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Explain the Static or conservative Two Phase Locking:
Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any operations on them and are released just only after the last operation carried out on any data item.
X(X)
X (Y)
Read (X)
Write (X)
Read (Y)
Y = Y+N
Write Y
Unlock (X)
Unlock (Y)
In static 2PL, requests from other transactions for data items locked by the previous transaction will be delayed without need, so causing a serious impact on system performance.
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
triggering
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Illustrate the State model for the ATM class let us take state model for the ATM class given below in Figure showing state model of the ATM class and the pseudo code derived fr
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define normalisation and functional dependency
How does Oracle act as ODBC and give examples of front end uses with ODBC? ODBC achieve portability at the level of the executable by introducing an extra level of indirection.
What is a shadow copy scheme? It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that singl
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Describe five main functions of a database administrator. Ans: A database administrator (DBA) is a person who is accountable for the environmental aspects of a database. Genera
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