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In which relational modes, cardinality is termed?
Answer : Cardinality is termed in a number of tuples relational modes.
Describe the storage structure of indexed sequential files and their access method. Ans: Index offers a lookup capability to rapidly reach the vicinity of the desired record.
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Define lock? Lock is the most common used to execute the requirement is to permit a transaction to access a data item only if it is currently holding a lock on that item.
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explain thee diffrent types of data models
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