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I, Rohit Garg, am working as Consultant in IT Company. I am having an around 5 years of experience in MSSQL server & other Microsoft technologies. I am working as DBA in Microsoft SQL Server from last 5 years in e-Commerce, Telecom, Finance domain. In this tenure, I got a chance of working as Database administrator, Developer and trainer on SQL server 2000 to SQL Server 2012. I am holding Master’s degree in Computer Science along with certification in SQL Server & .Net. I like to learn new things by hand-on experience on regular basis. This journey is so far is delightful & valuable with the addition of wonderful friends.

DMV-1 : Who All Are connected ? …. sys.dm_exec_connections

The sys.dm_exec_connections DMV (Dynamic Management View) is represented by Books Online (BOL) as follows : http://msdn.microsoft.com/en-us/library/ms181509.aspx

Returns information about the connections established to this instance of SQL Server and the details of each connection.

sys.dm_exec_connections is the most common DMV used to get connection details. We will get details info regarding every connection like protocol user, last read time, last write time, last executed SQL query, connection time etc.

Query 1 : Complete details of every SQL Connection

SELECT

C.SESSION_ID,

C.MOST_RECENT_SESSION_ID,

C.CONNECT_TIME,

C.LAST_READ,

C.LAST_WRITE,

C.NUM_READS,

C.NUM_WRITES,

C.NET_TRANSPORT,

C.ENCRYPT_OPTION,

C.AUTH_SCHEME,

C.PROTOCOL_TYPE,

C.PROTOCOL_VERSION,

C.NET_PACKET_SIZE,

C.ENDPOINT_ID,

C.CLIENT_NET_ADDRESS,

C.CLIENT_TCP_PORT,

C.LOCAL_NET_ADDRESS,

C.LOCAL_TCP_PORT,

C.NODE_AFFINITY,

C.CONNECTION_ID,

C.PARENT_CONNECTION_ID,

C.MOST_RECENT_SQL_HANDLE,

CASE WHEN ST.DBID = 32767 THEN ‘RESOURCEDB’ ELSE DB_NAME(ST.DBID) END AS DATABASE_NAME,

CASE WHEN ST.DBID IS NULL THEN NULL ELSE OBJECT_SCHEMA_NAME(ST.OBJECTID, ST.DBID) END AS OBJECT_SCHEMA_NAME,

CASE WHEN ST.DBID IS NULL THEN NULL ELSE OBJECT_NAME(ST.OBJECTID, ST.DBID) END AS OBJECT_NAME,

ST.TEXT AS QUERY_TEXT

FROM

SYS.DM_EXEC_CONNECTIONS C

CROSS APPLY SYS.DM_EXEC_SQL_TEXT(C.MOST_RECENT_SQL_HANDLE) ST

Query 2 : Sample Query Get a count of SQL connections by IP address

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

INNER JOIN SYS.DM_EXEC_CONNECTIONS AS EC

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] ;

Permissions : User required VIEW SERVER STATE permission on the server, to use this DMV.

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Reference : Rohit Garg (http://mssqlfun.com/)


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