Optimization of query processing with cache conscious buffering operator

Yoshishige Tsuji, Hideyuki Kawashima, Ikuo Takeuchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The difference between CPU access costs and memory access costs incurs performance degradations on RDBMS. One of the reason why instruction cache misses occur is the size of footprint on RDBMS operations does not fit into a L1 instruction cache. To solve this problem Zhou proposed the buffering operator which changes the order of operation executions. Although the buffering operator is effective, it cannot be applied for RDBMS in the real business. It is because Zhou does not show an algorithm for optimizer to select the buffering operator. Thus we realized the CC-Optimizer which includes an algorithm to appropriately select the buffering operator. Our contributions are the design of new algorithm on an optimizer and its implementation to RDBMS. For experimental RDBMS, we used PostgreSQL as Zhou did, and our machine environment was Linux Kernel 2.6.15, CPU Intel Pentium 4(2.40GHz). The result of preliminary experiments showed that CC-Optimizer was effective. The performance improvement measured by using OSDL DBT-3, was 73.7% in the greatest result, and 17.5% in all queries.

Original languageEnglish
Title of host publicationDatabases in Networked Information Systems - 6th International Workshop, DNIS 2010, Proceedings
Number of pages15
Publication statusPublished - 2010
Externally publishedYes
Event6th International Workshop on Databases in Networked Information Systems, DNIS 2010 - Aizu-Wakamatsu, Japan
Duration: 2010 Mar 292010 Mar 31

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume5999 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Other6th International Workshop on Databases in Networked Information Systems, DNIS 2010

ASJC Scopus subject areas

  • Theoretical Computer Science
  • General Computer Science


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