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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

Deadlocks

A deadlock occurs when two processes are each waiting for a locked resource that the other process currently holds. Neither process can move forward until it receives the requested lock on the resource, and neither process can release the lock it is currently holding until it can receive the requested lock. Essentially, neither process can move forward until the other one completes, and neither one can complete until it can move forward.

Two primary types of deadlocks can occur in SQL Server:

Cycle deadlocks—A cycle deadlock occurs when two processes acquire locks on different resources, and then each needs to acquire a lock on the resource that the other process has. Figure 37.11 demonstrates an example of a cycle deadlock.

Figure ...

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Publisher Resources

ISBN: 9780768696585Purchase book