DATA COMPRESSION METHOD

WIPO Patent Application WO/2020/137611

A1

The present invention achieves a balance between saving memory and saving disk capacity. A data compression unit 12 fetches uncompressed data stored in time series from a memory 3, compresses the data, and generates a first block comprising the compressed compression data, and a data storage unit 13 re-stores the first block in the memory 3. A block joining unit 14 joins a prescribed number of first blocks, and a joined block compression unit 15 re-compresses the joined prescribed number of first blocks and generates a second block comprising the re-compressed recompression data. A search information generation unit 16 generates a representative key from a plurality of first block unique keys included in the second block, applies the generated representative key to the second block, and generates and retains data search information associating a second block representative key and the plurality of first block unique keys included in the second block. A data write unit 17 writes the second block to which the representative key was applied into a file on a disk 5.

FUKUDA TETSUYA (JP)
SATO KENICHI (JP)
OMURA KEI (JP)

PCT/JP2019/048912

July 02, 2020

December 13, 2019

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NIPPON TELEGRAPH & TELEPHONE (JP)

H03M7/30; G06F16/174

JP2014052899A	2014-03-20
JP2012095227A	2012-05-17

OTSUKA, SHINGO ET AL.: "Two-stage compression for file search system", IEEJ TRANSACTIONS C, vol. 121, no. 7, 1 July 2001 (2001-07-01), pages 1252 - 1260
FUKUDA, TETSUYA ET AL.: "Two-stage compression method for memory reduction when storing Iot data", LECTURE PROCEEDINGS OF THE 2019 IEICE GENERAL CONFERENCE : INFORMATION AND SYSTEM 1, 5 March 2019 (2019-03-05), pages 39

MIYOSHI Hidekazu et al. (JP)

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