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What is a Blocking in SQL Server | Find blocking and troubleshooting steps | SQL Interview Q&A
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Blocking is completely normal in SQL Server. You will typically be unaware of the many short blocks happening all the time.
Sometimes, blocks take longer than expected to resolve. Blocks of longer duration can create chains, where a blocked process blocks additional processes and so on. This type of blocking scenario is problematic.
The concern is not with blocking, but rather excessive blocking.
Video links below.
*What is Locking in SQL Server
*Locking Resources in SQL Server
*Locking modes in SQL Server
*Microsoft Documentation on Blocking
*sp_Whoisactive documentation link(to download stored procedure)
--T-SQL scripts used in this video
**UPDATE in spid 52
begin tran
update table1
set Id = 6201
where Ext = 122
**in spid 54
select * from table1
select request_session_id, request_mode, request_type,
resource_type, resource_description
select session_id, wait_duration_ms, wait_type,
blocking_session_id, resource_description
select session_id, status, wait_time, wait_type, wait_resource, command
sp_whoisactive @get_locks = 1
dbcc inputbuffer(52)
sp_who2 active
kill 52
EXEC sp_configure 'show advanced options', 1;
RECONFIGURE;
EXEC sp_configure 'blocked process threshold', 5
RECONFIGURE;
Sometimes, blocks take longer than expected to resolve. Blocks of longer duration can create chains, where a blocked process blocks additional processes and so on. This type of blocking scenario is problematic.
The concern is not with blocking, but rather excessive blocking.
Video links below.
*What is Locking in SQL Server
*Locking Resources in SQL Server
*Locking modes in SQL Server
*Microsoft Documentation on Blocking
*sp_Whoisactive documentation link(to download stored procedure)
--T-SQL scripts used in this video
**UPDATE in spid 52
begin tran
update table1
set Id = 6201
where Ext = 122
**in spid 54
select * from table1
select request_session_id, request_mode, request_type,
resource_type, resource_description
select session_id, wait_duration_ms, wait_type,
blocking_session_id, resource_description
select session_id, status, wait_time, wait_type, wait_resource, command
sp_whoisactive @get_locks = 1
dbcc inputbuffer(52)
sp_who2 active
kill 52
EXEC sp_configure 'show advanced options', 1;
RECONFIGURE;
EXEC sp_configure 'blocked process threshold', 5
RECONFIGURE;
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