Kolmos
One database engine for MongoDB, PostgreSQL & MySQL
What it does
Kolmos is an explanation-first database engine written in Rust that unifies MongoDB (:27018), PostgreSQL (:5433), and MySQL (:3306) wire protocols. It delivers zero-RAM-bloat secondary indexing with 1.6x–2.1x better columnar compression than Parquet-zstd, storing directly to Cloudflare R2 at 90% lower cloud storage cost.
Kolmos is a unified cloud database engine engineered for PostgreSQL, MySQL, and MongoDB workloads. It features self-compressing columnar storage, multi-wire protocol compatibility, and zero-egress object storage economics.
KOLMOS is a cloud database engine built for PostgreSQL, MySQL, and MongoDB workloads. It combines self-compressing storage, columnar architecture, and multi-wire compatibility to reduce database storage and cloud infrastructure costs. Cloud databases can become expensive as storage, replication, I/O, and backups grow. KOLMOS uses a self-compressing storage engine and cloud object storage to reduce the physical footprint of PostgreSQL, MySQL, and MongoDB workloads. Mathematical MDL formula mining packs data denser than standard Parquet-zstd. Direct R2 integration completely eliminates predatory cloud egress and IOPS tax. Native wire protocol compatibility for PostgreSQL, MySQL, and MongoDB…from kolmos.dev
Does the same job
all alternatives →- PSPgDog – Shard Postgres without extensions2025 · github.com · ▲307
Hey HN! Lev here, author of PgDog (https://github.com/pgdogdev/pgdog). I’m scaling our favorite database, PostgreSQL. PgDog is a new open source proxy, written in Rust, with first-class support for sharding — without changes to your app or needing database extensions. Here’s a walkthrough of how it works: https://www.youtube.com/watch?v=y6sebczWZ-c Running Postgres at scale is hard. Eventually, one primary isn’t enough at which point you need to split it up. Since there is currently no good tooling out there to do this, teams end up breaking their apps…
- PJPostgres.js – Fastest Full-Featured PostgreSQL Client for Node and Deno2022 · github.com · ▲257
- TSToroDB Stampede: Automagical MongoDB to PostgreSQL, 100x Faster Queries2016 · torodb.com · ▲43
- BABedquiltDB – A Mongo-like JSON doc store built on Postgres2016 · bedquiltdb.github.io · ▲145
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