Database input/output control system having nonvolatile storing

Details Database input/output control system having nonvolatile storing Database input/output control system having nonvolatile storing

1992-04-02

1995-08-08

Kulik, Paul V.

Boots, shoes, and leggings

364DIG1, 364243, 3642432, 3642435, 364246, 36424611, 364254, 3642543, 395485, 395486, 39549704, 395600, 395402, G06F 1212

Patent

active

054407125

ABSTRACT:
An extended storage unit is utilized to write back information into a slow external storage unit asynchronously with respect to a request from a user's program when the I/O frequency of the external storage unit drops below a certain level. Extended storage information output unit 120 writes blocks 141 contained in extended storage unit 140 into database 101 in the external storage unit 100. A timer 170 actuates extended storage information output unit 120 at preset timer count values. I/O monitoring unit 110 monitors the I/O quantity of a physical I/O unit 130 and actuates the extended storage information output unit 120 based on the I/O quantity. A logical I/O unit 160 shifts information between a buffer 151 in main storage unit 150 and the extended storage unit 140 and makes I/O requests to the physical I/O unit 130.

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