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Explain data dictonary on oracle ? Data Dictionary - Data dictionaries are the system tables in which contain descriptions of the database objects and how they are structured.
What are the disadvantages of relational data ? Disadvantages • Performance - If the number of tables among that relationships to be established are large and the tables t
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
Desirable Properties Of Decomposition Decomposition is a process of dividing a relation into its projections that will not be disjoint. Please remind the Relational projection
differences between a classified catalog and a dictionary catalog
What is object containment? References among objects can be used to model dissimilar real-world concepts.
why shadow copy technique is used?
How nulls are treated in comparison operator? Along with comparison (relational) operators, the null values are ignored as we cannot derive the relation along with the given op
A database administrator''s responsibilities and data contents
explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
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