Presentation Transcript

1. Systems Analysis and Design 9th Edition

   Chapter 12 Managing Systems Support and Security
2. Phase Description Systems Operation, Support, and Security is the final phase in the systems development life cycle You will support and maintain the system, handle security issues, protect the integrity of the system and its data, and be alert to any signs of obsolescence The deliverable for this phase is an operational system that is properly maintained, supported, and secured
3. Chapter Objectives Explain the systems support and security phase Describe user support activities, including user training and help desks Define the four types of maintenance Explain various techniques for managing systems maintenance and support
4. Chapter Objectives Describe techniques for measuring, managing, and planning system performance Explain risk management concepts Assess system security at six levels: physical security, network security, application security, file security, user security, and procedural security
5. Chapter Objectives Describe backup and disaster recovery List factors indicating that a system has reached the end of its useful life Assess future challenges and opportunities for IT professionals Develop a strategic plan for career advancement and strong IT credentials
6. Introduction Managing systems support and security involves three main concerns: user expectations, system performance, and security requirements Successful, robust systems often need the most support In most organizations, more than half of all IT department effort goes into supporting existing systems
7. Overview The systems support and security phase begins when a system becomes operational and continues until the system reaches the end of its useful life After delivering the system, the IT team focuses on support and maintenance tasks
8. User Support User Training Additionally, new employees must be trained on the company’s information systems User training package Training users about system changes is similar to initial training Objective is to show users how the system can help them perform their jobs
9. User Support Help Desks Enhance productivity and improve utilization of a company’s information resources The help desk is a central contact point for all IT maintenance activities Can utilize many types of automated support
10. User Support Outsourcing Issues Offshore call centers can trim expenses and free up valuable human resources for product development Critical factors might include phone wait times, support staff performance, and online support tools
11. Maintenance Tasks
12. Maintenance Tasks Corrective Maintenance Diagnoses and corrects errors in an operational system Respond to errors in various ways, depending on nature Worst-case situation is a system failure When the system is operational again, the maintenance team determines the cause, analyzes the problem, and designs a permanent solution
13. Maintenance Tasks Adaptive Maintenance Adds enhancements to an operational system and makes the system easier to use The procedure for minor adaptive maintenance is similar to routine corrective maintenance Can be more difficult than new systems development because the enhancements must work within the constraints of an existing system
14. Maintenance Tasks Perfective Maintenance Involves changing an operational system to make it more efficient, reliable and maintainable Cost-effective during the middle of the system’s operational life Programs that need a large number of maintenance changes usually are good candidates for reengineering The more a program changes, the more likely it is to become inefficient and difficult to maintain
15. Maintenance Tasks Preventive Maintenance Requires analysis of areas where trouble is likely to occur IT department normally initiates preventive maintenance Often results in increased user satisfaction, decreased downtime, and reduced TCO Sometimes does not receive the high priority that it deserves
16. Maintenance Management The Maintenance Team System administrator Systems analysts Programmers Organizational issues
17. Maintenance Management Maintenance Requests Involve a series of steps All work must be covered by a specific request Initial determination The systems review committee Task completion User notification
18. Maintenance Management Establishing Priorities In many companies, systems review committee separates maintenance requests from new systems development requests Some IT managers believe that evaluating all projects together leads to the best possible decisions Object is to have a procedure that balances new development and necessary maintenance work
19. Maintenance Management Configuration Management As enterprise-wide information systems grow more complex, configuration management becomes critical Also helps to organize and handle documentation
20. Maintenance Management Maintenance Releases A numbering pattern distinguishes the different releases Reduces the documentation burden Service packs Version Control Archived Essential part of system documentation
21. Maintenance Management Baselines Systems analysts use baselines as yardsticks to document features and performance during the systems development process Functional baseline Allocated baseline Product baseline
22. System Performance Management Fault Management The more complex the system, the more difficult it can be to analyze symptoms and isolate a cause The best strategy is to prevent problems by monitoring system performance and workload
