Logical replication common issues

Postgres FM

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הוסף לפני three שנים

תוכן מסופק על ידי Michael Christofides and Nikolay Samokhvalov. כל תוכן הפודקאסטים כולל פרקים, גרפיקה ותיאורי פודקאסטים מועלים ומסופקים ישירות על ידי Michael Christofides and Nikolay Samokhvalov או שותף פלטפורמת הפודקאסט שלהם. אם אתה מאמין שמישהו משתמש ביצירה שלך המוגנת בזכויות יוצרים ללא רשותך, אתה יכול לעקוב אחר התהליך המתואר כאן https://he.player.fm/legal.

Worth Knowing with Bonnie Habyan

1
#11: From OJ Simpson Case to Best Selling Author - Marcia Clark Shares Latest Real Crime Book Release and How Resilience Is Key to Success and Reinvention 34:35

לפני 10 ימים34:35

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לייק

אהבתי

34:35

Marcia Clark, best known as the lead prosecutor in the O.J. Simpson trial, has become a trailblazer for women in law and beyond. Her journey from courtroom to bestselling author reflects her resilience and determination to redefine herself amidst intense public scrutiny. On this episode of Worth Knowing, Clark dives into her latest book, *Trial by Ambush*, which examines the 1953 Barbara Graham case—a story that highlights gender bias, media sensationalism, and the notion that all cases are subject to societal, cultural, and political winds. Clark shares how her experiences during the Simpson trial shaped her perspective on societal pressures and the role of women in high-stakes professions. Her reflections on how media, forensic science, and legal practices have evolved over decades offer valuable insights into the intersection of law and culture. This conversation is a compelling exploration of true crime, personal growth, and how Clark’s groundbreaking career continues to inspire a new generation of women to challenge norms and forge their own paths. Marcia Clark is a bestselling author and a criminal lawyer who began her career in law as a criminal defense attorney and went on to become a prosecutor in the L.A. District Attorney's Office in 1981. She spent ten years in the Special Trials Unit, where she handled a number of high-profile cases, including the prosecution of stalker/murderer Robert Bardo, whose conviction for the murder of actress Rebecca Schaeffer resulted in legislation that offered victims better protection from stalkers as well as increased punishment for the offenders. She was lead prosecutor for the O.J. Simpson murder trial. In May of 1997 her book on the Simpson case, "Without a Doubt," was published and reached #1 on the New York Times, Wall St. Journal, Washington Post, Los Angeles Times, and Publishers Weekly bestsellers lists. In February 2016, Clark re-released the book with a new foreword. Resources Sign up for the Worth Knowing LinkedIn Newsletter to stay up to date: https://www.linkedin.com/newsletters/worth-knowing-7236433935503618048/ Follow Bonnie on LinkedIn: https://www.linkedin.com/in/bonnie-habyan/ Go to the Worth Knowing website: https://www.worthknowing.show Check out The Agile Brand Guide website with articles, insights, and Martechipedia, the wiki for marketing technology: https://www.agilebrandguide.com The Agile Brand is produced by Missing Link—a Latina-owned strategy-driven, creatively fueled production co-op. From ideation to creation, they craft human connections through intelligent, engaging and informative content. https://www.missinglink.company…

לפני שנה 38:12

MP3•בית הפרקים

Nikolay and Michael are joined by Sai Srirampur, CEO and Co-founder of PeerDB, to discuss how to overcome several logical replication issues. They discuss the protocol versions, minimising slot growth, minimising lag, and some tips and tricks for scaling things well.
Here are some links to things they mentioned:

