Method and apparatus for allocation of disk memory space for com

Details Method and apparatus for allocation of disk memory space for com Method and apparatus for allocation of disk memory space for com

1997-05-06

1999-12-07

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

710 68, 711170, 711171, G06F 1200, G06F 1202, G06F 1300

Patent

active

060000090

ABSTRACT:
A system and method allocates disk memory space for storage of compressed records and enables the compressed records to be stored in sequential physical positions on the disk memory space. The method and apparatus further assures a substantial likelihood that compressed, updated records will fit in the originally allocated physical positions during subsequent processing. The method comprises: compressing a record; determining a compression ratio (CR) value and a maximum run length (RL) of contiguous identical data segments in the uncompressed record; determining a corrected compression ratio (CCR) by repeating compression of the record without the RL of contiguous identical data segments included in the record; and if the CCR value is less than a historically experienced record compression ratio, employing the CCR value to allocate memory space for the compressed record. If CCR value equals or exceeds the ECR value, the ECR value is utilized to allocate memory space for the record.

REFERENCES:
patent: 5394534 (1995-02-01), Kulakowski et al.
patent: 5644791 (1997-07-01), Brady et al.
patent: 5649151 (1997-07-01), Chu et al.

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