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Explain the phases of query processing in distributed database.
written 7.9 years ago by gravatar for teamques10 teamques10 ★ 70k modified 3.6 years ago by gravatar for DevarenjiniP DevarenjiniP • 3.2k
distributed databases
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written 3.6 years ago by gravatar for DevarenjiniP DevarenjiniP • 3.2k

Layers of Query Processing

Query processing has 4 layers:

• Query Decomposition

• Data Localization

• Global Query Optimization

• Distribution Query Execution

1

Query Decomposition

The first layer decomposes the calculus query into an algebraic query on global relations. The information needed for this transformation is found in the global …

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