Accession Number : ADD016435

Title :   Method of Database Synchronization with Consistency Determined by Entry and Exit Counters Used on Both Update and Retrieval.

Descriptive Note : Patent, Filed 3 Oct 91, patented 26 Apr 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Tavares, Carlos M ; Tavares, Durval M ; Caron, Donald R ; Bagley, John B

Report Date : 26 Apr 1994

Pagination or Media Count : 6

Abstract : A system for updating and reading a data base utilizes a pair of counters where one counter is incremented prior to an update and the other is incremented following an update. The system permits the updating to take place at any time. By keeping track of the value of the counters the system either inhibits the reading from taking place during the updating if the updating commenced prior to the commencement of the reading or provides information that an updating occurred during the reading if the reading commenced prior to the commencement of the updating. The counters and data base are located within the RAM of a computer. The system has a first application program that gives information to a second application program via these RAM based components.

Descriptors :   *COUNTERS, *DATA BASES, *PATENTS, COMPUTERS, READING, TIME, TRACKS, VALUE, RANDOM ACCESS COMPUTER STORAGE

Subject Categories : Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE