X lock and U lock
An X lock is an exclusive lock, and when a process holds an X-lock on a resource, no other process can access it.A U lock is a shared lock, meaning that other processes who also want a shared lock on...
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Onhttp://www.sqlteam.com/article/introduction-to-locking-in-sql-server it says(U) lock"When a DML statement is executed SQL Server has to find the data it wants to modify first, so to avoid lock...
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