PeerDB https://www.peerdb.io/
Our episode on logical replication https://postgres.fm/episodes/logical-replication
Exploring versions of the Postgres logical replication protocol (blog post by Sai) https://blog.peerdb.io/exploring-versions-of-the-postgres-logical-replication-protocol
Logical Streaming Replication Protocol https://www.postgresql.org/docs/current/protocol-logical-replication.html
REPLICA IDENTITY FULL https://www.postgresql.org/docs/current/sql-altertable.html#SQL-ALTERTABLE-REPLICA-IDENTITY
On the performance impact of REPLICA IDENTITY FULL in Postgres (blog post by Xata) https://xata.io/blog/replica-identity-full-performance
max_slot_wal_keep_size https://www.postgresql.org/docs/current/runtime-config-replication.html#GUC-MAX-SLOT-WAL-KEEP-SIZE
Active Active in Postgres 16 (blog post by Crunchy Data) https://www.crunchydata.com/blog/active-active-postgres-16
pgEdge https://www.pgedge.com/
DistSQL (term used by Mark Callaghan) https://smalldatum.blogspot.com/2023/07/keeping-up-with-sql-dbms-market.html
Five tips on Postgres logical decoding (blog post by Sai) https://blog.peerdb.io/five-tips-on-postgres-logical-decoding
PG Slot Notify: Monitor Postgres Slot Growth in Slack (blog post by PeerDB) https://blog.peerdb.io/pg-slot-notify-monitor-postgres-slot-growth-in-slack

~~~

What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc!

~~~

Postgres FM is brought to you by:

Nikolay Samokhvalov, founder of Postgres.ai
Michael Christofides, founder of pgMustard

With special thanks to:

Jessie Draws for the amazing artwork

144 פרקים

#Tech #News #Tech News #Michael Christofides #Nikolay Samokhvalov #Postgres #PostgreSQL #Database #SQL #Technology

Logical replication common issues

Postgres FM

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published לפני שנה

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MP3•בית הפרקים

PeerDB https://www.peerdb.io/
Our episode on logical replication https://postgres.fm/episodes/logical-replication
Exploring versions of the Postgres logical replication protocol (blog post by Sai) https://blog.peerdb.io/exploring-versions-of-the-postgres-logical-replication-protocol
Logical Streaming Replication Protocol https://www.postgresql.org/docs/current/protocol-logical-replication.html
REPLICA IDENTITY FULL https://www.postgresql.org/docs/current/sql-altertable.html#SQL-ALTERTABLE-REPLICA-IDENTITY
On the performance impact of REPLICA IDENTITY FULL in Postgres (blog post by Xata) https://xata.io/blog/replica-identity-full-performance
max_slot_wal_keep_size https://www.postgresql.org/docs/current/runtime-config-replication.html#GUC-MAX-SLOT-WAL-KEEP-SIZE
Active Active in Postgres 16 (blog post by Crunchy Data) https://www.crunchydata.com/blog/active-active-postgres-16
pgEdge https://www.pgedge.com/
DistSQL (term used by Mark Callaghan) https://smalldatum.blogspot.com/2023/07/keeping-up-with-sql-dbms-market.html
Five tips on Postgres logical decoding (blog post by Sai) https://blog.peerdb.io/five-tips-on-postgres-logical-decoding
PG Slot Notify: Monitor Postgres Slot Growth in Slack (blog post by PeerDB) https://blog.peerdb.io/pg-slot-notify-monitor-postgres-slot-growth-in-slack

~~~

What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc!

~~~

Postgres FM is brought to you by:

Nikolay Samokhvalov, founder of Postgres.ai
Michael Christofides, founder of pgMustard

With special thanks to:

Jessie Draws for the amazing artwork

144 פרקים

#Tech #News #Tech News #Michael Christofides #Nikolay Samokhvalov #Postgres #PostgreSQL #Database #SQL #Technology

