Tandem Computers Incorporated

Informix Software, Inc.

Eric G Strellis

Srinivasa D Murthy

Franco Putzolu

Alan Bram

Alan M Usas

Gary F Tom

Jeffrey Lichtman

Nathaniel G Wyatt

Richard N Hillegas

Minoo Gupta

A data replication processing system includes a source database system and one or more target database systems all of which are coupled through a network. The replication processing system provides a replication protocol that allows for the source database and the target databases to remain consistent and in agreement. A method for the replication processing system includes having a target database request a refresh of its subset of the source database from the source database system. The source database system receives the refresh request message and constructs a refresh reply message that includes transactions from the source and the target. The target database system receives the refresh reply message from the source database system and applies the changes to its subset of the source database so that the two databases are in agreement with respect to their appropriate data sets.

Data replication system and method

A multiprocessor that includes a virtual file system providing a file system interface to user application code. This interface allows users to access files in many types of file systems in a consistent, file system-independent manner. In a preferred embodiment, the higher interface of the file system is the Posix file system interface, though it can be any file system interface supporting the capabilities required by a user process. The Posix file system supports regular files, pipes, fifos and special files. A pipe server, a pipe library and a name server together implement the fifo semantics required by the Posix standard for Posix processes. The present invention provides these fifo capabilities to any process which uses the Posix interfaces.

Distributed pipes and fifos in a multiprocessor

Growing community of inventors

Albany, CA, United States of America

Eric G Strellis