Although the SIX mode is beneficial in multiple-granularity locking, the exclusive and intention-shared (XIS) mode is completely ineffective. What makes it ineffective?

Database System Concepts
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Although the SIX mode is beneficial in multiple-granularity locking, the exclusive and intention-shared (XIS) mode is completely ineffective. What makes it ineffective?

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