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What a database lock is? What the query optimizer is and how it works to prevent locks? What multiple granularities is and how it is

What a database lock is? What the query optimizer is and how it works to prevent locks? What multiple granularities is and how it is related to locks.

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Database Lock A database lock is a mechanism used in database management systems DBMS to control concurrent access to shared resources like tables or ... blur-text-image

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