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Another memory trick to calculate the allowed downtime duration for an "-nines" availability percentage is to use the formula seconds per day. For example, 90% ("one nine") yields the exponent 4 − 1 = 3 {\displaystyle 4-1=3} , and therefore the allowed downtime is 8.64 × 10 3 {\displaystyle 8.64\times 10^{3}} seconds per day.
Download QR code; Print/export Download as PDF; ... 45 minutes, 36 seconds 99.99% 4 nines ... Level 1 Uptime Monitoring – Availability of a Critical Page ...
In this context, a "one nine" (90%) uptime indicates a system that is available 90% of the time or, as is more commonly described, unavailable 10% of the time – about 72 hours per month. [8] A "five nines" (99.999%) uptime describes a system that is unavailable for at most 26 seconds per month.
Uptime is a measure of system reliability, expressed as the period of time a machine, typically a computer, has been continuously working and available. Uptime is the opposite of downtime. Htop adds an exclamation mark when uptime is longer than 100 days.
For example, if a bus is 4 minutes 20 seconds late, a rules may be applied that a bus is only late when later than 5 minutes, so this service would be counted as on time. The choice of threshold for lateness is an important one, with a low threshold resulting in a lower on time performance statistic.
The term "second" comes from "the second minute division of an hour", as it is 1 ⁄ 60 of a minute, or 1 ⁄ 60 of 1 ⁄ 60 of an hour. While usually sub-second units are represented with SI prefixes on the second (e.g. milliseconds ), this system can be extrapolated further, such that a "Third" would mean 1 ⁄ 60 of a second (16.7 ...
The book Social Media Marketing for Dummies in 2007 considered Confluence an "emergent enterprise social software" that was "becoming an established player." [11] Wikis for Dummies described it as "one of the most popular wikis in corporate environments," "easy to set up and use," and "an exception to the rule" that wiki software search capabilities don't work well.
As the two planets have an apparent size smaller than one arc minute, occultations are extremely rare: this is the closest approach since 1623 and the next occultation will happen in the year 7541. [594]