International Business Machines Corporation

Randy Keith Rolfe

Kathryn Rose Steinbrink

Mark John Anderson

Larry Wayne Loen

Leon Edward Gregg

Jonathan Lee Triebenbach

Richard Donald Parrott

Ritchie Lee Nyland

Kevin Robert Brettin

Renee Kristin Saxman

Mark William Theuer

Nicholas Todd Lawrence

Kyle Gilbertson

Michael Alan Venz

Craig Stephen Aldrich

Steven Virgil Hoeschen

Jane Ann Vold

Theresa Renee Euler

Scott Joseph Heimer

Russ Owen

Russell Edward Bruhnke

William T Burke

Wayne Christopher Sadecki

Kathy Lynn Passe

Jason John Spieth

Susan Liisa Romano

Theodore J Friedl

Systems and methods are provided for handling synchronous requests from a requesting entity. Illustratively, the requesting entity is in a database management system and the requests are made to a catalog server. The catalog server is configured to respond to the requests by accessing a catalog database. An interface is provided between an application and a catalog server. The interface is configured to determine whether the catalog server is available to handle requests. If the catalog server is unavailable and if the request is a synchronous request, the interface determines whether the request may be processed asynchronously.

Methods and systems for asynchronous catalog requests for system objects via secure table look-up

Dependent object processing for triggers

Method and system for monitoring and securing data access in a database system

A data storage medium having the ability to recover from media errors includes a directory located at any desired region of a data storage area with redundant directory pointers at reserved locations. A unique file token is included in the directory entry for each data file and is also included in each extent list where the locations of parts of a fragmented data file are stored. Multiple extent lists are chained in two directions to facilitate reconstruction of the chain if part of the pointer information is lost.

Data file directory system and method for writing data file directory

A removable optical disk of the write once type is managed to minimize size of the control area for user data recorded on the disk. Instead of recording each recorded file indicating token (serial number) as each file is recorded, a maximum value file token having a numerical value greater than a previous maximum value token is recorded in the control area such that any optical recorder receiving the disk may start recording data using such maximum value token. If the file indicating token values reach the maximum value token, then a new maximum value token is created. A pseudo end of volume (EOV) value is maintained which points to a one of the addressable data storing ares of the disk which is allocated and not recorded as EOV. All allocated data storing areas with addresses greater than EOV are recorded in contiguously addressed data storing areas. When any data storing area having an address higher than EOV is left unrecorded, then EOV is updated to point to that unrecorded allocated data storing area. When either the maximum value token or EOV are changed or updated, both the EOV and maximum value token are recorded in the control area. Operations in a closed environment, super or umbrella allocation sizes and reduced EOV values are also disclosed.

System for allocating worm optical medium file storage in groups of

A WORM data storage medium includes primary and secondary data storage areas in which data and pointers to allocated but unwritten update areas are written. Original and updated data is written in a write sequence or chain of primary data areas separated by branched secondary data storage areas. The most recent updated data is found in a two level search of primary and then secondary data storage areas in order to save time by searching only those secondary areas where the most recent update exist.

Structured data storage method and medium

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Rochester, MN, United States of America

Randy Keith Rolfe