Managing Multiuser Databases The lost update problem is when User A reads data that have been processed by a portion of a transaction from User B. True False True False 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? Consistent read Nonrepeatable read Dirty read Phantom read Consistent read Nonrepeatable read Dirty read Phantom read 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. False True False True ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases What is the overall responsibility of the DBA? Create and populate tables Facilitate the development and use of the database Both the first and third answers above are correct. Development, operation, and maintenance of the database and its applications Create and populate tables Facilitate the development and use of the database Both the first and third answers above are correct. Development, operation, and maintenance of the database and its applications ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases A durable transaction is one in which all committed changes are permanent. False True False True ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases In optimistic locking, the assumption is made that conflict will occur. True False True False ANSWER DOWNLOAD EXAMIANS APP
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