US 2005/0240359 A1 · In-place dynamically re-sizeable persistent historical database

Abstract

The specification discloses a method of maintaining a historical database of information. The method describes up to eleven segments, each segment corresponding possibly to a different data logging rate in the historical database. Points, whether measured or calculated parameters, are grouped into segments based on which points may have their data logged at the same frequency. The points, in turn, contain pointers to logs, with entries in the log data corresponding to a time-stamp or tag of the segment to which the log belongs. Thus, points (and their corresponding logs) in different segments may be logged at different rates. The specification also discloses a method for dynamically resizing the historical database, which, in the case of increasing the number of entries, results in no loss of historical information.

Claims15

Dependent claims

In an embedded microcontroller based control system reading field parameters and keeping a historical database of the field parameters in a memory device, a method of storing the historical data comprising:

a) grouping a first parameter and a second parameter into a first segment;
b) writing a data value for the first parameter and a data value for the second parameter to the historical database;
c) writing a first segment time-stamp associated with both the data values for the first and second parameters;
d) grouping a third parameter and a fourth parameter into a second segment;
e) writing a data value for the third parameter and a data value for the fourth parameter to the historical database;
f) writing a second segment time-stamp associated with both the data values for the third and fourth parameters;
g) repeating steps b) and c) at a first sample rate;
and
h) repeating steps e) and i) at a second sample rate different than the first sample rate.

6 more elements

In a microcontroller based flow computer calculating volumetric flows and keeping a historical database of field parameters in a memory device, a method of storing the historical data comprising:

a) writing an entry for a first parameter and an entry for a second parameter to the historical database;
b) writing a first grouping time-stamp associated with both the entries for the first and second parameters;
c) writing an entry for the third parameter and an entry for the fourth parameter to the historical database;
d) writing a second grouping time-stamp associated with both the entries for the third and fourth parameters;
e) repeating steps a) and b) at a first frequency;
and
f) repeating steps c) and d) at a second frequency different than the first frequency.

4 more elements

Dependencies are inferred from the claim text.

In-place dynamically re-sizeable persistent historical database

Life of this patent

In-place dynamically re-sizeable persistent historical database

Life of this patent

Abstract

Claims15