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60 строки
2.6 KiB
Plaintext
60 строки
2.6 KiB
Plaintext
https://www.postgresql.org/docs/current/storage.html
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https://www.postgresql.org/docs/current/storage-page-layout.html
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https://postgrespro.ru/docs/postgrespro/current/storage-page-layout
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hot
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https://www.postgresql.org/docs/current/storage-hot.html
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! pg_stat_all_tables
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!!!
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https://github.com/dmagda/DevMastersDb/blob/main/postgres/postgres_mvcc_backstage.md
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https://postgrespro.com/blog/pgsql/5967910
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https://habr.com/ru/companies/postgrespro/articles/449704/
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https://habr.com/ru/companies/postgrespro/articles/483768/
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https://opensource-db.com/postgresql-mvcc/
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!!! *from -> show hidden columns (ctid, xmin, xmax)
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https://cloud.google.com/blog/products/databases/deep-dive-into-postgresql-vacuum-garbage-collector
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!!!
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https://dev.to/nilelazarus/series/23873
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https://dev.to/nilelazarus/demystifying-the-internals-of-postgresql-chapter-5-2pe4
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2024
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Otus - MVCC, vacuum and autovacuum in PG ru of 1:22:40
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https://www.youtube.com/watch?v=mrobq6Ggggc
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! 12:00 - pg_size_pretty, pg_total_relation_size
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! 25:00 - insert
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! add new record with xmin=txid_current(), xmax=0
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! delete - xmax=txid_current()
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! update - for old record we do delete
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! xmax=txid_current(),
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! for new one - insert
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! xmin=txid_current(), xmax=0
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! 26:00 rollback - xmax_aborted
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! 28:00 select *, xmin, xmax, cmin, cmax, ctid from user_data;
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! 29:00 select * from pg_stat_user_tables;
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! n_live_tup, n_dead_tup, ratio%, last_autovacuum, ...
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! 31:00 - ... from heap_page_items(get_raw_page('user_data', 0)) -- neet to set ext
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! https://www.postgresql.org/docs/current/pageinspect.html
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! https://eax.me/pageinspect/
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! 44:00 vacuum_cost_delay, vacuum_cost_limit, vacuum_cost_page_miss, vacuum_cost_page_dirty
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! 54:00
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! create table ... (with autovacuum_enabled=off)
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! alter table <rel> set (autovacuum_enabled=on);
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! 55:00 vacuum verbose <rel>;
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! pg_relation_filepath('<rel>');
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! 58:00
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! pg_squeeze ext is not so lock-agressive (gh/cybertec_postgresql/...)
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2022
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https://habr.com/ru/companies/quadcode/articles/671254/
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!
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2020
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https://postgrespro.com/blog/pgsql/5967856
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????
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Rogov - MVCC
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https://habr.com/ru/companies/postgrespro/articles/452762/
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https://habr.com/ru/companies/postgrespro/articles/452320/
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https://habr.com/ru/companies/postgrespro/articles/446652/
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https://habr.com/ru/companies/postgrespro/articles/445820/
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https://habr.com/ru/companies/postgrespro/articles/444536/
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https://habr.com/ru/companies/postgrespro/articles/455590/
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https://habr.com/ru/companies/postgrespro/articles/442804/
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