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Multi-Query Optimization Revisited: A Full-Query Algebraic Method.

Yicheng Tu1, Mehrad Eslami1, Zichen Xu2

  • 1Dept. of Computer Science, University of South Florida, Tampa, Florida, USA.

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|August 28, 2023
PubMed
Summary
This summary is machine-generated.

PsiDB processes many database queries together by creating one expression that includes all necessary data. This system uses novel operators and optimization rules, improving performance significantly.

Keywords:
Batch processingEquivalence rulesQuery optimizationQuery processing

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Area of Science:

  • Database Systems
  • Query Processing and Optimization

Background:

  • Sharing data and computation for concurrent queries is a key research area in database systems.
  • Existing systems lack a strong logical foundation for query processing and optimization.
  • There is a need for efficient methods to handle large numbers of database queries concurrently.

Purpose of the Study:

  • To present PsiDB, a novel system model for batch processing of numerous database queries.
  • To introduce a logical framework for query processing and optimization in concurrent environments.
  • To develop new algebraic optimization techniques for concurrent queries.

Main Methods:

  • Developed PsiDB, a system model that generates a single query expression for batch processing.
  • Proposed the use of specialized relational operators, termed Psi-operators, for combining queries.
  • Formulated algebraic equivalence rules to transform concurrent queries and identify optimization opportunities.

Main Results:

  • The PsiDB model effectively combines individual queries into a global expression.
  • Developed optimization rules centered around Psi-operators, encompassing existing techniques and revealing new ones.
  • Experimental results show up to 36X performance improvement compared to a mainstream commercial DBMS.

Conclusions:

  • PsiDB provides a robust logical foundation for concurrent query processing and optimization.
  • The proposed Psi-operators and optimization rules offer significant performance benefits.
  • PsiDB demonstrates superior efficiency for batch processing of large numbers of database queries.