2024
AzatYakupov - BTree Index in PG 0:00 of 1:09:10
    https://www.youtube.com/watch?v=hMoBH7drftk
JPoint - Salnikov - PostgreSQL Indices ru 0:00 of 2:00:44
    https://www.youtube.com/watch?v=ju9F8OvnL4E
    https://squidex.jugru.team/api/assets/srm/5a15546d-af53-46d4-be84-63367a5aaaf3/jpoint2022.andrei-.salsnikov.pdf
2023
JPoint - Sitnikov - B-Tree indices using Boot, PostgreSQL, JPA 18:00 of 45:07
    https://www.youtube.com/watch?v=y-Wtyvme4gE
    ! using indices improves search-perf, but degrades ins/upd perf
    ! indices have types
    ! 21:30 explain (analyze, costs off, buffers)  -- buffers is aprox about num of disk ops
    ! b-tree index has nodes with like 100 children
    ! 26:00 index only scan
    !   Heap Fetches: 4 (pg went into table because of visibility/autovac)
    ! 28:00 index on random uuid - will have more r/w
    !   because of randomizeness (pg optimized insert of sequential values)
    !   !!! UUID v7 can generate sequential ones
    !   select ... from users where state = 'PENDING' and name = ?
    !       create index state_name_users on users(name) include(state)  -- idx will not sort by state, just include it
    !   create index of (col1, col2) -- index sorted on combination of state, name
Tenzor - Backend School - PG Indices p2 0:00 of 1:21:33
    https://www.youtube.com/watch?v=WTELBpLUb2E
Tenzor - Backend School - PG Indices p1 0:00 of 1:10:44
    https://www.youtube.com/watch?v=sNCKlklvGO0
2017
BartunovKorotkov - All truth about Indices 0:00 of 46:35
    https://www.youtube.com/watch?v=aaecM4wKdhY