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Support by Adding Indexes
Multiple indexes can be used to access a data file by multiple access paths. In such a scheme only single copy of the data is consider, only the number of paths is added with the use of indexes. Let us talk about two main approaches in this category: Multi-List file organisation and Inverted file organisation.
What do you mean through integrity constraints? Integrity Constraints -An integrity constraint is a condition specified on a database schema and restricts the data in which
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
Identify the need and use of data control through problem solving, illustration
1. Determine that the Checkpoints are a part of Ans: Checkpoints are a part of Recovery measures
#ques Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a p
What are the comparison operator in SQL? Comparison operator in SQL are =, LIKE and BETWEEN
What do you mean by atomicity and aggregation? Atomicity : Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete trans
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
Discuss the problem of Spurious tuples and how we may prevent it. Ans: A spurious tuple is, mainly, a record in a database that gets created while two tables are joined bad
what is RDBMS? how it works? good example.
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