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Database query code generation and optimization based on the cost of alternate access methods

  • US 4,829,427 A
  • Filed: 05/25/1984
  • Issued: 05/09/1989
  • Est. Priority Date: 05/25/1984
  • Status: Expired due to Term
First Claim
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1. In a digital computer system employing a data base system for accessing stored data, means for transforming logical query data representing a query to be performed by said data base system into query code executable by said data base system comprising:

  • (1) implementation-dependent analysis means for receiving certain said logical query data representing a said query and responding thereto by providing a cost data specifying the cost of an operation in said data base system specified by certain said logical query data and implementation-dependent portions of said query code required to perform said specified operation; and

    (2) implementation-independent transformation means for modifying said logical query data in response to said cost data and producing said executable query code containing said implementation-dependent portions from said analysis means.

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