November 2019
Beginner to intermediate
470 pages
11h 59m
English
Content preview from Mastering PostgreSQL 12 - Third Edition
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Digging into transaction wraparound-related issues
There are two more settings in postgresql.conf that are quite important to understand to really make use of PostgreSQL. As we have stated already, understanding VACUUM is key to performance:
autovacuum_freeze_max_age = 200000000 autovacuum_multixact_freeze_max_age = 400000000
To understand the overall problem, it is important to understand how PostgreSQL handles concurrency. The PostgreSQL transaction machinery is based on the comparison of transaction IDs and the states transactions are in.
Let's look at an example. If I am transaction ID 4711 and if you happen to be 4712, I won't see you because you are still running. If I am transaction ID 4711 but you are transaction ID 3900, I will ...
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