Title:
【発明の名称】データベース管理装置
Document Type and Number:
Japanese Patent JP2828354
Kind Code:
B2
Abstract:
PURPOSE:To reconcile the data retrieval having data at a specified period as reference and the reduction of the waiting time of data update when data is retrieved and updated by means of a multi-task. CONSTITUTION:A flag showing whether correction is executed or not and a pointer showing the address of a corrected data storage destination are provided for a record before correction. When data is corrected, the correction flag is set, the record storing corrected data is added, and the address of the added record is stored in the pointer. When data is corrected, (step 70), a corrected update number is checked and whether it is the update number before a file is opened is judged (step 60). When it is before open, the next history record is read. When it is after open, data on the record concerned is transmitted. Thus, data can be retrieved with data when the file is open as the reference even if data is updated while data is retrieved.
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Inventors:
MIZUTANI MANABU
Application Number:
JP10939291A
Publication Date:
November 25, 1998
Filing Date:
May 14, 1991
Export Citation:
Assignee:
PII SHII EE KK
International Classes:
G06F12/00; G06F17/30; (IPC1-7): G06F17/30
Domestic Patent References:
| JP5862744A | ||||
| JP2148175A | ||||
| JP2141874A | ||||
| JP21055A | ||||
| JP6380325A | ||||
| JP225974A |
Attorney, Agent or Firm:
Atsushi Nakajima (1 person outside)