Managing Multiuser Databases Locks placed by command are called ________ . explicit locks implicit locks exclusive locks shared locks explicit locks implicit locks exclusive locks shared locks ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases A transaction is a series of actions to be taken on the database so that either all of them are performed successfully or none of them are performed at all. False True False True ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases In optimistic locking, the assumption is made that conflict will occur. False True False True ANSWER DOWNLOAD EXAMIANS APP
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 A transaction in which either all of the database actions occur or none of them do is called: durable. consistent. isolated. atomic. durable. consistent. isolated. atomic. ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases Which of the following occurs when one transaction reads a changed record that has not been committed to the database? Consistent read Phantom read Nonrepeatable read Dirty read Consistent read Phantom read Nonrepeatable read Dirty read ANSWER DOWNLOAD EXAMIANS APP
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