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System for accessing a row of time-dependent data by referring to a composite index table indicating page locations of linked row labels

  • US 5,253,361 A
  • Filed: 09/15/1989
  • Issued: 10/12/1993
  • Est. Priority Date: 09/15/1989
  • Status: Expired due to Term
First Claim
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1. A method executed by a computer system as part of a computer program for retrieving data from a database, said data being stored in a plurality of data pages, each of said data pages having associated therewith one of a plurality of time occurrences which specifies how often said data is monitored, each of said data pages comprising a plurality of data rows and a page index which stores pointers to each of said data rows, each of said data rows comprising a row label and a plurality of data cells, one of said data cells being linked to said row label and said other data cells being linked sequentially therefrom, a composite index table storing on what page each of said data rows is stored, said method comprising the steps of:

  • (a) selecting a data row;

    (b) selecting a time interval;

    (c) searching said composite index table to find on what pages said data row is stored by finding a row label associated with said data row;

    (d) searching each of said pages for data cells which correspond to said data row during said time interval by traversing from said row label through said data cells which are linked together; and

    (e) retrieving data from said data cells from said data row which match said time interval.

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