February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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This may seem familiar
Believe it or not, it's very likely you've encountered this concept without even realizing it. Internet service providers or application hosts often advertise how many 9s of availability their platform can maintain. It's often presented as a chart like this:
|
Uptime (%) |
Daily |
Weekly |
Monthly |
Yearly |
|
99 |
14m 24s |
1h 40m 48s |
7h 18m 18s |
3d 15h 39m 30s |
|
99.9 |
1m 26s |
10m 5s |
43m 50s |
8h 45m 57s |
|
99.99 |
8.6s |
1m 1s |
4m 23s |
52m 36s |
|
99.999 |
0.9s |
6s |
26.3s |
5m 16s |
As you can imagine, it's generally more desirable to stay toward the higher end of 9s to minimize downtime. On the other hand, this is highly restrictive, as Five 9s only allows just over five minutes of downtime over ...
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