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Differentiate strict two phase locking protocol and rigorous two phase locking protocol.
In strict two phase locking protocol all exclusive mode locks taken by a transaction is held unless that transaction commits.
Rigorous two phase locking protocol needs that all locks be held until the transaction commits.
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Attribute Preservation This is a easy and obvious necessity that includes preserving all the attributes that were there in the relation that is being decomposed.
limitations and benefits in database tecknowlagy
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