ทุกตอน

Postgres FM

1
Top ten dangerous issues 46:28

לפני 8 ימים46:28

46:28

Nikolay and Michael discuss ten dangerous Postgres related issues — ones that might be painful enough to get onto the CTO and even CEOs desk, and then what you can do proactively. The ten issues discussed are: Heavy lock contention Bloat control and index maintenance Lightweight lock contention Transaction ID wraparound 4-byte integer PKs hitting the limit Replication limits Hard limits Data loss Poor HA choice (split brain) Corruption of various kinds Some previous episodes they mentioned that cover the issues in more detail: PgDog https://postgres.fm/episodes/pgdog Performance cliffs https://postgres.fm/episodes/performance-cliffs Zero-downtime migrations https://postgres.fm/episodes/zero-downtime-migrations Queues in Postgres https://postgres.fm/episodes/queues-in-postgres Bloat https://postgres.fm/episodes/bloat Index maintenance https://postgres.fm/episodes/index-maintenance Subtransactions https://postgres.fm/episodes/subtransactions Four million TPS https://postgres.fm/episodes/four-million-tps Transaction ID wraparound https://postgres.fm/episodes/transaction-id-wraparound pg_squeeze https://postgres.fm/episodes/pg_squeeze synchronous_commit https://postgres.fm/episodes/synchronous_commit Managed service support https://postgres.fm/episodes/managed-service-support And finally, some other things they mentioned: A great recent SQL Server-related podcast episode on tuning techniques https://kendralittle.com/2024/05/20/erik-darling-and-kendra-little-rate-sql-server-performance-tuning-techniques/ Postgres Indexes, Partitioning and LWLock:LockManager Scalability (blog post by Jeremy Schneider) https://ardentperf.com/2024/03/03/postgres-indexes-partitioning-and-lwlocklockmanager-scalability/ Do you vacuum everyday? (talk by Hannu Krosing) https://www.youtube.com/watch?v=JcRi8Z7rkPg pg_stat_wal https://pgpedia.info/p/pg_stat_wal.html The benefit of lz4 and zstd for Postgres WAL compression (Small Datum blog, Mark Callaghan) https://smalldatum.blogspot.com/2022/05/the-benefit-of-lz4-and-zstd-for.html Split-brain in case of network partition (CloudNativePG issue/discussion) https://github.com/cloudnative-pg/cloudnative-pg/discussions/7462 ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With credit to: Jessie Draws for the elephant artwork…

Postgres FM

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synchronous_commit 50:53

לפני 15 ימים50:53

50:53

Nikolay and Michael discuss synchronous_commit — what it means on single node setups, for synchronous replication setups, and the pros and cons of the different options for each. Here are some links to things they mentioned: synchronous_commit https://www.postgresql.org/docs/current/runtime-config-wal.html#GUC-SYNCHRONOUS-COMMIT synchronous_commit history on pgPedia https://pgpedia.info/s/synchronous_commit.html Patroni’s maximum_lag_on_failover setting https://patroni.readthedocs.io/en/master/replication_modes.html#asynchronous-mode-durability wal_writer_delay https://www.postgresql.org/docs/current/runtime-config-wal.html#GUC-WAL-WRITER-DELAY Selective asynchronous commits in PostgreSQL - balancing durability and performance (blog post by Shayon Mukherjee) https://www.shayon.dev/post/2025/75/selective-asynchronous-commits-in-postgresql-balancing-durability-and-performance/ Asynchronous Commit https://www.postgresql.org/docs/current/wal-async-commit.html synchronous_standby_names https://www.postgresql.org/docs/current/runtime-config-replication.html#GUC-SYNCHRONOUS-STANDBY-NAMES Jepson article about Amazon RDS multi-AZ clusters (by Kyle Kingsbury, aka "Aphyr”) https://jepsen.io/analyses/amazon-rds-for-postgresql-17.4 ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With credit to: Jessie Draws for the elephant artwork…

Postgres FM

1
Managed service support 35:37

לפני 22 ימים35:37

35:37

Nikolay and Michael discuss managed service support — some tips on how to handle cases that aren't going well, tips for requesting features, whether to factor in support when choosing service provider, and whether to use one at all. Here are some links to things they mentioned: YugabyteDB’s new upgrade framework https://www.yugabyte.com/blog/postgresql-upgrade-framework Episode on Blue-green deployments https://postgres.fm/episodes/blue-green-deployments pg_createsubscriber https://www.postgresql.org/docs/current/app-pgcreatesubscriber.html ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With credit to: Jessie Draws for the elephant artwork…

