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