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Patent Searching and Data


Title:
DATA AREA EXPANSION SYSTEM
Document Type and Number:
Japanese Patent JPH07152642
Kind Code:
A
Abstract:

PURPOSE: To improve program performance by decreasing the frequency of a block input/output process which is generated when a block expanded on an external storage device is accessed.

CONSTITUTION: In addition to blocks A and B stored in a basic memory 2, the external storage device 3 is stored with blocks C-E exceeding the capacity of the basic memory 2, A block management table 1 is used to manage the storage positions and update states of the blocks. When the block B in the basic memory 2 and the block C on the external storage device 3 are swapped, the block management table 1 of the block B is referred to and when the block B is not updated, the block C is read in the basic memory 2, but when the block B is not updated, the block C is read in the basic memory 2 after the block B is saved on the external storage device 3.


Inventors:
HIRAYAMA KENICHI
YAMAMITSU TADASHI
Application Number:
JP29785393A
Publication Date:
June 16, 1995
Filing Date:
November 29, 1993
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
G06F9/445; G06F12/08; (IPC1-7): G06F12/08; G06F9/445
Attorney, Agent or Firm:
Makoto Suzuki