Managing Multiuser Databases A phantom read occurs when a transaction rereads data it has previously read and finds modifications or deletions caused by a committed transaction. True False True False ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Which of the following locks the item from access of any type? Implicit lock Shared lock Exclusive lock Explicit lock Implicit lock Shared lock Exclusive lock Explicit lock ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases What is the overall responsibility of the DBA? Create and populate tables Both the first and third answers above are correct. Development, operation, and maintenance of the database and its applications Facilitate the development and use of the database Create and populate tables Both the first and third answers above are correct. Development, operation, and maintenance of the database and its applications Facilitate the development and use of the database ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Locks placed by command are implicit locks. True False True False ANSWER DOWNLOAD EXAMIANS APP
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 Locks placed by command are called ________ . implicit locks shared locks explicit locks exclusive locks implicit locks shared locks explicit locks exclusive locks ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS