{"repo":"replikativ/stratum","free":true,"listed":false,"github":"https://github.com/replikativ/stratum","clone":"git clone https://github.com/replikativ/stratum.git","description":"Versioned, fast and scalable columnar database.","language":"Clojure","stars":67,"topics":["analytics","clojure","database","datalog","java"],"license":"Apache-2.0","category":"databases-storage","readme_excerpt":"Stratum Stratum is in beta. Please provide feedback and report any issues you run into. SIMD-accelerated SQL engine for the JVM. Every table is a branchable, copy-on-write value. Stratum is a columnar analytics engine that combines the performance of fused SIMD execution with the semantics of immutable data. Tables are persistent values - fork one in O(1), modify it independently, persist snapshots to named branches, and time-travel to any previous commit. It's the same model as Clojure's persistent collections and git's object store, applied to analytical data. 30-Second Demo Start a PostgreSQL-compatible server and query CSV/Parquet files directly: Then connect with any PostgreSQL client: Performance Stratum's architecture - fused SIMD execution over copy-on-write columnar data - delivers strong analytical performance. Single-threaded comparison vs DuckDB v1.4.4 (JDBC in-process) on 10M rows, 8-core Intel Lunar Lake. Full results in doc/benchmarks.md. Summary (10M rows, single-threaded, best of array/index mode vs DuckDB 1T): Category Queries Stratum faster DuckDB faster ---------- --------- --------------- -------------- TPC-H / SSB 7 7 (1.2–4.0x) 0 H2O Group-By 10 9 (1.0–8.5x) 1 H2O Join 3 2 (1.1x) 1 ClickBench 22 15 (1.0–105x) 7 NYC Taxi 4 2 (1.0–1.4x) 2 Statistical 5 5 (1.1–2.4x) 0 Window 3 3 (1.3–2.1x) 0 Hash Join + TPC-DS 3 2 (1.3–2.1x) 1 DuckDB wins on sparse-selectivity filters, global COUNT(DISTINCT), and window-based top-N. Stratum wins on arithmetic-heavy aggrega","default_branch":null,"files":null,"tree":[],"storefront":"/r/replikativ","claimed":false,"request_supported":{"post":"https://gitbuyer.com/r/replikativ/stratum/request-supported","requests":0},"note":"indexed from public GitHub; nothing is for sale on this page. Clone it from GitHub. Paid listings live at /search."}