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when are two sets of functional dependencies equivalent how can we determine their
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why can we not guarantee that bcnf relation schemas will be produced by dependency-preserving decompositions of
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suppose we want to create a linear hash file with a file load factor of 07 and a blocking factor of 20 records per
why is accessing a disk block expensive discuss the time components involved in accessing a disk
what are the reasons for having variable-length records what types of separator characters are needed for
what are the typical record-at-a-time operations for accessing a file which of these depend on the current file
discuss the advantages and disadvantages of using a an unordered file b an ordered file and c a static hash file with
discuss the techniques for allowing a hash file to expand and shrink dynamically what are the advantages and
consider a disk with the following characteristics these are not parameters of any particular disk unit block size b
a file has r 20000 student records of fixed length each record has the following fields name 30 bytes ssn 9 bytes
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