Postgres FM

1
Time-series considerations 42:42

לפני 5 weeks42:42

42:42

Nikolay and Michael discuss time-series considerations for Postgres — including when it matters, some tips for avoiding issues, performance considerations, and more. Here are some links to things they mentioned: Time series data https://en.wikipedia.org/wiki/Time_series TimescaleDB https://github.com/timescale/timescaledb 13 Tips to Improve PostgreSQL Insert Performance https://www.timescale.com/blog/13-tips-to-improve-postgresql-insert-performance Why we're leaving the cloud (37 Signals / Basecamp / David Heinemeier Hansson) https://world.hey.com/dhh/why-we-re-leaving-the-cloud-654b47e0 UUID v7 and partitioning (“how to” by Nikolay) https://gitlab.com/postgres-ai/postgresql-consulting/postgres-howtos/-/blob/main/0065_uuid_v7_and_partitioning_timescaledb.md pg_cron https://github.com/citusdata/pg_cron pg_partman https://github.com/pgpartman/pg_partman Our episode on BRIN indexes https://postgres.fm/episodes/brin-indexes Tutorial from Citus (Andres Freund and Marco Slot) including rollups https://www.youtube.com/watch?v=0ybz6zuXCPo IoT with PostgreSQL (talk by Chris Ellis) https://youtube.com/watch?v=KnUoDBGv4aw&t=58 pg_timeseries https://github.com/tembo-io/pg_timeseries DuckDB https://duckdb.org ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With credit to: Jessie Draws for the elephant artwork…

Postgres FM

1
Performance cliffs 38:08

לפני 6 weeks38:08

38:08

Nikolay and Michael are joined by Tomas Vondra to discuss single query performance cliffs — what they are, why they happen, some things we can do to make them less likely or less severe, and some potential improvements to Postgres that could help. Here are some links to things they mentioned: Tomas Vondra https://postgres.fm/people/tomas-vondra Where do performance cliffs come from? (Talk by Tomas) https://www.youtube.com/watch?v=UzdAelm-QSY Where do performance cliffs come from? (Slides) https://vondra.me/pdf/performance-cliffs-posette-2024.pdf Increase the number of fast-path lock slots (committed for Postgres 18) https://www.postgresql.org/message-id/flat/E1ss4gX-000IvX-63%40gemulon.postgresql.org San Francisco Bay Area Postgres meet-up with Tomas on 8th April (online) https://www.meetup.com/postgresql-1/events/306484787 Our episode on Extended Statistics https://postgres.fm/episodes/extended-statistics Logging plan of the currently running query (proposed patch by Rafael Thofehrn Castro and Atsushi Torikoshi) https://commitfest.postgresql.org/patch/5330 Our episode with Peter Geoghegan on Skip Scan https://postgres.fm/episodes/skip-scan Index Prefetching patch that Tomas is collaborating with Peter Geoghegan on https://commitfest.postgresql.org/patch/4351 A generalized join algorithm, G-Join (paper by Goetz Graefe) https://dl.gi.de/server/api/core/bitstreams/ce8e3fab-0bac-45fc-a6d4-66edaa52d574/content Smooth Scan: Robust Access Path Selection without Cardinality Estimation (paper by R. Borovica, S. Idreos, A. Ailamaki, M. Zukowski, C. Fraser) https://stratos.seas.harvard.edu/sites/g/files/omnuum4611/files/stratos/files/smoothscan.pdf Just-in-Time Compilation (JIT) https://www.postgresql.org/docs/current/jit.html Notes from a pgconf.dev unconference session in 2024 about JIT (discusses issues) https://wiki.postgresql.org/wiki/PGConf.dev_2024_Developer_Unconference#JIT_compilation Implementing an alternative JIT provider for PostgreSQL (by Xing Guo) https://higuoxing.com/archives/implementing-jit-provider-for-pgsql Tomas’ Office Hours https://vondra.me/posts/office-hours-experiment ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With special thanks to: Jessie Draws for the elephant artwork…

