When the owning session releases the lock, the second connection is then free to acquire its own lock on the resource and continue processing. Typically, the time frame for which the first SPID locks the resource is small. Blocking in a database in Azure SQL Database occurs when one session holds a lock on a specific resource and a second SPID attempts to acquire a conflicting lock type on the same resource. Understand blockingīlocking is an unavoidable and by-design characteristic of any relational database management system (RDBMS) with lock-based concurrency. For more on blocking in SQL Server, see Understand and resolve SQL Server blocking problems. Azure SQL Database is based on the latest stable version of the Microsoft SQL Server database engine, so much of the content is similar though troubleshooting options and tools may differ. This content is focused on Azure SQL Database. One connection can block another connection, regardless of the source client.įor information on troubleshooting deadlocks, see Analyze and prevent deadlocks in Azure SQL Database. From the perspective of Azure SQL Database, there is no difference between multiple connections from a single client application on a single client computer and multiple connections from multiple client applications or multiple client computers they are atomic. 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 is 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 Azure SQL databases and demonstrates how to troubleshoot and resolve blocking.
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