Data Intensive Systems-Software Engineering-Lecture Slides, Slides of Software Engineering

Download Data Intensive Systems-Software Engineering-Lecture Slides and more Slides Software Engineering in PDF only on Docsity! CS 501: Software Engineering Fall 2000 Lecture 14 System Architecture I Data Intensive Systems docsity.com 2 Administration Midterm examination, October 16, 7:30 to 8:30 p.m. -- Hollister B14 (note change of room) -- See course notices for sample questions docsity.com 5 Example 1: Electricity Utility Billing First attempt: Data input Master file Transaction Bill Each transaction handled as it arrives. docsity.com 6 Criticisms of First Attempt Where is this first attempt weak? The requirements have not been specified!!! docsity.com 7 Transaction Types • Create account / close account • Meter reading • Payment received • Other credits / debits • Check cleared / check bounced • Account query • Correction of error • etc., etc., etc., docsity.com 10 Batch Processing: Master File Update Master file update Bills Validated transactions in batches Sort by account errors Reports Instructions docsity.com 11 Benefits of Batch Updating • All transactions for an account are processed together • Backup and recovery have fixed checkpoints • Better management control of operations • Efficient use of staff and hardware docsity.com 12 Online Inquiry Data input Master file Transactions Bills read only Customer service docsity.com 15 Database Architecture Customer & account database Products & services database External services docsity.com 16 Real-time Transaction Customer & account database Products & services database External services Real-time transactions docsity.com 17 Real-time Transactions & Batch Processing Customer & account database Products & services database External services Real-time transactions Batch processing Data input docsity.com 20 Merger of Two Banks: Options ??? ??? A B docsity.com 21 Merger of Two Banks: Architectural Options I. Convert everything to System A. convert databases retrain staff enhance System A (software and hardware) discard System B II. Build an interface between the databases in System A and System B. III. Extend client software so that it can interact with either System A or System B database. docsity.com 22 Distributed Computing: General Problem An application that is running on one computer wishes to use data or services provided by another: • Network connection private, public, or virtual private network location of firewalls • Protocols point-to-point, multicast, broadcast message passing, RPC, distributed objects stateful or stateless • Quality of service docsity.com