Labels

Detailed Blocking Information With Query Information In SQL Server


                         
The servers which are extensively suffered from blocking are normal. To find detail info about blocking, You can use below query.

/************************************/
SELECT
owt.session_id AS waiting_session_id,
owt.blocking_session_id,
DB_NAME(tls.resource_database_id) AS database_name,
(SELECT SUBSTRING(est.[text], ers.statement_start_offset/2 + 1,
(CASE WHEN ers.statement_end_offset = -1
THEN LEN(CONVERT(nvarchar(max), est.[text])) * 2
ELSE ers.statement_end_offset
END
- ers.statement_start_offset
) / 2)
FROM sys.dm_exec_sql_text(ers.[sql_handle]) AS est) AS waiting_query_text,
CASE WHEN owt.blocking_session_id > 0
THEN (
SELECT
est.[text] FROM sys.sysprocesses AS sp
CROSS APPLY sys.dm_exec_sql_text(sp.[sql_handle]) as est
WHERE sp.spid = owt.blocking_session_id)
ELSE
NULL
END AS blocking_query_text,
(CASE tls.resource_type
WHEN 'OBJECT' THEN OBJECT_NAME(tls.resource_associated_entity_id, tls.resource_database_id)
WHEN 'DATABASE' THEN DB_NAME(tls.resource_database_id)
ELSE (SELECT OBJECT_NAME(pat.[object_id], tls.resource_database_id)
FROM sys.partitions pat WHERE pat.hobt_id = tls.resource_associated_entity_id)
END
) AS object_name,
owt.wait_duration_ms,
owt.waiting_task_address,
owt.wait_type,
tls.resource_associated_entity_id,
tls.resource_description AS local_resource_description,
tls.resource_type,
tls.request_mode,
tls.request_type,
tls.request_session_id,
owt.resource_description AS blocking_resource_description,
qp.query_plan AS waiting_query_plan
FROM sys.dm_tran_locks AS tls
INNER JOIN sys.dm_os_waiting_tasks owt ON tls.lock_owner_address = owt.resource_address
INNER JOIN sys.dm_exec_requests ers ON tls.request_request_id = ers.request_id AND owt.session_id = ers.session_id
OUTER APPLY sys.dm_exec_query_plan(ers.[plan_handle]) AS qp
GO

No comments:
Write comments

Please do not enter spam links

Services

More Services