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Managing Multiuser Databases

Managing Multiuser Databases
Locks placed by command are implicit locks.

False
True

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Managing Multiuser Databases
Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.

True
False

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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?

Dirty read
Consistent read
Nonrepeatable read
Phantom read

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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.

False
True

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Managing Multiuser Databases
Resource locking is a process to prevent multiple applications from obtaining copies of the same record when the record is about to be changed.

False
True

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Managing Multiuser Databases
A point of synchronization between the database and the transaction log is generally referred to as a stop point.

True
False

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