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
This question is related to
sql-server
database
sql-server-2005
connection
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
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
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);
}
}
}
}
SELECT
[DATABASE] = DB_NAME(DBID),
OPNEDCONNECTIONS =COUNT(DBID),
[USER] =LOGINAME
FROM SYS.SYSPROCESSES
GROUP BY DBID, LOGINAME
ORDER BY DB_NAME(DBID), LOGINAME
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
SELECT
[DATABASE] = DB_NAME(DBID),
OPNEDCONNECTIONS =COUNT(DBID),
[USER] =LOGINAME
FROM SYS.SYSPROCESSES
GROUP BY DBID, LOGINAME
ORDER BY DB_NAME(DBID), LOGINAME
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'
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
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);
}
}
}
}
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
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
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
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
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);
}
}
}
}
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
Source: Stackoverflow.com