Gapless sequences

Postgres FM

Content provided by Michael Christofides and Nikolay Samokhvalov. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by Michael Christofides and Nikolay Samokhvalov or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://podcastplayer.com/legal.

1M ago 39:49

MP3•Episode home

Nik and Michael discuss the concept of gapless sequences — when you might want one, why sequences in Postgres can have gaps, and an idea or two if you do want them.

And one quick clarification: changing the CACHE option in CREATE SEQUENCE can lead to even more gaps, the docs mention it explicitly.
Here are some links to things they mentioned:

CREATE SEQUENCE https://www.postgresql.org/docs/current/sql-createsequence.html
Sequence Manipulation Functions https://www.postgresql.org/docs/current/functions-sequence.html
One, Two, Skip a Few (post by Pete Hamilton from Incident io) https://incident.io/blog/one-two-skip-a-few
Postgres sequences can commit out-of-order (blog post by Anthony Accomazzo / Sequin) https://blog.sequinstream.com/postgres-sequences-can-commit-out-of-order
Logical Replication of sequences (hackers thread) https://www.postgresql.org/message-id/flat/CAA4eK1LC%2BKJiAkSrpE_NwvNdidw9F2os7GERUeSxSKv71gXysQ%40mail.gmail.com
Synchronization of sequences to subscriber (patch entry in commitfest) https://commitfest.postgresql.org/patch/5111/
Get or Create (episode with Haki Benita) https://postgres.fm/episodes/get-or-create
German tank problem https://en.wikipedia.org/wiki/German_tank_problem

~~~

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

166 episodes

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