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What is Lock Based Protocol and what is its use?
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Answer Posted / amit yadav
A lock is a mechanism to control concurrent access to a data
item
Data items can be locked in two modes :
1. exclusive (X) mode. Data item can be both read as well as
written. X-lock is requested using lock-X instruction.
2. shared (S) mode. Data item can only be read. S-lock is
requested using lock-S instruction.
Lock requests are made to concurrency-control manager.
Transaction can
proceed only after request is granted.
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