Consider the following graph-based locking protocol, which allows only exclusive lock modes, and which operates on data
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Consider the following graph-based locking protocol, which allows only exclusive lock modes, and which operates on data graphs that are in the form of a rooted directed acyclic graph.
• A transaction can lock any vertex first.
• To lock any other vertex, the transaction must be holding a lock on the majority of the parents of that vertex. Show that the protocol ensures serializability and deadlock freedom.
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