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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.
How does the system cope up with a record crash when recovery is going on after the first crash? Ans: In a system the undo and redo operations are needed to be idempotent to c
Differentiate between horizontal & mixed horizontal fragmentation?
Define Query Processing Query processing is the process of selecting the best plan or strategy to be employed in responding to a database request. The plan is then executed to
What is it ?
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 & dependency preserving decomposition ?
What is a query tree? Ans: A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu
The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.
explain normalisation
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