Postgres FM

1
PgDog 48:34

לפני 7 weeks48:34

48:34

Nikolay and Michael are joined by Lev Kokotov to discuss PgDog — including whether or when sharding is needed, the origin story (via PgCat), what's already supported, and what's coming next. Here are some links to things they mentioned: Lev Kokotov https://postgres.fm/people/lev-kokotov PgDog https://github.com/pgdogdev/pgdog PgCat https://github.com/postgresml/pgcat Adopting PgCat (Instacart blog post) https://www.instacart.com/company/how-its-made/adopting-pgcat-a-nextgen-postgres-proxy PgDog discussion on Hacker News https://news.ycombinator.com/item?id=43364668 Citus https://github.com/citusdata/citus Sharding & IDs at Instagram (blog post) https://instagram-engineering.com/sharding-ids-at-instagram-1cf5a71e5a5c Sharding pgvector (blog post by Lev) https://pgdog.dev/blog/sharding-pgvector ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With special thanks to: Jessie Draws for the elephant artwork…

Postgres FM

1
Snapshots 44:05

לפני 8 weeks44:05

44:05

Nikolay talks Michael through using cloud snapshots — how they can be used to reduce RTO for huge Postgres setups, also to improve provisioning time, and some major catches to be aware of. Here are some links to things they mentioned: Snapshots on RDS https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_CreateSnapshot.html pgBackRest https://pgbackrest.org WAL-G https://github.com/wal-g/wal-g pg_backup_start and pg_backup_stop (docs) https://www.postgresql.org/docs/current/functions-admin.html#FUNCTIONS-ADMIN-BACKUP How to troubleshoot long Postgres startup (by Nikolay) https://gitlab.com/postgres-ai/postgresql-consulting/postgres-howtos/-/blob/main/0003_how_to_troubleshoot_long_startup.md Restoring to a DB instance (RDS docs mentioning lazy loading) https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_RestoreFromSnapshot.html Amazon EBS fast snapshot restore https://docs.aws.amazon.com/ebs/latest/userguide/ebs-fast-snapshot-restore.html Our 100th episode “To 100TB, and beyond!” https://postgres.fm/episodes/to-100tb-and-beyond ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With credit to: Jessie Draws for the elephant artwork…

Postgres FM

1
GIN Indexes 40:59

לפני 9 weeks40:59

40:59

Nikolay and Michael discuss GIN indexes in Postgres — what they are, what they're used for, and some limitations to be aware of. Here are some links to things they mentioned: GIN Indexes https://www.postgresql.org/docs/current/gin.html Generalized Search Trees for Database Systems (Hellerstein, Naughton, Pfeffer) https://dsf.berkeley.edu/papers/vldb95-gist.pdf RUM extension https://pgxn.org/dist/rum/1.1.0/ Understanding Postgres GIN Indexes: The Good and the Bad (Lukas Fittl) https://pganalyze.com/blog/gin-index ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With credit to: Jessie Draws for the elephant artwork…

Postgres FM

1
Best Practices 40:49

לפני 10 weeks40:49

40:49

Nikolay and Michael use a recent "best practices" article as a prompt — giving a few tips each on the topics mentioned, like schema design, performance, backups, and more. Here are some links to things they mentioned: 7 Crucial PostgreSQL Best Practices (recent blog post) https://speakdatascience.com/postgresql-best-practices “Don't do this” episode https://postgres.fm/episodes/dont-do-this Article discussion on Hacker News https://news.ycombinator.com/item?id=42992913 Mozilla’s SQL Style Guide https://docs.telemetry.mozilla.org/concepts/sql_style “SQL vs NoSQL” episode with Franck Pachot https://postgres.fm/episodes/sql-vs-nosql HA episode https://postgres.fm/episodes/high-availability ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With credit to: Jessie Draws for the elephant artwork…

