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Tuesday, December 13, 2011

System procedure "sp_who" Detail and Uses


Select sp_who: it returns all system connections with following information.



sp_who returns a result set with the following information.
Column
Data type
Description
spid
smallint
Session ID.
ecid
smallint
Execution context ID of a given thread associated with a specific session ID.
ECID = {0, 1, 2, 3, ...n}, where 0 always represents the main or parent thread, and {1, 2, 3, ...n} represent the subthreads.
status
nchar(30)
Process status. The possible values are:
dormant. SQL Server is resetting the session.
running. The session is running one or more batches. When Multiple Active Result Sets (MARS) is enabled, a session can run multiple batches. For more information, see Using Multiple Active Result Sets (MARS).
background. The session is running a background task, such as deadlock detection.
rollback. The session has a transaction rollback in process.
pending. The session is waiting for a worker thread to become available.
runnable. The session's task is in the runnable queue of a scheduler while waiting to get a time quantum.
spinloop. The session's task is waiting for a spinlock to become free.
suspended. The session is waiting for an event, such as I/O, to complete.
loginame
nchar(128)
Login name associated with the particular process.
hostname
nchar(128)
Host or computer name for each process.
blk
char(5)
Session ID for the blocking process, if one exists. Otherwise, this column is zero.
When a transaction associated with a specified session ID is blocked by an orphaned distributed transaction, this column will return a '-2' for the blocking orphaned transaction.
dbname
nchar(128)
Database used by the process.
cmd
nchar(16)
Database Engine command (Transact-SQL statement, internal Database Engine process, and so on) executing for the process.
request_id
int
ID for requests running in a specific session.
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