Patent ID: 6226411
Filing Date: 2001-05-01
Classification: G06F,H03M

Abstract:
A method for compressing a file having a plurality of records each consisting of a plurality of columns and created in a predetermined format, comprising the steps of:searching for one or more column locations in which the data is the same throughout the records;calculating the number of records which can be compressed in the file based on the number of the found column locations;determining a first record group consisting of records to be compressed and a second record group consisting of one or more records to be excluded based on the calculated number of records which can be compressed;determining a first record from the first record group, the first record data being kept the same;memorizing the addresses of the found column locations in a second record selected from the first record group, the second record being different from the first record; andtransferring data stored in other column locations in the one or more records in the second record group to the column locations in records in the first record group except the first and the second records.