![]() ![]() 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. When we debugged SQL Server traces we discovered that row-level lock was escalated to table lock. SQL Server: Fix: Transaction (Process ID) was deadlocked on lock communication buffer resources with another process and has been chosen as the deadlock victim. ls resources with another process and has been chosen as the deadlock victim. While the file was being uploaded user navigated to another page where data from the same table was queried. Although you can set deadlock priority for each transaction by using SET DEADLOCKPRIORITY option, one of them will be killed and you will get this error 1205: 'Transaction (Process ID d) was deadlocked on. ![]() The database deadlock was caused when user uploads a file that was being written to the database. 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. What is blocking Blocking is an unavoidable and by-design characteristic of any relational database management system (RDBMS) with lock-based concurrency. ![]()
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