Unisys Corporation

P J Landresse

Suprio Pal

Vikki Mei-Whey Lai

The method of the present invention is useful in a computer system including a server accessing a database and connected to a magnetic tape drive and operates to expedite the retrieval of audit files on tape while performing a database recovery. The program executes a method for locating a group of audit files of a database that is backed-up on magnetic tape media. The method includes the steps of creating a Tapeset for the group of audit files, initializing a disk directory file which holds positional information of the Tapeset, and locating each of the audit files within the group of audit files using the positional information contained in the disk directory file.

Method for tracking audit files spanning multiple tape volumes

A method is provided in a multi-processing system where multiple user programs can operate concurrently and simultaneously to access a series of database access methods which hold multiple buffer units. Thus, there can operate simultaneously a series of Write operations to the buffer units which copy the buffer information into specialized file structures followed by a parallel series of Input/Output completion operations which test the results of the copy operations followed by parallel and simultaneous writing to the file structures of the storage control information necessary to maintain their physical integrity.

High speed method for flushing data buffers and updating database structure control information

A multi processor system is interconnected through a memory means to multiple numbers of database engines on which there can operate multiple numbers of user programs in order to select buffers which have been modified so that the data in the buffers can be written or copied to a storage medium holding database file structures. The user programs operate in parallel so that multiple concurrent update operations can be continuously completed.

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Capistrano Beach, CA, United States of America

P J Landresse