sys.dm_exec_connections (Transact-SQL)

THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)yesAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse

Returns information about the connections established to this instance of SQL Server and the details of each connection. Returns server wide connection information for SQL Server. Returns current database connection information for SQL Database.

Note

To call this from Azure SQL Data Warehouse or Parallel Data Warehouse, use sys.dm_pdw_exec_connections (Transact-SQL).

Column name Data type Description
session_id int Identifies the session associated with this connection. Is nullable.
most_recent_session_id int Represents the session ID for the most recent request associated with this connection. (SOAP connections can be reused by another session.) Is nullable.
connect_time datetime Timestamp when connection was established. Is not nullable.
net_transport nvarchar(40) Always returns Session when a connection has multiple active result sets (MARS) enabled.

Note: Describes the physical transport protocol that is used by this connection. Is not nullable.
protocol_type nvarchar(40) Specifies the protocol type of the payload. It currently distinguishes between TDS (TSQL) and SOAP. Is nullable.
protocol_version int Version of the data access protocol associated with this connection. Is nullable.
endpoint_id int An identifier that describes what type of connection it is. This endpoint_id can be used to query the sys.endpoints view. Is nullable.
encrypt_option nvarchar(40) Boolean value to describe whether encryption is enabled for this connection. Is not nullable.
auth_scheme nvarchar(40) Specifies SQL Server/Windows Authentication scheme used with this connection. Is not nullable.
node_affinity smallint Identifies the memory node to which this connection has affinity. Is not nullable.
num_reads int Number of byte reads that have occurred over this connection. Is nullable.
num_writes int Number of byte writes that have occurred over this connection. Is nullable.
last_read datetime Timestamp when last read occurred over this connection. Is nullable.
last_write datetime Timestamp when last write occurred over this connection. Not Is nullable.
net_packet_size int Network packet size used for information and data transfer. Is nullable.
client_net_address varchar(48) Host address of the client connecting to this server. Is nullable.

Prior to V12 in Azure SQL Database, this column always returns NULL.
client_tcp_port int Port number on the client computer that is associated with this connection. Is nullable.

In Azure SQL Database, this column always returns NULL.
local_net_address varchar(48) Represents the IP address on the server that this connection targeted. Available only for connections using the TCP transport provider. Is nullable.

In Azure SQL Database, this column always returns NULL.
local_tcp_port int Represents the server TCP port that this connection targeted if it were a connection using the TCP transport. Is nullable.

In Azure SQL Database, this column always returns NULL.
connection_id uniqueidentifier Identifies each connection uniquely. Is not nullable.
parent_connection_id uniqueidentifier Identifies the primary connection that the MARS session is using. Is nullable.
most_recent_sql_handle varbinary(64) The SQL handle of the last request executed on this connection. The most_recent_sql_handle column is always in sync with the most_recent_session_id column. Is nullable.
pdw_node_id int Applies to: Azure SQL Data Warehouse, Parallel Data Warehouse

The identifier for the node that this distribution is on.

Permissions

On SQL Server, requires VIEW SERVER STATE permission.
On SQL Database Premium Tiers, requires the VIEW DATABASE STATE permission in the database. On SQL Database Standard and Basic Tiers, requires the Server admin or an Azure Active Directory admin account.

Physical Joins

Joins for sys.dm_exec_connections

Relationship Cardinalities

dm_exec_sessions.session_id dm_exec_connections.session_id One-to-one
dm_exec_requests.connection_id dm_exec_connections.connection_id Many to one
dm_broker_connections.connection_id dm_exec_connections.connection_id One to one

Examples

Typical query to gather information about a queries own connection.

SELECT   
    c.session_id, c.net_transport, c.encrypt_option,   
    c.auth_scheme, s.host_name, s.program_name,   
    s.client_interface_name, s.login_name, s.nt_domain,   
    s.nt_user_name, s.original_login_name, c.connect_time,   
    s.login_time   
FROM sys.dm_exec_connections AS c  
JOIN sys.dm_exec_sessions AS s  
    ON c.session_id = s.session_id  
WHERE c.session_id = @@SPID;  

See Also

Execution Related Dynamic Management Views and Functions (Transact-SQL)