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Managing Multiuser Databases

Managing Multiuser Databases
In optimistic locking, the assumption is made that conflict will occur.

False
True

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Managing Multiuser Databases
Locks placed by the DBMS are explicit locks.

False
True

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Managing Multiuser Databases
When one transaction reads a changed record that has not been committed to the database a filthy read occurs.

False
True

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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

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Managing Multiuser Databases
Which of the following locks the item from change but not from read?

Shared lock
Exclusive lock
Explicit lock
Implicit lock

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Managing Multiuser Databases
A transaction for which all committed changes are permanent is called:

consistent.
durable.
isolated.
atomic.

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