Shows
Postgres FMPostgres 17Nikolay and Michael discuss the fresh new Postgres 17 release! They cover several performance improvements, favourite new features, and some considerations for upgrading. Here are some links to things they mentioned:Postgres 17 release notes https://www.postgresql.org/docs/17/release-17.htmltransaction_timeout episode https://postgres.fm/episodes/transaction_timeoutVACUUM improvements discussed towards end of episode with Melanie Plageman https://postgres.fm/episodes/getting-started-with-benchmarkingB-tree improvements discussed in episdode with Peter Geoghegan https://postgres.fm/episodes/skip-scanAs Rails developers, why we are excited about PostgreSQL 17 (blog post by Benoit Tigeot) https://benoittgt.github.io/blog/postgres_17_rails/ Real World Pe...2024-09-2742 minPostgres FMGet or CreateMichael and Nikolay are joined by Haki Benita, a technical lead and database enthusiast who writes an excellent blog and gives popular talks and training sessions too, to discuss the surprisingly complex topic of trying to implement “get or create” in PostgreSQL — handling issues around idempotency, concurrency, and bloat. Here are some links to things they mentioned:Haki Benita https://hakibenita.com How to Get or Create in PostgreSQL (blog post by Haki) https://hakibenita.com/postgresql-get-or-create "Find-or-insert" using a single query (how-to guide by Nikolay) https://gitlab.com/postgres-ai/postgresql-consulting/postgres-howtos/-/blob/main/0036_find-or-insert_using_a_s...2024-08-2350 minPostgres FMWhy isn't Postgres using my index?Nikolay and Michael discuss a common question — why Postgres isn't using an index, and what you can do about it! Here are some links to things they mentioned:Why isn’t Postgres using my index? (blog post by Michael) https://www.pgmustard.com/blog/why-isnt-postgres-using-my-index Why isn’t Postgres using my functional index? (Stack Exchange question from Brent Ozar) https://dba.stackexchange.com/questions/336019/why-isnt-postgres-using-my-functional-index enable_seqscan (and similar parameters) https://www.postgresql.org/docs/current/runtime-config-query.html Crunchy Bridge changed random_page_cost to 1.1 https://docs.crunchybridge.com/changelog#postgres_random_page_cost_1_1 Make indexes invisible...2024-02-2335 minPostgres FMHash indexesNikolay and Michael discuss hash indexes in Postgres — what they are, some brief history, their pros and cons vs btrees, and whether or when they recommend using them.Update: the idea Nikolay mentioned at the end of this episode turns out to be a little fraught (and as such, inadvisable). Here are some links to things they mentioned:Index types (docs) https://www.postgresql.org/docs/current/indexes-types.html Re-introducing hash indexes in PostgreSQL (blog post by Haki Benita and Michael) https://hakibenita.com/postgresql-hash-index Hash indexes intro (docs) https://www.postgresql.org/docs/current...2023-12-1530 min
PyConIsraelHaki Benita- Taming Nondeterminism With Dependency InjectionThere are many sources of nondeterminism in code such as randomness, IO, environment variables, databases and many more. Dependency injection is a pattern that provides a way to control nondeterminism in code and make tests easier to write.
In this talk I'll demonstrate how nondeterminism can pose challenges even in simple functions, and how to use dependency injection to address these problems!
2023-08-0100 minPostgres FMRead-only considerationsNikolay and Michael discuss a listener request — special considerations for databases that are used in a read-only mode all day, and get an update at night with additional data.Here are links to a few things we mentioned: Index-only scansVacuumUK Covid-19 dashboardpg_repackPartitioningOur episode on BRIN indexesAlways load sorted data (blog post by Haki Benita)GIN indexes: the good and the bad (blog post by Lukas Fittl)Our episode on materialised viewspg_buffercacheTowards Millions TPS (blog post by Alexander Korotkov)Postgres WASM (by Snaplet and Supabase)YugabyteAWS Aurora Continuous Archiving and Point-in-Time Recovery (docs)Our episode on c...2023-04-1439 minPostgres FMTOASTNikolay and Michael discuss TOAST (The Oversized-Attribute Storage Technique) — what it is, how it works, and some general things to be aware of. Here are links to a few things we mentioned: TOAST docsTOAST wikiHussein Nasser on rows per page (Twitter)Toasting in action (dbi services blog)Interview with Peter Zaitsev (Postgres TV)Building columnar compression in a row-oriented database (Timescale blog post)The Surprising Impact of Medium-Size Texts on PostgreSQL Performance (blog post by Haki Benita)PostgreSQL at Scale: Saving Space Basically for Free (blog post by Braintree on column Tetris)postgres_dba alignment padding quer...2023-03-0328 minPostgres FMJSONNikolay and Michael discuss JSON — our options for storing it in Postgres, whether or when we should, as well as a brief intro and some tips for JSON functions available. Here are links to a few things we mentioned: hstoreXML typeXML functionsJSON typesJSON functionsJSONB indexingNULLS episodeWhy Postgres is popular episodePostgreSQL 12 release notesWhat’s New in SQL:2016 (blog post by Markus Winand)SQL/JSON is postponed (blog post by depesz) JSON[b] Roadmap (talk by Oleg Bartunov)Slides, with benchmarksRUM access methodJSON in PostgreSQL: how to use it right (blog post by Laurenz Albe from Cybertec)pg_jsonsch...2023-02-2431 min
Code with Jason160 - PostgreSQL with Andrew AtkinsonIn this episode I talk with Andrew Atkinson about PostgreSQL and databases. We talk about check constraints, foreign keys, and other PostgreSQL/database concepts.Andy Atkinson.comAndrew Atkinson on TwitterAndrew Atkinson on GitHubPuny to Powerful PostgreSQL Rails Apps (RailsConf 2022 talk)Creating a constraint that is initially "not valid"Slides 16 & 17 of this presentation also deal with "not valid" constraintsThe Strong Migrations gem at GithubLukas Fittl's pganalyzeHaki Benita's post on adding constraints without validating immediately2022-08-2957 minPostgres FMHow to become a DBAAnd few things we mentioned: Topic request on Reddit — thanks HerbyHoover!Haki Benita's blog PostgreSQL documentation (table of contents) Planet PostgreSQL (blog aggregator) MVCC Unmasked (by Bruce Momjian) The Internals of PostgreSQL (by Hironobu SUZUKI)PostgreSQL 14 Internals — parts I and II (by Egor Rogov)Cybertec blogmodern-sql.com (by Markus Winand)use-the-index-luke.com (by Markus Winand)The Art of PostgreSQL (by Dimitri Fontaine) explain.depesz.comexplain.dalibo.com ------------------------What did you like or not like? What should we discuss next time? Let us know by tweeting us on @samokhvalov and @michristofidesIf you would l...2022-08-2632 minPostgres FMNULLs: the good, the bad, the ugly, and the unknownHere are links to a few things we mentioned: Three-valued_logic (Wikipedia)Postgres 15 improves UNIQUE and NULL (blog post by Ryan Lambert) Practical SQL for Data Analysis — Interpolation (blog post by Haki Benita) What is the deal with NULLs? (blog post by Jeff Davis) NULL in SQL: Indicating the Absence of Data (Markus Winand on Modern SQL) The Art of PostgreSQL (book by Dimitri Fontaine) ------------------------What did you like or not like? What should we discuss next time? Let us know by tweeting us on @samokhvalov and @michristofidesIf you w...2022-08-0527 min