relaxo-query-server
crux
relaxo-query-server | crux | |
---|---|---|
1 | 16 | |
5 | 1,475 | |
- | - | |
0.0 | 9.7 | |
about 6 years ago | over 2 years ago | |
Ruby | Clojure | |
- | MIT License |
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relaxo-query-server
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Git as a NoSql Database
Yes, it was. It was originally a front end and back end (query server) for CouchDB. But CouchDB 2 really went in a different direction to what I expected with query servers so I gave up and decided to pivot in a different direction with the code base.
https://github.com/ioquatix/relaxo-query-server FYI.
crux
- Speeding Up `Atan2f` by 50x
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Bridging the Blockchain / Database Divide (Temporal Graph Queries for Corda)
Hi, a couple of my colleagues spent some time working on this integration with our open source database product (https://opencrux.com), and I'm curious to know - has anyone done similar things to connect Corda with a secondary off-the-shelf query engine?
- Crux 1.18.0 Is Out
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Crux 1.18.0 is out!
For more details, see the release notes.
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Looking for Intermediate & Advanced SQL Users for Research
The context is that I work on on https://opencrux.com, which offers a bi-temporal Datalog query layer (as well as SQL) that more or less addresses the intersection of the two, since Datalog is great for expressing recursive queries.
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How to query Datomic, Datascript, Asami, or other graph databases
I suppose another somewhat important distinction, once again performance related, is that graph databases will typically track index statistics to aid with query planning. For example, Crux uses stored knowledge of attribute-value cardinalities (recently via HyperLogLog) to optimise the join order of a query - this can make a big difference when attempting to traverse large graphs efficiently.
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Free project to practice sql ?
Agreed, recursive querying & bitemporal modelling in SQL are non-trivial problems, and the combination of the two is harder still. For an alternative perspective on tackling such problems I'd suggest looking at Datalog, which makes recursion a breeze, and a database with first-class bitemporality - both of which feature in https://opencrux.com (which I happen to work on :))
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Ask HN: What under-the-radar technology are you super excited about?
I work on Crux so can share a few details about our implementation of Datalog. The query is compiled into a kind of Worst-Case Optimal Join algorithm [0] which means that certain types of queries (e.g. cyclic graph-analytical queries, like counting triangles) are generally more efficient than what is possible with a non-WCOJ query execution strategy. However, the potency of this approach relies on the query planner calculating a good ordering of variables for the join order, and this is a hard problem in itself.
Crux is usually very competent at selecting a sensible variable ordering but when it makes a bad choice your query will take an unnecessary performance hit. The workaround for these situations is to break your query into smaller queries (since we don't wish to support any kind of hinting). Over the longer term we will be continuing to build more intelligent heuristics that make use of advanced population statistics. For instance we are about to merge a PR that uses HyperLogLog to inform attribute selectivity: https://github.com/juxt/crux/pull/1472
[0] https://cs.stanford.edu/people/chrismre/papers/paper49.Ngo.p...
- Bitemporal History
- Git as a NoSql Database
What are some alternatives?
time - A simplified approach to working with dates, times, and time zones.
xtdb - An immutable database for application development and time-travel data compliance, with SQL and XTQL. Developed by @juxt
cl-git - A Common Lisp implementation of parsers for the git object file formats
asami - A graph store for Clojure and ClojureScript
specter - Clojure(Script)'s missing piece
materialize - The data warehouse for operational workloads.
mergestat-lite - Query git repositories with SQL. Generate reports, perform status checks, analyze codebases. 🔍 📊
mnm - mnm implements TMTP protocol. Let Internet sites message members directly, instead of unreliable, insecure email. Contributors welcome! (Server)
dolt - Dolt – Git for Data
xforms - Extra transducers and reducing fns for Clojure(script)
clojure-graph-resources - A curated list of Clojure resources for dealing with graph-like data.
Fable: F# |> BABEL - F# to JavaScript, TypeScript, Python, Rust and Dart Compiler