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What are stored and derived attributes?
Stored attributes: The attributes keeps in a data base are known as stored attributes.
Derived attributes: The attributes that are derived from the stored attributes are known as derived attributes.
define lock conversion
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
Differentiate between join and outer join? Outer joins return all rows from at least one of the tables or views mentioned within the FROM clause, as long as those rows get toge
job scheduling for different cubes
What is a recursive relationship? Give an example not used in the text. A recursive relationship is a relationship among an entity and itself. For example, given the entity PER
Lost Updates : Suppose the two transactions T3 and T4 run simultaneously and they happen to be interleaved in the following way (suppose the initial value of X as 10000):
What are the two types of errors? The two types of errors are: a) Logical error b) System error
Define null values. In some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for a certain entity. In the
Differentiate between horizontal & mixed horizontal fragmentation?
What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
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