Postgres FM

1
Extended Statistics 32:41

לפני 11 weeks32:41

32:41

Nikolay and Michael discuss the CREATE STATISTICS feature in Postgres — what it's for, how often it's used, and how to spot cases where it would help. Here are some links to things they mentioned: CREATE STATISTICS https://www.postgresql.org/docs/current/sql-createstatistics.html citext https://www.postgresql.org/docs/current/citext.html Statistics Used by the Planner https://www.postgresql.org/docs/current/planner-stats.html default_statistics_target https://www.postgresql.org/docs/current/runtime-config-query.html#GUC-DEFAULT-STATISTICS-TARGET Tomáš Vondra on Postgres TV https://www.youtube.com/watch?v=8la-OWfD3VI Recent commit to Postgres 18 for pg_upgrade https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=1fd1bd871012732e3c6c482667d2f2c56f1a9395 Multivariate Statistics Examples https://www.postgresql.org/docs/current/multivariate-statistics-examples.html Extended statistics (README) https://github.com/postgres/postgres/blob/master/src/backend/statistics/README How we used Postgres extended statistics to achieve a 3000x speedup (blog post by Jared Rulison) https://build.affinity.co/how-we-used-postgres-extended-statistics-to-achieve-a-3000x-speedup-ea93d3dcdc61 ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With credit to: Jessie Draws for the elephant artwork…

Postgres FM

1
SQL vs NoSQL 50:01

לפני 13 weeks50:01

50:01

Nikolay and Michael are joined by Franck Pachot to discuss SQL vs NoSQL — did Franck change teams by joining MongoDB, normalisation vs denormalisation, developer experience, NULLs, and more! Here are some links to things they mentioned: Franck Pachot https://postgres.fm/people/franck-pachot Franck's workshop at PGConf India https://pgconf.in/conferences/pgconfin2025/program/proposals/958 PostgreSQL Conference Germany https://2025.pgconf.de "Schema Later" Considered Harmful by Michael Stonebraker and Álvaro Hernández https://www.enterprisedb.com/blog/schema-later-considered-harmful Comparison of JOINS by Michael Stonebraker and Álvaro Hernández https://www.enterprisedb.com/blog/comparison-joins-mongodb-vs-postgresql Franck’s post about why he joined MongoDB https://www.linkedin.com/pulse/2025-im-joining-mongodb-franck-pachot-e4shf EdgeDB https://www.edgedb.com Nikolay’s tweet about a recent issue with NULLs https://x.com/samokhvalov/status/1889078097124999272 PartiQL https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ql-reference.html FerretDB https://www.ferretdb.com DocumentDB https://github.com/microsoft/documentdb ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With special thanks to: Jessie Draws for the elephant artwork…

Postgres FM

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Return of the BUFFERS 51:46

לפני 14 weeks51:46

51:46

Nikolay and Michael return to the topic of BUFFERS for the third (and final?) time! They discuss the news that it'll be on by default with EXPLAIN ANALYZE in Postgres 18, and what effect that might have. Here are some links to things they mentioned: Our first BUFFERS episode https://postgres.fm/episodes/buffers-by-default Our second BUFFERS episode https://postgres.fm/episodes/buffers-ii-the-sequel BUFFERS enabled for EXPLAIN ANALYZE by default (commit for Postgres 18) https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=c2a4078ebad71999dd451ae7d4358be3c9290b07 https://explain.depesz.com/history Latency Numbers Every Programmer Should Know https://gist.github.com/jboner/2841832 Twitter conversation about flushing caches https://x.com/prochazkafilip/status/1881655337499205736 pg_buffercache_evict https://www.postgresql.org/docs/current/pgbuffercache.html#PGBUFFERCACHE-PG-BUFFERCACHE-EVICT How to compare the quality of SQL query plans (blog post by Andrei Lepikhov) https://danolivo.substack.com/p/whose-optimisation-is-better We were added as PostgreSQL Contributors! https://www.postgresql.org/about/news/new-postgresql-contributors-3006 ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With special thanks to: Jessie Draws for the elephant artwork…

