A single client application may have one or more connections. Rather, each SPID consists of the server resources and data structures necessary to service the requests of a single connection from a given client. Each of these SPIDs is often referred to as a process, although it's not a separate process context in the usual sense. Each connection appears as a session ID (SPID) or session_id in many DMVs. In this article, the term connection refers to a single logged-on session of the database. The article describes blocking in SQL Server and demonstrates how to troubleshoot and resolve blocking. L2.Applies to: SQL Server (all supported versions), Azure SQL Managed Instance (l1.blocking_spid = l2.waiting_spid AND l1.waiting_spid = l2.blocking_spid AND l1.wait_duration_ms > l2.wait_duration_ms AND = != 'DEADLOCK' AND 1 = 1) If we remove it we will be processing "long held locks" which are not necessarily "dead". This join is the filter which actually checks there is some mutual locking. L2.wait_duration_ms AS wait_duration_ms_waiting L1.wait_duration_ms AS wait_duration_ms_blocking, Ĝursor to process dead-locked VARCHAR(MAX) = ''ĭECLARE sessions_cursor CURSOR FAST_FORWARD Wt.blocking_session_id = ws.blocking_spid AND L1.request_session_id != l2.request_session_id AND L1.resource_associated_entity_id = l2.resource_associated_entity_id AND L1.resource_database_id = l2.resource_database_id AND IF (ISNULL(OBJECT_ID('tempdb.dbo.#locked_sessions'), 0) != 0) VIEW SERVER STATE (for sp_lock and sys.dm_os_waiting_tasks) How long either process is waiting for the BIT: (show or show and kill the processes identified)Ġ (default) - only show processes that match = 0ĪLTER ANY CONNECTION (inherited via sysadmin or processadmin) It takes into account the parameter to check for 'DEADLOCK' - Not a real deadlock but 2 processes who are waiting for eachother. 'WAITING' - the process that is waiting until the blocker finishes 'BLOCKER' - the process that blocks another process Only used in combination with = VARCHAR(10): (identify what process to analyze)
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