February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Considering quorum
Quorum can best be explained by imagining any voting system. It's a result of trusted consensus and relies on multiple implementations backed by dissertation and quantitative study. The most common way to guarantee a quorum for a PostgreSQL cluster is by utilizing a witness node. This exists only to vote and observe the state of the cluster. This helps us reach maximum availability by guaranteeing there's always an active primary node.
In this recipe, we'll examine why it's important to apply the concept of quorum to our PostgreSQL cluster, and how we may do so.
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