Mention and explain the contention situations caused by locks?

Locks play a vital role in maintaining the concurrency in the DB2 environment. Below are the contention situation caused by Locks which can degrade the DB2 performance.

• Suspension: This situation is encountered by an application when it requests the lock that is already held by another application and cannot be shared. This suspended process temporarily stops running and resumes when all the processes that hold the conflicting lock release them.
• Timeout: This situation is encountered by an application process when it terminates because of a suspension that exceeds the preset level. DB2 then terminates the process, issues message and returns the error codes.
• Deadlock: This situation occurs when two or more application processes each hold locks on resources that others need and without which they cannot proceed.