num_pages: 210
description: Many businesses are burdened by legacy ISs--existing systems that contain valuable data but lack the power or the agility to meet current organizational requirements. Since such systems are by nature resistant to modification, the only way an enterprise can gain full use of the data within one is to move to a completely new IS--ideally, one that won't become a legacy itself in a few years. This book discusses the challenges and provides a framework for a workable system migration, based on incremental modifications that allow the manager to control cost and risk. Focusing on data migration, the authors outline key techniques for transforming a legacy IS into a flexible system that meets current needs and is adaptable to unpredictable future changes. Because designing, developing, testing, and deploying a new system all at once would be extremely risky, the authors advocate a step-by-step strategy that migrates the system to a decomposable target environment while the current IS remains completely operational. Their flexible 11-step method allows any IS to be migrated incrementally, using gateways to access data reliably and accurately without any downtime.Because each company's IS is as unique as its business strategy, the authors focus on the choices and pitfalls that may be encountered in an IS migration. Drawing on over 45 years of collective IS experience, they illustrate their work with two complete case studies of migration projects they worked on themselves. Their versatile solution is effective for any migration, including those to a client/server environment using relational DBMSs and 4GLs.Features a special survey of migration tools by Jennifer Schmidt.ContentsForeword, by Blayne MaringPreface1. Problems and possibilities of legacy IS migration2. Migrating decomposable legacy ISs3. Case study 1: Migrating Money Central´s Cash Management System4. Migrating semidecomposable legacy ISs5. Case study 2: Migrating Global telecom´s Telephone Provisioning System6. Migrating nondecomposable legacy Iss7. Migrating legacy ISs: A general case8. Distributed computing and incremental migration9. Toll wish list10. A practical implementation with migration tools (by Jennifer Schmidt)GlossaryReferencesIndexAbout the authors
language: English
title: Migrating Legacy Systems: Gateways, interfaces and the incremental approach
titlecomplete: Migrating Legacy Systems: Gateways, interfaces and the incremental approach
ratings_count: 5
publisher: Morgan Kaufmann Pub