Index Merges vs Composite Indexes — Is it faster to use a composite index (a.k.a. a multicolumn index) than merge indexes? Yes and, at least in Postgres, by quite a lot, because Postgres doesn’t support index-only scans when queries involve index merges.

Simon Hørup Eskildsen

eBook: How to Create the Best Postgres Index for Your Queries — Learn how to create the best Postgres index for your queries. We provide a deep dive into index types, operators, data types and more. Creating the right indexes can often improve your query performance by 10x or even 100x.

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Percentage Calculations Using Window Functions — Rather than fetching your data and then performing percentage calculations upon it, why not do it all in a single query? A perfect use case for window functions, says Paul, who gives a practical example, plus a link to an interactive sandbox where you can play for yourself.

Paul Ramsey

How Fly.io Runs Its New Postgres Platform — We’re big fans of Fly (a sort of broadly distributed, modern Heroku-a-like) so it’s been fun seeing them build out their platform. Running Postgres is pretty easy, but the trick is in managing replicas, failover, etc. and Fly uses entirely open-source pieces to make it all work.

Nicoll and Davis (Fly)

AWS Database Migration Service Adds Managed Schema Migration — AWS Database Migration Service (DMS) is a long standing service for migrating databases (particularly those running on Oracle or SQL Server) to AWS. At this week’s re:Invent, AWS unveiled a new automatic database schema converter as an integral part of the service. It supports migrations from SQL Server 2008+ and Oracle 10.2+, 11g-12.2, 18c, and 19c to MySQL or Postgres running on RDS.

Channy Yun (AWS)

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Using Postgres as a Task Queue for Rowdy Gophers — A developer walks through his experience of building a fast and efficient queuing system on top of Postgres for his Go routines to use for dividing up work.

Manav at Ente

Create D2 ERD Diagrams from Postgres Schemas — A simple Node script that can turn the schema of a Postgres database into an elegant diagram using the D2 declarative diagramming DSL. (Also of interest is the mega SQL query this script relies on for fetching a schema in one go.)

Zeke Nierenberg

pgvector: Vector Similarity Search Extension — Supports L2 distance, inner product, and cosine distance. There’s a whole suite of client libraries for Node, Go, Ruby, PHP, Rust, and more, too.

pgvector