Managing Multiuser Databases The advantage of optimistic locking is that: transactions that are best suited are those with a lot of activity. the lock is obtained before the transaction has processed. the lock never needs to be obtained. the lock is obtained only after the transaction has processed. transactions that are best suited are those with a lot of activity. the lock is obtained before the transaction has processed. the lock never needs to be obtained. the lock is obtained only after the transaction has processed. ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Which of the following occurs when a transaction rereads data and finds new rows that were inserted by a command transaction since the prior read? Consistent read Dirty read Phantom read Nonrepeatable read Consistent read Dirty read Phantom read Nonrepeatable read ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Locks placed by the DBMS are explicit locks. False True False True ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases The size of a lock is called: implicit lock shared lock exclusive lock lock granularity implicit lock shared lock exclusive lock lock granularity ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Which of the following occurs when a transaction rereads data it has previously read and finds modification or deletions caused by a committed transaction? Phantom read Dirty read Nonrepeatable read Consistent read Phantom read Dirty read Nonrepeatable read Consistent read ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Dirty read, nonrepeatable, and phantom reads are not possible in this instance. Read committed Read uncommitted Repeatable read Serializable Read committed Read uncommitted Repeatable read Serializable ANSWER DOWNLOAD EXAMIANS APP
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