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What is an Index? An index is a small table having only two columns. The first column has a copy of the primary or candidate key of a table and the second column having a set o
What is object containment? References among objects can be used to model dissimilar real-world concepts.
Multiple-mode locks : It offers two locks: exclusive locks and shared locks. But why do we require these two locks? There are a lot of transactions in the database system that neve
why are older data models are being replaced by new data models
Explain natural join? Natural Join - Similar as equi-join except in which the join attributes (having similar names) are not involved in the resulting relation. Only one sets
List the drawbacks of relational database system A) Repetition of data B) Inability to s certain information.
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
In which format database schema is written ? Data base schema is written in the DDL format.
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
Define Specialisation and generalization in brief? Specialisation / generalization: Generalization or Specialization represents the is a relationship set, an necessary element
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