I'll take a closer look to the material, which is already good.
It's sad that there does not seem to be anything past "DBA1" (that is, no DBA2 or DBA3).
https://edu.postgrespro.com
There's some stuff for internals (mentioned in a sibling comment), as well as what seems like stuff for PG15 though I haven't looked at it.
I'll take a closer look to the material, which is already good.
It's sad that there does not seem to be anything past "DBA1" (that is, no DBA2 or DBA3).