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Browse Prior Art Database

Index On Optical Image

IP.com Disclosure Number: IPCOM000100707D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Jaaskelainen, W: AUTHOR [+5]

Abstract

Massive quantities of objects or documents which can be stored on a Mass Optical Storage Device (MOSD) can be most efficiently indexed for search, categorization, and retrieval by maintaining an index on DASD which duplicates some of the document description detail information which is actually written to MOSD.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 73% of the total text.

Index On Optical Image

       Massive quantities of objects or documents which can be
stored on a Mass Optical Storage Device (MOSD) can be most
efficiently indexed for search, categorization, and retrieval by
maintaining an index on DASD which duplicates some of the document
description detail information which is actually written to MOSD.

      As each Document is written to the MOSD, the following
processing takes place:
      1.  A DASD object ID is mapped to an optical path name.
      2.  A record in a DASD indexed file is created with a key equal
to the DASD object ID.  Within this record the following information
is stored:
          a.  The optical path name (or abbreviated identifier).
          b.  A subset of the document detail information.
          c.  Identifiers which specify the logical partitions of the
              MOSD document.
          Note that the optical path name is implicitly derived if a
folder/subdirectory is used as the indexing vehicle.

      When a document is retrieved from the MOSD, the following
processing takes place:
 1.  The DASD object ID is used to retrieve the correct record from
the DASD indexed file.
 2.  The path name from this record, and the DASD object ID, is used
to formulate a request for retrieval of an object from the MOSD.
Since this record contains identifiers (byte off sets within the data
stream) which define logical segments of the d...