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DBMS > SQL.JS vs. VelocityDB vs. XTDB

System Properties Comparison SQL.JS vs. VelocityDB vs. XTDB

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Editorial information provided by DB-Engines
NameSQL.JS  Xexclude from comparisonVelocityDB  Xexclude from comparisonXTDB infoformerly named Crux  Xexclude from comparison
DescriptionPort of SQLite to JavaScriptA .NET Object Database that can be embedded/distributed and extended to a graph data model (VelocityGraph)A general purpose database with bitemporal SQL and Datalog and graph queries
Primary database modelRelational DBMSGraph DBMS
Object oriented DBMS
Document store
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score0.53
Rank#252  Overall
#116  Relational DBMS
Score0.05
Rank#358  Overall
#36  Graph DBMS
#16  Object oriented DBMS
Score0.11
Rank#343  Overall
#46  Document stores
Websitesql.js.orgvelocitydb.comgithub.com/­xtdb/­xtdb
www.xtdb.com
Technical documentationsql.js.org/­documentation/­index.htmlvelocitydb.com/­UserGuidewww.xtdb.com/­docs
DeveloperAlon Zakai infoenhancements implemented by othersVelocityDB IncJuxt Ltd.
Initial release201220112019
Current release7.x1.19, September 2021
License infoCommercial or Open SourceOpen SourcecommercialOpen Source infoMIT License
Cloud-based only infoOnly available as a cloud servicenonono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageJavaScriptC#Clojure
Server operating systemsserver-less, requires a JavaScript environment (browser, Node.js)Any that supports .NETAll OS with a Java 8 (and higher) VM
Linux
Data schemeyesyesschema-free
Typing infopredefined data types such as float or dateyesyesyes, extensible-data-notation format
XML support infoSome form of processing data in XML format, e.g. support for XML data structures, and/or support for XPath, XQuery or XSLT.nonono
Secondary indexesyesyes
SQL infoSupport of SQLyes infoSQL-92 is not fully supportednolimited SQL, making use of Apache Calcite
APIs and other access methodsJavaScript API.NetHTTP REST
JDBC
Supported programming languagesJavaScript.NetClojure
Java
Server-side scripts infoStored proceduresnonono
TriggersnoCallbacks are triggered when data changesno
Partitioning methods infoMethods for storing different data on different nodesnoneShardingnone
Replication methods infoMethods for redundantly storing data on multiple nodesnoneyes, each node contains all data
MapReduce infoOffers an API for user-defined Map/Reduce methodsnonono
Consistency concepts infoMethods to ensure consistency in a distributed systemnoneImmediate Consistency
Foreign keys infoReferential integrityyesnono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDACIDACID
Concurrency infoSupport for concurrent manipulation of datayesyes
Durability infoSupport for making data persistentno infoexcept by serializing a db to a fileyesyes, flexibel persistency by using storage technologies like Apache Kafka, RocksDB or LMDB
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.yesyes
User concepts infoAccess controlnoBased on Windows Authentication

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More resources
SQL.JSVelocityDBXTDB infoformerly named Crux
DB-Engines blog posts

New kids on the block: database management systems implemented in JavaScript
1 December 2014, Matthias Gelbmann

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