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…
Why even have this recipe? We're glad you asked!
We introduced PgBouncer in Chapter 4, Proxy and Pooling Resources, and it gives us the ability to transparently redirect application connections from one server to another without interrupting transaction activity. This is the secret sauce that no other proxy approach can match.
A virtual IP address would interrupt active transactions unless we stopped the application. HAProxy would as well. The only proxy software that understands the PostgreSQL communication protocol is PgBouncer, and we want to take advantage of that.
The other essential capability PgBouncer provides is to PAUSE and RESUME session activity. Unlike RECONNECT, which only marks existing connections as needing ...
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