Method and means for cataloging data sets using dual keyed data

Details Method and means for cataloging data sets using dual keyed data Method and means for cataloging data sets using dual keyed data

1980-05-27

1983-10-04

Gruber, Felix D.

Boots, shoes, and leggings

G06F 700

Patent

active

044082738

ABSTRACT:
A data set catalog structure eliminates the requirement for base catalog/data volume synchronization in a multi-processing environment while enabling the operating efficiency directly addressing the data volumes. The catalog is distributed between a keyed sequential base catalog and, on each data volume, an entry sequential volume data set. Catalog information which must be synchronized with application data sets is stored in volume records in the volume data set.
A method for opening a user's data set having a key comprises the steps of obtaining from the base catalog a direct pointer associated with the key to the volume record for the user data set; accessing the volume record (relative byte address) addressed by the pointer; comparing the key of the user data set with the key of the accessed volume record; if the keys do not compare, key searching the volume data set to locate the volume record containing correct key and rewriting the direct pointer in the base catalog to address the correct volume record, and obtaining from the correct volume record a direct pointer to the user data set.

REFERENCES:
patent: 3400371 (1968-09-01), Amdahl
patent: 3597745 (1971-08-01), Lahrson
patent: 3670310 (1972-06-01), Bharwani
patent: 4068300 (1978-01-01), Bachman
"Shared Direct Access Storage Device Support Improvement", P. C. Jacobs, IBM TDB vol. 14, No. 3, p. 935.
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IBM System/360 Operating System Introduction, IBM Publication Number GC 22-6534.
VSAM Primer and Reference, IBM Publication No. G320-5774-0, Section 3.
OS/VS2 System Programming Library: Data Management, IBM Publication No. GC26-3830-3.
VSAM Catalog Structures and Comparison of VSAM Catalogs and OS CVOL's, Palo Alto Systems Center Bulletin, No. 220-2841.
"Dynamic Catalog Structure", N. J. King, IBM TDB vol. 13, No. 6, p. 1692.

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