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? Dirty read Nonrepeatable read Phantom read Consistent read Dirty read Nonrepeatable read Phantom read Consistent read 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 Which of the following locks the item from change but not from read? Explicit lock Exclusive lock Shared lock Implicit lock Explicit lock Exclusive lock Shared lock Implicit lock 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? Phantom read Nonrepeatable read Dirty read Consistent read Phantom read Nonrepeatable read Dirty read Consistent read ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases In this instance, dirty reads are disallowed, while nonrepeatable reads and phantom reads are allowed. Repeatable read Serializable Read uncommitted Read committed Repeatable read Serializable Read uncommitted Read committed ANSWER DOWNLOAD EXAMIANS APP
Managing Multiuser Databases What is the overall responsibility of the DBA? 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 Create and populate tables Facilitate the development and use of the database Both the first and third answers above are correct. ANSWER DOWNLOAD EXAMIANS APP
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