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Insuring Insert Integrity Over Variable-Length, Spanned Records

IP.com Disclosure Number: IPCOM000063762D
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Gregg, LE Loen, LW Satin, RH [+details]

Abstract

In certain data base log data sets new data is only added at the end of the data set. Existing data is never updated. This invention describes a method of being able to know if all changes to a data page have been recorded on the non-volatile store without the necessity of synchronously writing the page. The advantage this provides is verification of data integrity without the performance degradation of synchronous page writes as each entry is added to the data base log. In a paging environment data pages are normally on disk storage. When a page must be used or modified, it is brought into the machine's main storage. At some time changed data pages are written back to the disk storage.