February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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PostgreSQL multi-master solutions use logical replication to transfer data between nodes by necessity. As a result, software versions need not match. This means that PostgreSQL 11 and PostgreSQL 12 nodes may coexist in the same cluster. Combined with a proxy layer as recommended, this allows fully online, major-version upgrades. From an RTO perspective, this means the following elements may all be assumed to contribute zero or a small number of milliseconds:
- Node failover and switchover
- Minor upgrades (v12.1 to v12.2)
- Node maintenance
- Major upgrades (v11 to v12)
Due to its proprietary nature, PostgreSQL multi-master is generally not available without additional cost. Consider any associated pricing when tabulating RTO architecture ...
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