Data Compression/Decompression Device

摘要

When compressing an arrangement of fixed-length records in a columnar direction, a data compression device carries out data compression aligned with the performance of a data decompression device by computing a number of rows processed with one columnar compression from the performance on the decompression device side, such as the memory cache capacity of the decompression device or the capacity of a primary storage device which may be used by an application, and the size of one record. Thus, while improving compression ratios of large volumes of data, including an alignment of a plurality of fixed-length records, decompression performance is improved.

主权项

1. A data decompression device that decompresses compressed data including a plurality of compressed fixed-length records, wherein:
the compressed data includes a result acquired by dividing compression object data in units of predetermined compression object block size and compressing the data every compression object block; when the compression object block size is determined based upon the size of the fixed-length record and the specification information of the data decompression device, the size of the compression object block is determined based upon the size of the fixed-length record and the specification information of the data decompression device;
one or more compression object blocks are acquired based upon the compressed data; and a columnar data decompression unit that decompresses each compressed columnar data as a result of compressing the same columnar data of the plurality of fixed-length records included in the compression object block every column and restores the plurality of fixed-length records is provided.