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...
We start by changing a handful of configuration settings. The two lines in pg_hba.conf ensure that the rep_user user can connect to both the replication stream on the origin server, along with any database we might want to use as a source for table replication.
The other settings are for postgresql.conf, and if you followed the Configuration – getting it right the first time recipe in Chapter 3, Minimizing Downtime, on configuration, you should already have all of these set properly. We change wal_level to logical because that's a requirement to use logical replication in PostgreSQL. The previous replica setting is only suitable for standard streaming replication.
We also need to increase max_replication_slots if it is a low ...
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