https://www.pistack.xyz/tags/datahike/ Recent content in Datahike on Pi Stack Hugo en-us Sun, 20 Sep 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-09-20-clojure-datalog-databases-xtdb-vs-datahike-vs-datalevin/ Sun, 20 Sep 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-09-20-clojure-datalog-databases-xtdb-vs-datahike-vs-datalevin/ <p>You have a Postgres instance, a growing pile of <code>JOIN</code> statements, and a nagging feeling that your schema was designed for a world with fewer relationships than the one you now live in. Datalog promises pattern matching over facts instead of ten-table joins — but the Clojure ecosystem offers three serious engines, and they are <strong>not</strong> interchangeable. XTDB rewrote itself into an immutable SQL database. Datahike kept the Datomic API and put your storage backend on a plug. Datalevin forked LMDB and made embedded Datalog genuinely fast.</p>