February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Since data can switch nodes arbitrarily as demonstrated here, upgrades and maintenance to server hardware are much easier. What can we do with the extra node? We can reboot it, apply firmware or kernel updates, apply security patches, or even update the database software to a bug-fix release.
Following any required or suggested changes to the secondary node, we merely promote it to run PostgreSQL in place of the current server. Then, we can repeat modifications on the other node. With this, we can limit outages to a matter of seconds while still providing high uptime guarantees, all without skipping system maintenance.
In fact, this process is so standardized that we will be exploring it in great detail in the next chapter. ...
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