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Explain Two phase locking protocol
A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the transaction. Such type of transaction can be divided into two phases: and expanding or growing (first) phase, throughout which new locks on items can be acquired but none can be released; and a shrinking (second) phase, throughout which existing locks can be released but no new locks can be obtained. This two-phase protocol can make sure the serializability because all the data items needed by a transaction will be locked at the starting of the transaction and if other transaction needs to use those data items then it has to wait till they become unlocked.
Control Files : The redo and control files logs support the rest of the architecture. Every database must have at least one control file, although you have more than one to guard
Performance of Various Concurrency Control Mechanisms
The data of a view is not physically stored, but derived from one or more tables. True the data of a view is not physically stored
#question benefits and limitations of data models..
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Creating views with Read only option : In the view definition this option is used to make sure that no DML operations can be done on the view.
explain in detail about time stamp orderting/
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