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1. (WO2017154065) COMPUTER AND DATABASE MANAGEMENT METHOD

Pub. No.:    WO/2017/154065    International Application No.:    PCT/JP2016/056934
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Tue Mar 08 00:59:59 CET 2016
IPC: G06F 17/30
G06F 12/00
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: WATANABE, Satoru
渡辺 聡
Title: COMPUTER AND DATABASE MANAGEMENT METHOD
Abstract:
In a system in which a database process among processes of a computer is offloaded to one or more hardware circuits, each of which comprises a memory, the computer divides a column store database, which is configured of a plurality of records and a plurality of columns, into a plurality of data segments. One or more columns of the plurality of columns are respectively one or more columns to be compressed. Each of the plurality of data segments comprises: a column store database portion which is configured of one or more records of the plurality of records; and a compression dictionary, which is a dictionary which is used in expanding one or more of the column portions to be compressed among said column store database portion. In each of the plurality of data segments, the size of the compression dictionary is less than or equal to the size of the memory.