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Views in relational algebra: 1. Basic expression contains either a) A relation in the database. b) A constant relation. 2. General expressions are madde out of sma
What are the purpose for having variable length records? What kinds of separator characters are required for each? Variable-Length Records - Variable-length records are thos
how to solve the C type problems?
Failures and Recovery In practice various things might occur to prevent a transaction from completing. Recovery methods are used to bring database, which does not satisfy consi
Differance between Unordered and ordered file ? Unordered file do no has any sequence although ordered file has arranged in a few sequence and data are assigned in ordered form
example of bank
What is known as fudge factor? The number of partitions is enhanced by a small value called the fudge factor, which is usually 20 percent of the number of hash partitions compu
What is association? Give an example of association Association is used for establishing relationships among classes. Association describe links among/between classes. For exa
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
In E-R Diagram how relationship type is represented ? In E-R Diagram relationship type is represented as a Diamond.
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