnvironment')
)
-- Return the result of the function
RETURN #ResultVar
END
on my SQL Server database engine instance returns
<SequenceIdEnvironment>
<SPID>56</SPID>
<ProcId>1666821000</ProcId>
<DBTS>AAAAAAAAB9A=</DBTS>
<DateTimeStamp>2008-10-02T15:09:26.560</DateTimeStamp>
...
<CurrentUser>dbo</CurrentUser>
<SessionUser>dbo</SessionUser>
<UserName>dbo</UserName>
<UserSessionPermissionsBitmap>67044350</UserSessionPermissionsBitmap>
<HostId>3852 </HostId>
...
<AppName>Microsoft SQL Server Management Studio - Query</AppName>
<ServerProcessId>508</ServerProcessId>
...
<ServerProductVersion>9.00.3235.00</ServerProductVersion>
<ServerProductLevel>SP2</ServerProductLevel>
<CumulativeSqlConnectionsSinceStartup>169394</CumulativeSqlConnectionsSinceStartup>
<CumulativeDiskWriteErrorsSinceStartup>0</CumulativeDiskWriteErrorsSinceStartup>
<CumulativeNetworkPacketErrorsSinceStartup>0</CumulativeNetworkPacketErrorsSinceStartup>
<ServerBuildClrVersion>v2.0.50727</ServerBuildClrVersion>
<ServerCollation>SQL_Latin1_General_CP1_CI_AS</ServerCollation>
<ServerCollationId>872468488</ServerCollationId>
<ServerComparisonStyle>196609</ServerComparisonStyle>
<ServerEdition>Enterprise Edition</ServerEdition>
...
<ServerEngineEdition>3</ServerEngineEdition>
<ServerIsClustered>0</ServerIsClustered>
<ServerIsFullTextInstalled>1</ServerIsFullTextInstalled>
<ServerIsIntegratedSecurityOnly>0</ServerIsIntegratedSecurityOnly>
<ServerIsSingleUser>0</ServerIsSingleUser>
...
<ServerResourceLastUpdateDateTime>2008-03-12T18:59:08.633</ServerResourceLastUpdateDateTime>
<ServerResourceVersion>9.00.3235</ServerResourceVersion>
<ServerSqlCharSet>1</ServerSqlCharSet>
<ServerSqlCharSetName>iso_1</ServerSqlCharSetName>
<ServerSqlSortOrder>52</ServerSqlSortOrder>
<ServerSqlSortOrderName>nocase_iso</ServerSqlSortOrderName>
** <MaxAllowedConcurrentSqlConnections>32767</MaxAllowedConcurrentSqlConnections> **
<SessionANSI_NULLS>1</SessionANSI_NULLS>
<SessionANSI_PADDING>1</SessionANSI_PADDING>
<SessionANSI_WARNINGS>1</SessionANSI_WARNINGS>
<SessionARITHABORT>1</SessionARITHABORT>
<SessionCONCAT_NULL_YIELDS_NULL>1</SessionCONCAT_NULL_YIELDS_NULL>
<SessionNUMERIC_ROUNDABORT>0</SessionNUMERIC_ROUNDABORT>
<SessionQUOTED_IDENTIFIER>1</SessionQUOTED_IDENTIFIER>
</SequenceIdEnvironment>

Answer 4

Are the out of memory exceptions from the .NET? If the error was on the server you would probably see a connection refused message instead.