In the previous post, I shared T-SQL script to generate a DeadLock situation in SQL Server Database.
In this post, I am sharing different scripts to detect a Deadlock in SQL Server.

1. Using SP_LOCK, you can find the WAIT status for blocking sessions:

SP_LOCK

2. Using sys.sysprocesses:

SELECT * FROM sys.sysprocesses 
WHERE blocked > 0

3. Using common DMV:

SELECT 	
	der.blocking_session_id AS BlockingSessionID
	,dest.text AS BlockingStatement
FROM sys.dm_exec_connections AS sdec
INNER JOIN sys.dm_exec_requests AS der
    ON sdec.session_id = der.blocking_session_id
INNER JOIN sys.dm_os_waiting_tasks AS dowt
    ON der.session_id = dowt.session_id
CROSS APPLY sys.dm_exec_sql_text(sdec.most_recent_sql_handle) AS dest

4. Using sys.dm_tran_locks:

SELECT 
	request_session_id AS SPID 
	,DB_NAME(resource_database_id) AS DatabaseName
	,resource_type AS LockedResource
	,request_mode AS LockType
FROM sys.dm_tran_locks

5. Enable required trace flags to log DeadLock related information in Tracefile:

DBCC TRACEON (1204, -1)
DBCC TRACEON (1222, -1)

6. Count total number of DeadLock:

SELECT cntr_value AS TotalNumberOfDeadLocks
FROM sys.dm_os_performance_counters
WHERE counter_name = 'Number of Deadlocks/sec'
   AND instance_name = '_Total'

7. Using Extended Events and below script to create Extended Event for monitoring the DeadLock:

CREATE EVENT SESSION [Deadlock_Monitor] ON SERVER 
ADD EVENT sqlos.scheduler_monitor_deadlock_ring_buffer_recorded,
ADD EVENT sqlserver.lock_deadlock,
ADD EVENT sqlserver.lock_deadlock_chain,
ADD EVENT sqlserver.xml_deadlock_report 
ADD TARGET package0.event_file(SET filename=N'C:\Temp\Deadlock_Monitor.xel')
WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=ON)
GO

You can also use SSMS to create Extended Events for DeadLock, and you can monitor the live status of the server.

8. Using SQL Server Profiler:
SQL Server Profiler has three different events to capture a deadlock.

1.Deadlock graph
2.Lock: Deadlock
3.Lock: Deadlock Chain

In this post, I am sharing a SQL Script to find all the list of Dynamic Management Views and Functions in SQL Server 2008.

The Dynamic Management Views and Functions are very important to monitor and troubleshoot different database activity.

Most of the DBA only aware about few DMV and DMF but using this script you can find all available DMV and DMF of your SQL Server.

Below is a script

SELECT 
      name
      ,type
      ,type_desc
FROM sys.system_objects
WHERE name LIKE 'dm[_]%'
ORDER BY name