23. System Performance Management Performance and Workload Measurement Benchmark testing Metrics Response time Bandwidth and throughput Kbps (kilobits per second) Mbps (megabits per second) Gbps (gigabits per second)
24. System Performance Management Performance and Workload Measurement Turnaround time The IT department often measures response time, bandwidth, throughput, and turnaround time to evaluate system performance both before and after changes to the system or business information requirements Management uses current performance and workload data as input for the capacity planning process
25. System Performance Management Capacity Planning What-if analysis Need detailed information Need an accurate forecast of future business activities Should develop contingency plans based on input from users and management
26. System Performance Management System Maintenance Tools Many CASE tools include system evaluation and maintenance features In addition to CASE tools, you also can use spreadsheet and presentation software to calculate trends, perform what-if analyses, and create attractive charts and graphs to display the results
27. System Security Overview Security is a vital part of every computer system System Security Concepts CIA triangle Integrity Availability Security policy
28. System Security Overview Risk Management Absolute security is not a realistic goal Risk identification - exploit Risk assessment - risk Risk control Avoidance, mitigation, transference, acceptance
29. System Security Overview Attacker Profiles and Attacks An attack might be launched by a disgruntled employee, or a hacker who is 10,000 miles away Attackers break into a system to cause damage, steal information, or gain recognition, among other reasons
30. Security Levels Must consider six separate but interrelated levels Physical Security First level of security concerns the physical environment Physical access to a computer represents an entry point into the system and must be controlled and protected
31. Security Levels Physical Security Operations center security Servers and desktop computers Notebook computers
32. Security Levels Network Security Network Network interface Encrypted Encrypting network traffic
33. Security Levels Network Security Wireless networks Private networks Virtual private networks Ports and services Firewalls
34. Security Levels Application Security Services Hardening Application permissions Input validation Patches and updates Software Logs
35. Security Levels File Security Permissions Read a file Write a file Execute a file Read a directory Write a directory User Groups
36. Security Levels User Security Privilege escalation attack Identity management Password protection Social engineering
37. Security Levels User Security User resistance New technologies Security token Procedural Security Operational security Dumpster diving Paper shredders
38. Backup and Disaster Recovery Backup Policies Backup policy Backup media Rotation schedule Offsiting Backup Types Retention periods
39. Backup and Disaster Recovery Backup Policies
40. Backup and Disaster Recovery Business Continuity Issues Test plan Business continuity plan (BCP) Hot site Data replication
41. System Obsolescence At some point every system becomes obsolete Systems operation and support continues until a replacement system is installed At some point in a system’s operational life, maintenance costs start to increase, users begin to ask for more features and capability, new systems requests are submitted, and the SDLC begins again
42. Future Challenges and Opportunities Predictions The highest priorities will be the safety and security of corporate operations, environmental concerns, and bottom-line TCO Gartner, Inc. is a leading IT consulting firm that is famous for forecasting industry trends Author Randall Stross notes that the enormous amount of energy needed to drive cloud computing, including Google’s servers, has raised serious environmental concerns
43. Future Challenges and Opportunities Strategic planning for IT professionals Working backwards from your long-term goals, you can develop intermediate mile stones and begin to manage your career just as you would manage an IT project Planning a career is not unlike planting a tree that takes several years to reach a certain height
44. Future Challenges and Opportunities IT Credentials and Certification Credentials Certification In addition to Microsoft, many other IT industry leaders offer certification, including Cisco, Novell, Oracle, and Sun Microsystems
45. Future Challenges and Opportunities Critical Thinking Skills Soft skills Certiport, Inc. and the Educational Testing Service (ETS) introduced the iCritical Thinking certification exam Individual and team-based exercises can strengthen critical thinking skills
46. Chapter Summary Systems support and security covers the entire period from the implementation of an information system until the system no longer is used A systems analyst’s primary involvement with an operational system is to manage and solve user support requests Systems analysts need the same talents and abilities for maintenance work as they use when developing a new system Security is a vital part of every computer system
47. Chapter Summary All information systems eventually become obsolete An IT professional should have a strategic career plan that includes long-term goals and intermediate milestones An important element of a personal strategic plan is the acquisition of IT credentials and certifications that document specific knowledge and skills Chapter 12 complete