The multiple-granularity protocol rules specify that a transaction Ti can lock a node Q in S or
Question:
The multiple-granularity protocol rules specify that a transaction Ti can lock a node Q in S or IS mode only if Ti currently has the parent of Q locked in either IX or IS mode. Given that SIX and S locks are stronger than IX or IS locks, why does the protocol not allow locking a node in S or IS mode if the parent is locked in either SIX or S mode?
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The multiplegranularity protocol is designed to allow transactions to lo...View the full answer
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Related Book For 
Database System Concepts
ISBN: 9780078022159
7th Edition
Authors: Abraham Silberschatz, Henry F. Korth, S. Sudarshan
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