![]() Since wee enabled READ_COMMITTED_SNAPSHOT SQL Server will use versioning instead of locks. The isolation level uses shared locking or row versioning to prevent dirty reads, depending on whether the READ_COMMITTED_SNAPSHOT database option is enabled. The default database isolation level in SQL Server is READ_COMMITTED which means a query in the current transaction cannot read data modified by another transaction that has not yet committed, thus preventing dirty reads. To solve this issue we enabled READ_COMMITTED_SNAPSHOT option for the database so that it uses READ_COMMITTED with row versioning isolation strategy. This was causing SQL Server to stop other transactions from accessing the table. Figure 1 shows the resulting Extended Events xmldeadlockreport event in the eventfile target of the systemhealth default event session. When we debugged SQL Server traces we discovered that row-level lock was escalated to table lock. While the file was being uploaded user navigated to another page where data from the same table was queried. The database deadlock was caused when user uploads a file that was being written to the database. There are no other connections to this database while the application is running. ![]() Exception is : could not execute query SQL nested exception is : could not execute query] with root causeĬom.: Transaction (Process ID 132) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Preventing deadlocks in SQL Server Ask Question Asked 6 years, 7 months ago Modified 1 year ago Viewed 47k times 7 I have an application connected to a SQL Server 2014 database that combines several rows into one. ![]()
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