Which requires a lock on the parent to get a lock on a node, Basic Computer Science

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Which requires a lock on the parent to get a lock on a node

Suppose we use the tree protocol with shared and exclusive locks for reading and writing, respectively. Rule (2), which requires a lock on the parent to get a lock on a node, must be changed to prevent unserializable behavior. What is the proper rule (2) for shared and exclusive locks?

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Basic Computer Science: Which requires a lock on the parent to get a lock on a node

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Basic Computer Science: Which requires a lock on the parent to get a lock on a node

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