2025
Otus - PG Lock Mechanisms 0:00 of 1:14:39
    https://www.youtube.com/watch?v=fZ5kVn8fR24
2023
Tenzor - Borovikov - Backend School - 7 Locks of 1:04:52
    https://www.youtube.com/watch?v=RjLlixMdnSQ
    https://www.postgresql.org/docs/current/explicit-locking.html
    ! https://www.postgresql.org/docs/current/sql-lock.html
    ! 6:00  - https://www.postgresql.org/docs/current/functions-admin.html
    !   pg_cancel_backend, pg_terminate_backend
    ! 9:00  - pg_advisory_unlock(*) -- outside of tran
    ! 10:00 - commit/rollback/rollback to sp, exception in stored proc
    ! 11:00 - lock types:
    !   table-level, row-level, page-level, advisory, deadlocks
    ! 12:00 - table-level locks - https://www.postgresql.org/docs/current/explicit-locking.html#LOCKING-TABLES
    ! 13:00 - table-level modes
    !   AS  - access share            - select put this on all tables and all its indices from query, lock ... nowait
    !   RS  - row share               - select ... for ...
    !   RE  - row exclusive
    !   SUE - share update exclusive
    !   S   - share
    !   SRE - share row exclusive
    !   E   - exclusive
    !   AE  - access exclusive
    ! 20:00 - ... nowait - either now or exception is thrown
    ! 22:00 - lock_timeout(integer) - https://www.postgresql.org/docs/current/runtime-config-client.html#GUC-LOCK-TIMEOUT ch19 (server config)
    ! 23:00 - alter_in_transaction_session_timeout (for mezkih clients)
    ! 25:00 - row-level locks - https://www.postgresql.org/docs/current/explicit-locking.html#LOCKING-ROWS
    ! 27:00 - row-level modes
    !   RS  - select ... for key share
    !   S   - select ... for share
    !   SRE - select ... for no key update, update [*]
    !   E   - select ... for update, delete, update (cols of unique idx)
    ! 32:00 - page-level locks - https://www.postgresql.org/docs/current/explicit-locking.html#LOCKING-PAGES
    !   S   - share
    !   E   - exclusive
    !   !!! mostly hw-level (should not see in normal flow)
    ! 33:00 - advisory locks https://www.postgresql.org/docs/current/explicit-locking.html#ADVISORY-LOCKS
    !   blocked resource - arbitrary number (64-bit)
    !   PG-only thing - https://www.postgresql.org/docs/current/functions-admin.html#FUNCTIONS-ADVISORY-LOCKS
    !   pg_advisory_*(...), tg_try_advisory_(...), pg_advisory_unlock_all(hiliotina)
    !   S   - share
    !   E   - exclusive
    !   problems - max_locks_per_transaction * max_connections
    ! 51:00 - deadlocks - https://www.postgresql.org/docs/current/explicit-locking.html#LOCKING-DEADLOCKS
    ! 59:00 - pg_stat_activity - https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-PG-STAT-ACTIVITY-VIEW
    !   wait event types
    ! 1:02:00 - pg_locks where not granted
2019
HighLoad - Rogov - PG Locks of 48:42
    https://www.youtube.com/watch?v=_R2-IsKfsUU
    https://highload.ru/moscow/2019/abstracts/6067
2012
https://www.youtube.com/watch?v=s3ee0nuDDqs
    https://momjian.us/main/writings/pgsql/locking.pdf