초록 ▼

In a distributed processing system network in which at least one node operates as a source location having access to data objects of a database, and at least one other node operates as a replica location storing replicas of data objects from the source location, managing obsolescence of the replicas

In a distributed processing system network in which at least one node operates as a source location having access to data objects of a database, and at least one other node operates as a replica location storing replicas of data objects from the source location, managing obsolescence of the replicas is performed by having the replica locations submitting requests to the source location for ascertaining obsolescence of data objects. The source location, responsive to a request from a requesting replica location, extracts identifiers of a set of obsolete objects and communicates them to the requesting replica location. Upon receiving the identifiers, the requesting location renders inaccessible those data objects corresponding to the identifiers received. The source location then removes those identifiers that have been communicated to the requesting replica location.

대표청구항 ▼

A method for managing obsolescence of replicas of data objects, the objects being utilized in multiple nodes of a distributed processing system in which at least one node operates as an object source location having access to a source database containing source data objects and at least one other no

A method for managing obsolescence of replicas of data objects, the objects being utilized in multiple nodes of a distributed processing system in which at least one node operates as an object source location having access to a source database containing source data objects and at least one other node operates as an object replica location having means for storing replicas of requested objects received from a source location, each source data object being alterable whereby replicas of altered objects stored at replica locations may become obsolete, comprising the steps of: responsive to a request from a first replica location to ascertain obsolescence of data objects, extracting at the source location identifiers of a set of obsolete objects; communicating said identifiers, if any, as an atomic demand/response transaction to said first replica location; rendering inaccessible at said first replica location any replicas corresponding to those identifiers received from the source location; and removing from the source location those identifiers communicated to said first replica location.