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Types of Maintenance, These performance measurements, called metrics, can…
Types of Maintenance
Corrective maintenance
- eliminate problems with code
Adaptive maintenance
- taking care of environment changes
Perfective maintenance
- accomodate feature requests or make software more efficient
Preventive maintenance
- changes to an operational system that reduce the possibility of future problems
These performance measurements, called metrics, can monitor the number of transactions processed in a given time period, the number of records accessed, and the volume of online data.
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Configuration Management
- As enterprise-wide information systems grow more complex, configuration management becomes critical
- Most maintenance projects require documentation changes
Release Methodology
- When a maintenance release methodology is used, all noncritical changes are held until they can be implemented at the same time.
- Each change is documented and
installed as a new version of the system called a maintenance release.
Advantages:
- When a release methodology is used, all changes are tested together before a new system version is released.
- This approach results in fewer versions, less expense, and less interruption for users.
- Using a release methodology also reduces the documentation burden, because all changes are coordinated and become effective simultaneously.
Disadvantages:
Users expect a rapid response to their problems and requests, but with a release methodology, new features or upgrades are available less often.
Even when changes would improve system efficiency or user productivity, the potential savings must wait until the next release, which might increase operational costs.
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Bandwidth
Bandwidth describes the amount of data that the system can transfer in a fixed time period. Bandwidth requirements are expressed in bits per second.
Throughput
Throughput measures actual system performance under specific circumstances and is affected by network loads and hardware efficiency. Throughput, like bandwidth, is expressed as a data transfer rate, such as Kbps, Mbps, or Gbps.
Turnaround Time
Turnaround time applies to centralized batch processing operations, such as customer billing or credit card statement processing. Turnaround time measures the time between submitting a request for information and the fulfillment of the request. Turnaround time also can be used to measure the quality of IT support or services by measuring the time from a user request for help to the resolution of the problem.