×

Method, computer program product, and system for rewriting database queries in a heterogenous environment

  • US 6,526,403 B1
  • Filed: 12/17/1999
  • Issued: 02/25/2003
  • Est. Priority Date: 12/17/1999
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for performing query rewrite in a heterogeneous database environment that preserves optimal pushdownability comprising:

  • storing the results of a pushdown analysis on a database query, said results including the pushdownability of portions of the database query;

    rewriting a portion of the database query;

    performing a pushdown analysis on the rewritten portion of the database query; and

    if the pushdownability of the rewritten portion is greater than the pushdownability of the original portion, updating the stored results of the pushdown analysis to reflect the pushdownability of the rewritten portion of the database query.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×