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Explain hash file organization?
Hash functions
a) The distribution is uniform
Hash functions assign each bucket the similar number of search -key values from the set of all possible search-key values
b) The distributed in random
In the average case every bucket will have nearly same no of values assigned to it, regardless of the actual distribution of search-key values
Handling of bucket overflows
o Insufficient buckets
o Skew
Open hashing
Under an alternative approach known as open hashing
Close hashing
The form of hash structure that we have just explained is something referred to as close hashing.
Hash indices
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Describe the difference between a one-to-many and a many-to-many relationship. Which logical data structures comprise one-to-many and which comprise many-to-many relationship?
What are the three types of data sources used with ODBC? An ODBC file data source is a file that can be shared between database users. An ODBC system data source is one that is
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If R1 and R2 are two union compatible relations or functions, then the result of R3 = R1 ∩R2 is the relation that contains all tuples that are in both the relations In other words,
A set of possible data values is called? A set of possible data values is called as domain.
Australian Bureau of Statistics (ABS) provides retail data for different groups and different states as well as the aggregate numbers. Table 11 " Retail Turnover, State by Industry
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