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4. Describe three ways to handle missing field values
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
What is primary Key Explain? Primary Key - Primary key is one of the candidate keys. It should be selected such in which its attribute values are never, or very rarely, chang
What is persistency? Persistency ensures which data is stored and that after the object is no longer available (program stops running) the data will be available to other users
Design a gennalization and specialization hierarchy for an automobile sales company
WOUND-WAIT
Define the Immediate Update The immediate update methods may apply changes to the database on disk before the transaction arrives a successful conclusion. Though, these change
What are the advantages of object oriented databases in comparison with others? Why it is still not widely used? Object oriented designs are coherent, efficient and less prone
aggregation
Give the two reasons for allowing concurrency
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