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Database Systems MCQs (Computer Science) From Textbook

Database Systems Certification MCQs – Practice Test 3 (Chapter 17)

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Query Optimization Quiz – Practice Test 3 PDF Download

MCQ 11: An option in view maintenance, in which only the affected part of the view is modified is known as:

  1. Immediate view maintenance
  2. Deferred view maintenance
  3. Data-view maintenance
  4. Incremental view maintenance

MCQ 12: The process of replacement of a nested query by a query with a join is called:

  1. Correlation
  2. Decorrelation
  3. Materialization
  4. Non-materialization

MCQ 13: The technique chosen by the database system for evaluation of an operation depends on the size of:

  1. Relation
  2. Distribution of columns
  3. Distribution of tuples
  4. Both A and B

MCQ 14: The term that optimizes subexpressions shared by different expressions in a program is called:

  1. Multiple subexpression elimination
  2. Common subexpression elimination
  3. Parametric subexpression elimination
  4. Shared subexpression elimination

MCQ 15: Each relational-algebra expression represents a particular sequence of:

  1. Parameters
  2. Differentials
  3. Operations
  4. Routines

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