Methods and apparatus for accesssing non-relational data files using relational queries
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United States of America Patent
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-
Jan 3, 1995
Grant Date -
N/A
app pub date -
Dec 7, 1990
filing date -
Dec 7, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A relational data access facility allows relation-type queries to access data stored in non-relational data files by converting relational queries into a set of common commands which are sent to data drivers to obtain the data specified by those queries. The facility uses metadata which describes the organization of the data in the non-relational files, and examines the expressions in the relational queries to formulate an access plan for the data. The plan is formulated to reduce cost and promote efficiency.
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