Items tagged postgresql in Jan, 2024
Filters: Year: 2024 × Month: Jan × postgresql × Sorted by date
pgroll (via) “Zero-downtime, reversible, schema migrations for Postgres”
I love this kind of thing. This one is has a really interesting design: you define your schema modifications (adding/dropping columns, creating tables etc) using a JSON DSL, then apply them using a Go binary.
When you apply a migration the tool first creates a brand new PostgreSQL schema (effectively a whole new database) which imitates your new schema design using PostgreSQL views. You can then point your applications that have been upgraded to the new schema at it, using the PostgreSQL search_path setting.
Old applications can continue talking to the previous schema design, giving you an opportunity to roll out a zero-downtime deployment of the new code.
Once your application has upgraded and the physical rows in the database have been transformed to the new schema you can run a --continue command to make the final destructive changes and drop the mechanism that simulates both schema designs at once. # 30th January 2024, 9:27 pm
GPT in 500 lines of SQL (via) Utterly brilliant piece of PostgreSQL hackery by Alex Bolenok, who implements a full GPT-2 style language model in SQL on top of pg_vector. The final inference query is 498 lines long! # 6th January 2024, 10:55 pm