Managing Multiuser Databases The advantage of optimistic locking is that: the lock never needs to be obtained. the lock is obtained before the transaction has processed. transactions that are best suited are those with a lot of activity. the lock is obtained only after the transaction has processed. the lock never needs to be obtained. the lock is obtained before the transaction has processed. transactions that are best suited are those with a lot of activity. the lock is obtained only after the transaction has processed. ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases The size of the lock is referred to as the lock granularity. True False True False ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases The transaction log contains a copy of every database record (or page) after it has changed. These records are called before images. True False True False ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Locks placed by the DBMS are called ________ . explicit locks exclusive locks shared locks implicit locks explicit locks exclusive locks shared locks implicit locks ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Database administration refers to a function that applies to the entire organization. True False True False ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Resource locking is a process to prevent multiple applications from obtaining copies of the same record when the record is about to be changed. True False True False ANSWER DOWNLOAD EXAMIANS APP
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