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Self adapting history data compression method

A technology for historical data and data compression, applied in the field of adaptive historical data compression, which can solve the problems of reduced data compression rate and relatively large impact of data compression rate.

Inactive Publication Date: 2003-12-03
INST OF SOFTWARE - CHINESE ACAD OF SCI
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Problems solved by technology

[0008] 1). The size of the compression deviation parameter has a great influence on the data compression rate obtained by using the revolving door algorithm;
[0009] 2). Very sensitive to measurement error. When the measurement error of the sensor is relatively large, the data compression rate obtained by using the revolving door algorithm is significantly reduced

Method used

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Embodiment Construction

[0035] specific implementation plan

[0036] The present invention is described in detail below with reference to accompanying drawing and in conjunction with embodiment:

[0037] figure 1 is a flowchart of an embodiment of the adaptive data compression method according to the present invention. First obtain the current measurement value from the historical data buffer queue step 1. Then, go to step 2 of judging the compression time. For the current measured value, first judge whether the difference between the measured time and the measured time of the previous storage point is less than the minimum compression time or greater than the maximum compression time. This step simply judges the data before the compression process , only when the current measurement time difference is within a given time range, the next step of compression processing is performed on the current measurement data. When the current measurement time difference is less than the minimum compression tim...

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Abstract

An adaptive history data compression method includes such steps as judging if the time when current measured value is measured is in the compression time range, storing the preceding value of current value as the beginning point of next data compression test and new preceding stored point if the time difference of current time is to longer, calculating the slope of current value and current maximal and minimal slopes, adaptively dynamic calculation of compression deviation parameter, calculating the upper and lower limits of current value's slope, compression test of current value, and storing the preceding value of current value.

Description

technical field [0001] The invention relates to a historical data compression technology in a real-time database, in particular to an adaptive historical data compression method. Background technique [0002] For a real-time database, due to the huge amount of data, the management of data archives is undoubtedly one of the most important parts, and the key technology is whether it can store and access data efficiently. Due to the large amount of historical data, if it is not compressed directly, it will require a large physical storage medium. Therefore, the compression of historical data has become one of the most important technologies in real-time databases. [0003] In the real-time database system, the use of historical data compression technology is traditionally used to reduce disk space. There are many methods for data compression for different applications. The real-time database system not only requires the ability to store a large number of Historical data, but a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/00
Inventor 王宏安金宏王强戴国忠
Owner INST OF SOFTWARE - CHINESE ACAD OF SCI
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