Postgres FM

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Reads causing writes 26:48

לפני 16 weeks26:48

26:48

Nikolay and Michael discuss a couple of surprising ways read queries (selects) can cause writes (shared buffers dirtied) in Postgres. Here are some links to things they mentioned: Reads causing writes in Postgres (post by Alex Jesipow) https://jesipow.com/blog/postgres-reads-cause-writes/ Exploring how SELECT queries can produce disk writes (post by Nikolay Sivko) https://blog.okmeter.io/postgresql-exploring-how-select-queries-can-produce-disk-writes-f36c8bee6b6f Hint Bits (wiki) https://wiki.postgresql.org/wiki/Hint_Bits pg_stat_statements https://www.postgresql.org/docs/current/pgstatstatements.html pg_stat_kcache https://github.com/powa-team/pg_stat_kcache pg_wait_sampling https://github.com/postgrespro/pg_wait_sampling BUFFERS by default (episode 4!) https://postgres.fm/episodes/buffers-by-default Page layout (docs) https://www.postgresql.org/docs/current/storage-page-layout.html From Reddit (user merlinm), PD_ALL_VISIBLE may be a third case https://www.reddit.com/r/PostgreSQL/comments/1hjuyfn/comment/m3e6e7v/ Coroot https://coroot.com/ ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With special thanks to: Jessie Draws for the elephant artwork…

Postgres FM

1
NOT VALID constraints 33:56

לפני 17 weeks33:56

33:56

Nikolay and Michael discuss adding constraints in an online fashion, using NOT VALID and then VALIDATE CONSTRAINT. Here are some links to things they mentioned: ADD table_constraint NOT VALID https://www.postgresql.org/docs/current/sql-altertable.html#SQL-ALTERTABLE-DESC-ADD-TABLE-CONSTRAINT Our episode on zero-downtime migrations https://postgres.fm/episodes/zero-downtime-migrations VALIDATE CONSTRAINT https://www.postgresql.org/docs/current/sql-altertable.html#SQL-ALTERTABLE-DESC-VALIDATE-CONSTRAINT ALTER TABLE notes https://www.postgresql.org/docs/current/sql-altertable.html#SQL-ALTERTABLE-NOTES pgroll https://github.com/xataio/pgroll ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With special thanks to: Jessie Draws for the elephant artwork…

Postgres FM

1
pg_squeeze 36:26

לפני 18 weeks36:26

36:26

Michael and Nikolay are joined by Antonín Houska to discuss pg_squeeze — what it is, how it started, some of its features, and hopes of getting the functionality into core. Here are some links to things they mentioned: Antonín Houska https://postgres.fm/people/antonin-houska pg_squeeze https://github.com/cybertec-postgresql/pg_squeeze Cybertec https://www.cybertec-postgresql.com pg_repack https://github.com/reorg/pg_repack Introducing pg_squeeze (by Kaarel Moppel) https://www.cybertec-postgresql.com/en/introducing-pg_squeeze-a-postgresql-extension-to-auto-rebuild-bloated-tables pg_squeeze is included in the PostgreSQL APT packages https://wiki.postgresql.org/wiki/Apt pg_squeeze is included in the PostgreSQL Yum packages https://yum.postgresql.org pg_rewrite https://github.com/cybertec-postgresql/pg_rewrite VACUUM FULL / CLUSTER CONCURRENTLY patch https://commitfest.postgresql.org/51/5117 ~~~ What did you like or not like? What should we discuss next time? Let us know via a YouTube comment, on social media, or by commenting on our Google doc ! ~~~ Postgres FM is produced by: Michael Christofides, founder of pgMustard Nikolay Samokhvalov, founder of Postgres.ai With special thanks to: Jessie Draws for the elephant artwork…

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