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Managing Multiuser Databases

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.

False
True

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Managing Multiuser Databases
Locks placed by the DBMS are called ________ .

implicit locks
exclusive locks
shared locks
explicit locks

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Managing Multiuser Databases
Database administration refers to a function that applies to the entire organization.

True
False

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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

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Managing Multiuser Databases
When two transactions are being processed against the database at the same time they are termed concurrent transactions.

False
True

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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?

Phantom read
Consistent read
Dirty read
Nonrepeatable read

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