CODEWITHSUNDEEP
sql-serverdatabasesql-server-2005connection
jagan
jagan

Reputation:

How to determine total number of open/active connections in ms sql server 2005

My PHP/MS Sql Server 2005/win 2003 Application occasionally becomes very unresponsive, the memory/cpu usage does not spike. If i try to open any new connection from sql management studio, then the it just hangs at the open connection dialog box. how to deterime the total number of active connections ms sql server 2005

Upvotes: 115

Views: 367057

Answers (9)

QuilleyPowers
QuilleyPowers

Reputation: 110

Glenn Barry's connections by IP (Query 39) are pretty helpful as well.

SELECT ec.client_net_address, es.[program_name], es.[host_name], es.login_name, 
COUNT(ec.session_id) AS [connection count] 
FROM sys.dm_exec_sessions AS es WITH (NOLOCK) 
INNER JOIN sys.dm_exec_connections AS ec WITH (NOLOCK) 
ON es.session_id = ec.session_id 
GROUP BY ec.client_net_address, es.[program_name], es.[host_name], es.login_name  
ORDER BY ec.client_net_address, es.[program_name] OPTION (RECOMPILE);

Upvotes: 0

FatemehEbrahimiNik
FatemehEbrahimiNik

Reputation: 613

SELECT
[DATABASE] = DB_NAME(DBID), 
OPNEDCONNECTIONS =COUNT(DBID),
[USER] =LOGINAME
FROM SYS.SYSPROCESSES
GROUP BY DBID, LOGINAME
ORDER BY DB_NAME(DBID), LOGINAME

Upvotes: 0

realstrategos
realstrategos

Reputation: 793

Use this to get an accurate count for each connection pool (assuming each user/host process uses the same connection string)

SELECT 
DB_NAME(dbid) as DBName, 
COUNT(dbid) as NumberOfConnections,
loginame as LoginName, hostname, hostprocess
FROM
sys.sysprocesses with (nolock)
WHERE 
dbid > 0
GROUP BY 
dbid, loginame, hostname, hostprocess

Upvotes: 8

sqldba.today
sqldba.today

Reputation: 51

I know this is old, but thought it would be a good idea to update. If an accurate count is needed, then column ECID should probably be filtered as well. A SPID with parallel threads can show up multiple times in sysprocesses and filtering ECID=0 will return the primary thread for each SPID.

SELECT 
    DB_NAME(dbid) as DBName, 
    COUNT(dbid) as NumberOfConnections,
    loginame as LoginName
FROM
    sys.sysprocesses with (nolock)
WHERE 
    dbid > 0
    and ecid=0
GROUP BY 
    dbid, loginame

Upvotes: 5

Tarun Harkinia
Tarun Harkinia

Reputation: 21

MS SQL knowledge based - How to know open SQL database connection(s) and occupied on which host.

Using below query you will find list database, Host name and total number of open connection count, based on that you will have idea, which host has occupied SQL connection. 

SELECT DB_NAME(dbid) as DBName, hostname ,COUNT(dbid) as NumberOfConnections
FROM sys.sysprocesses with (nolock) 
WHERE dbid > 0 
and len(hostname) > 0 
--and DB_NAME(dbid)='master' /* Open this line to filter Database by Name */
Group by DB_NAME(dbid),hostname
order by DBName

Upvotes: 0

Mitch Wheat
Mitch Wheat

Reputation: 300549

This shows the number of connections per each DB:

SELECT 
    DB_NAME(dbid) as DBName, 
    COUNT(dbid) as NumberOfConnections,
    loginame as LoginName
FROM
    sys.sysprocesses
WHERE 
    dbid > 0
GROUP BY 
    dbid, loginame

And this gives the total:

SELECT 
    COUNT(dbid) as TotalConnections
FROM
    sys.sysprocesses
WHERE 
    dbid > 0

If you need more detail, run:

sp_who2 'Active'

Note: The SQL Server account used needs the 'sysadmin' role (otherwise it will just show a single row and a count of 1 as the result)

Upvotes: 312

Mina Gabriel
Mina Gabriel

Reputation: 25080

see sp_who it gives you more details than just seeing the number of connections

in your case i would do something like this 

 DECLARE @temp TABLE(spid int , ecid int, status varchar(50),
                     loginname varchar(50),   
                     hostname varchar(50),
blk varchar(50), dbname varchar(50), cmd varchar(50), request_id int) 
INSERT INTO @temp  

EXEC sp_who

SELECT COUNT(*) FROM @temp WHERE dbname = 'DB NAME'

Upvotes: 0

jwalkerjr
jwalkerjr

Reputation: 1809

If your PHP app is holding open many SQL Server connections, then, as you may know, you have a problem with your app's database code. It should be releasing/disposing those connections after use and using connection pooling. Have a look here for a decent article on the topic...

http://www.c-sharpcorner.com/UploadFile/dsdaf/ConnPooling07262006093645AM/ConnPooling.aspx

Upvotes: 1

Mitch Wheat
Mitch Wheat

Reputation: 300549

As @jwalkerjr mentioned, you should be disposing of connections in code (if connection pooling is enabled, they are just returned to the connection pool). The prescribed way to do this is using the 'using' statement:

// Execute stored proc to read data from repository
using (SqlConnection conn = new SqlConnection(this.connectionString))
{
    using (SqlCommand cmd = conn.CreateCommand())
    {
        cmd.CommandText = "LoadFromRepository";
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@ID", fileID);

        conn.Open();
        using (SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
        {
            if (rdr.Read())
            {
                filename = SaveToFileSystem(rdr, folderfilepath);
            }
        }
    }
}

Upvotes: 7

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