February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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How it works...
Notice how we don't really recommend a specific backup method, how it should be stored, or how filesystem-based features might contribute. All of those things are implementation details and don't matter as much as the rules themselves.
Consider the first rule: keep at least three copies of your data. Since our PostgreSQL instance is the first copy, we need two more. What might these two be? Could we use one replica and a backup? Maybe we could use two replicas? Perhaps, but let's examine the remaining rules first.
Imagine we've produced a PostgreSQL backup, and it's stored on our primary server and the same filesystem as the database instance. What happens if that storage device is damaged or destroyed? Now, we've lost the ...
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