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Software Engineering vocabulary · Debugging and Troubleshooting

Uptime

Meaning in software engineering, with examples

/ˈʌptaɪm/nounCore term

In software engineering, uptime means: The time or percentage of time that a system is working and available, often written as a figure such as 99.9 percent over a month or a year.

In Turkish: çalışma süresi, erişilebilirlik oranı, uptime

How it is used

Engineers talk in 'nines': 'three nines' is 99.9 percent (about 8.8 hours of downtime a year), 'four nines' is 99.99 percent (about 53 minutes a year). Uptime figures appear in SLAs and on status pages.

Example sentences

  1. We had 99.95 percent uptime last quarter, just above our target.

  2. An uptime monitor checks the homepage every minute from five countries.

Common collocations

  • 99.9 percent uptime
  • uptime monitoring
  • guarantee uptime
  • improve uptime
  • downtimeThe amount of time a system or service is not available to users, either because of a failure or because of planned maintenance.
  • SLAShort for service level agreement: a contract that promises customers a certain level of service, such as 99.9 percent uptime, and says what happens if it is not met.
  • SLOShort for service level objective: an internal reliability target for a service, such as 99.9 percent of requests succeeding over 30 days.
  • high availabilityDesigning a database system so that it keeps working with very little downtime, even if a server, disk or data center fails.
  • monitoringContinuously collecting and checking data about systems, such as CPU use, error rates and response times, so that problems are noticed quickly.

This word in other fields

The same English word can have a different meaning in another field:

More terms: Debugging and Troubleshooting

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