Optimizer for use in a data base system
CA 1270061 C · Owner: Data General Corporation · Inventors: Green, Nancy L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optimizer-code generator for use in a data base system. The optimizer-code generator employs a component called a scan analyzer for performing, implementation-dependent analysis and providing implementation-dependent query code. The optimizer-code generator receives a query in logical tree form. It firstoptimizes the logical tree. In so doing it provides infor-, mation from the logical tree to the scan analyzer which, specifies what methods are available for accessing information required for the query and what each of the available methods costs. The optimizer-code generator uses the cost information in its optimization of the logical tree and specifies the access methods to be used in …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted June 5, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 5, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.