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BCNF Boyce-Codd Normal Form
A relation schema R is in BCNF if it is in 3NF and accepts an additional constraint that for every FD X A, X has to be a candidate key. If a relational process is in BCNF then all redundancy based on functional dependency has been replaced, although other kinds of redundancy can still exist. A relational schema R is in Boyce-Codd normal form if and only if for each one of its dependencies X → Y.
Rearrange the Execution Order for Efficiency Rearranging execution order for efficiency means executing such job that requires less execution time. By rearranging the object
write on the various type of relationalkey
What are composite objects? Objects that have other objects are known as complex objects or composite objects.
Define Direct file organization? The direct file organization is employed to enhance the performance in accessing the records than sequential file organization. In direct file
What is RDBMS terminology for a row? A tuple is a RDBMS terminology for a row
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
what is inverted and multilist structure
what is query processing?
1. Design the logic, using a looping structure, for a program that outputs every even number from 1 through 25 along with its square and cube. 2. Mr. Sanchez owns 12 apartme
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:
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