Please run the query which is showing the Host IP , BlockingSessionId, BlockingUser, BlockingSQL as a text , WhyBlocked, BlockedSQL and Database name. Blocking is an unavoidable characteristic of any relational database management system (RDBMS) with lock-based concurrency. This is normal behavior and may happen many times throughout the course of a day with no noticeable effect on system performance. The below query will help out to get the root cause why it is Blocked
SELECT client_net_address as HOSTIP,Blocking.session_id as BlockingSessionId , Sess.login_name AS BlockingUser , BlockingSQL.text AS BlockingSQL , Waits.wait_type WhyBlocked , Blocked.session_id AS BlockedSessionId , USER_NAME(Blocked.user_id) AS BlockedUser , BlockedSQL.text AS BlockedSQL , DB_NAME(Blocked.database_id) AS DatabaseName FROM sys.dm_exec_connections AS Blocking INNER JOIN sys.dm_exec_requests AS Blocked ON Blocking.session_id = Blocked.blocking_session_id INNER JOIN sys.dm_os_waiting_tasks AS Waits ON Blocked.session_id = Waits.session_id RIGHT OUTER JOIN sys.dm_exec_sessions Sess ON Blocking.session_id = sess.session_id CROSS APPLY sys.dm_exec_sql_text(Blocking.most_recent_sql_handle) AS BlockingSQL CROSS APPLY sys.dm_exec_sql_text(Blocked.sql_handle) AS BlockedSQL ORDER BY BlockingSessionId, BlockedSessionId
Systems with a large number of requests on a critical database table are prone to blocking and slowness. We take a look at getting things done using T-SQL table hints.
2017-06-20
3,579 reads
Problems with blocking processes can be easy to identify with SQL Server DMV's.
2013-09-19
7,290 reads
This metric reports the number of connections that are currently blocked, divided by the total count of current connections.
Most well-balanced SQL Servers will have some degree of blocking. This metric attempts to measure the impact of lead blocking queries against other queries. Higher values indicate that many connections are being blocked, and queries should be tuned to reduce the amount of contention.
2013-06-07
3,144 reads
In this tip, Basit Farooq shares a query written using dynamic management views (DMVs) that will help you to quickly identify SPIDs and other useful information about the processes that are causing blocking on a SQL Server instance.
2013-05-01
6,231 reads
Monitoring blocking can be problematic when you cannot catch it in the act. This article will show you an easy way to configure a SQL Server Profiler Trace to monitor blocking
2011-05-19
12,099 reads
