February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Getting ready
The primary criteria for establishing a quorum is that we must satisfy the capability for avoiding tie votes, also known as establishing consensus. Basically, this means we must have an odd number of PostgreSQL nodes within our cluster such that there's always a majority. We should already have a preliminary node count by working through previous recipes in this chapter, in particular, the Picking redundant copies recipe and the Selecting locations recipe.
That being said, the concept of quorum is only necessary in clusters that intend to provide automated failover capabilities. If this is not going to be a feature of the end architecture, this recipe may be skipped.
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