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In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
Which are the two ways in which entities can participate in a relationship? Total and partial are the two ways in which entities can participate in a relationship
What are object interaction diagrams? Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation,
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Explain in detail about Collaboration Diagrams Collaboration diagrams are interaction diagrams which emphasize structural organisation of an object that transmit and receive m
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
what is Lossless-join decomposition
Optimistic Concurrency Control Is locking the only way to stop concurrency related problems? There exist some other ways too. One such way is known as an Optimistic Concurrency
Although how will the system recover The selection of REDO or UNDO for a transaction for the recovery is completed on the basis of the state of the transactions. This state is
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