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XTDB, which is mentioned in the post, is subtly different from the other Clojure-based Datalog systems in this respect, because its Datalog engine executes in t
by refset 4y ago
XTDB, which is mentioned in the post, is subtly different from the other Clojure-based Datalog systems in this respect, because its Datalog engine executes in terms of multi-way joins using a "Worst-Case Optimal Join" implementation that is ideal for graph processing (vs. a tree of binary hash joins). Therefore, based on statistics and query planning heuristics, it will often perform graph pattern matching before resolving the logic/horn clauses. (source: I work on the XTDB team)
- eternalban 4y agoInteresting architecture: https://raw.githubusercontent.com/xtdb/xtdb/master/docs/concepts/modules/ROOT/images/xtdb-node-1.svg https://raw.githubusercontent.com/xtdb/xtdb/master/docs/conc... Btw, is that 'RocksDB or ?' for the local store current or other storage engines can get plugged in? p.s. this is datomic's architecture for comparison. https://docs.datomic.com/on-prem/images/clientarch_orig.svg https://docs.datomic.com/on-prem/images/clientarch_orig.svg
- refset 4y agoHmm, it seems there's some SVG rendering issue when viewing directly. It should say "LMDB" in that empty spot. It renders okay for me on the GitHub readme: https://github.com/xtdb/xtdb https://github.com/xtdb/xtdb (and here https://docs.xtdb.com/concepts/what-is-xtdb/ https://docs.xtdb.com/concepts/what-is-xtdb/)