7 - eBusiness

Aiss have evolved from simple recordkeeping and

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Unformatted text preview: vers and Database Servers make Application and Database make applications and data in databases available to remote clients. AIS’s have evolved from simple recordkeeping and reporting systems to sophisticated Enterprise Application Suite (EAS). An application is a software program for some functional use such as for accounting, communications, or email. SAP integrated operations, human relations, and customer relations into single software packages called ERP systems. ERP A database is an organized collection of data that is structured to be useful to those who use it. ERP systems were expanded to ERP II, and ERP ultimately into the EAS. EAS. BUSI 335 Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 33 BUSI 335 E-Business and Enterprise Architecture Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 34 Client/Server Architecture AIS spet needs to understand how IS is embedded into the enterprise architecture. Enterprise Architecture (EA) describes the joint Enterprise describes structure and behavior of the enterprise and its information system. Source: Database Systems by Rob and Coronel BUSI 335 Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 35 BUSI 335 Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 36 Two-Tier Architectures: Clients Application that fits in this model are referred to as fat clients. All materials regarding client/server computing were directly taken from Microsoft Transaction Server 2.0 by Steven Gary, Rick Lievano, and Roger Jennings BUSI 335 Two-Tier Architectures: Servers • Client’s roles: – Expose an interface through which end users can send requests to the server – Validate user-supplied data – Execute business rules – Submit requests to the server applications User Business Interface Rules Business Rules Client Two common types of servers: - Database servers - Internet servers Data Server Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 37 • Database servers User Business Interface Rules Business Rules BUSI 335 Data Server Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 38 Three-Tier Architectures • Disadvantages of Two-Tier Architectures – Manage client connections and requests to data – Manage security, transaction processing, and backup/recovery of critical business...
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