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"Concurrency" is achieved by the DBMS when all transactions run successfully.
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A deadlock in a database occurs when two or more transactions are each waiting for the other to release a lock.
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Unrepeatable Reads is a type of concurrency issue.
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Distributed database systems are typically more resilient to node failure compared to centralized systems
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Sorting the output index aids in eliminating duplicates
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In distributed recovery, errors in communication connections do not pose new challenges, as the recovery process remains largely unaffected by network issues
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SORT MERGE JOIN cannot be optimized
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If the GROUP BY attributes are a prefix of the index key, tuples are found sorted by the prefix
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In multilevel databases, users with security levels S and TS can only see tuples of class S
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Two transactions are in conflict if they work on the same data objects.
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