Most of what I've learned has come from PG docs and various blogs on "we found this crazy thing costing us 100x memory/processing/response time/etc" But there

Most of what I've learned has come from PG docs and various blogs on "we found this crazy thing costing us 100x memory/processing/response time/etc" But there is a great book on the internals (very long, in depth, but not unreadable if you have a good foundation already) - https://edu.postgrespro.com/postgresql_internals-14_en.pdf https://edu.postgrespro.com/postgresql_internals-14_en.pdf They probably have newer versions, this is just what's in my bookmarks