Query Processing in AutoMed

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Query Processing in AutoMed

• 07 Feb 2007
• Birkbeck

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Changes

• Previous Functionality
• Only GAV reformulation
• Needed to accommodate LAV/BAV reformulation
  techniques
• Recent Changes
• Query Processor
• Configuration file
• Query Reformulation

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Query Processor Architecture
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Query Processor

• Instantiation.
• Single or multiple instances in same JVM.
• User-defined integration semantics.
• QP controlled by a configuration file.

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Configuration File

• Options
• Pluggable components
• Reformulation techniques
• Range Semantics

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Reformulation techniques supported

• GAV (old GAV component deprecated)
• LAV using Inverse Rules algorithm
• BAV

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Reformulation Design

• Three layers
• Atomic Views for each pathway six view maps are
  created, one for each transformation type.
• Composite Views uses Atomic Views to produce the
  view definition of each global schema construct
  in terms of a single source schema.
• Reformulation uses Composite Views to produce
  the view definition of each global schema
  construct in terms of all source schemas.