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Enforcement of referential constraints in a database system

  • US 5,386,557 A
  • Filed: 11/12/1992
  • Issued: 01/31/1995
  • Est. Priority Date: 10/13/1989
  • Status: Expired due to Term
First Claim
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1. A method for generating an access plan for a relational database, having a plurality of database objects, from a plurality of database access commands used to access the database objects, said method comprising the steps performed by a computer system of:

  • compiling the plurality of database access commands into a first executable code set for inclusion in the access plan;

    during said compiling step, determining constraint relationships among selected database objects utilized during execution of the plurality of database access commands;

    also during said compiling step, generating a plurality of second executable code sets to enforce the determined constraint relationships; and

    also during said compiling step, merging the first executable code set and the plurality of second executable code sets to form an access plan having both code for executing the database access commands and code for enforcing the determined constraint relationships within the access plan.

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