Data processing method using record division storing scheme and apparatus therefor

• US 20010007107A1
• Filed: 03/02/2001
• Published: 07/05/2001
• Est. Priority Date: 07/09/1992
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamaguchi, Kota
• Granted Patent: US 6,954,759 B2
• Time in Patent Office: Days
• US Class Current: 707/1
• CPC Class Codes: G06F 16/9024 Graphs; Linked lists G06F16/9027 takes precedence
• CPC Class Codes: Y10S 707/99931 Database or file accessing
• CPC Class Codes: Y10S 707/99943 Generating database or data structure, e.g. via user interface

Abstract

A record having a fixed length data portion and a variable length data portion is stored in memory units, each capable of being inputted/outputted independently, in unit of sub-record while the fixed length data portion is divided into a plurality of fixed length sub-records each having the same length and the variable length data portion is made one variable length sub-record. When data operation of the record such as retrieval, update and deletion is required, sub-records necessary for the data operation are limited and the data operation is made in a unit of one or more sub-records, so that data processing of unnecessary sub-records is not made.

Claims

1. A data processing method in which a record including a fixed length data portion and a variable length data portion is divided to be stored in a plurality of memory units, comprising:

dividing said fixed length data portion into a plurality of fixed length sub-records each having the same length;

making said variable length data portion a variable length sub-record;

dividing said fixed length sub-records and said variable length sub-record to be stored in a plurality of memory units;

managing a storage situation of said memory units as file definition information collectively; and

performing data processing of said record in a unit of sub-record with reference to said file definition information.

2. A data processing method according to

claim 1

, wherein

said fixed length sub-records are stored in locations having the same physical address of said plurality of memory units.

3. A data processing method according to

claim 2

, wherein

a storage address of said variable length sub-record in said memory unit is registered in any one of said fixed length sub-records.

4. A data processing method according to

claim 1

, wherein

data processing of said record includes retrieval, update and deletion.