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DBMS > Kdb+ vs. RethinkDB vs. SwayDB vs. XTDB

System Properties Comparison Kdb+ vs. RethinkDB vs. SwayDB vs. XTDB

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Editorial information provided by DB-Engines
NameKdb+  Xexclude from comparisonRethinkDB  Xexclude from comparisonSwayDB  Xexclude from comparisonXTDB infoformerly named Crux  Xexclude from comparison
DescriptionHigh performance Time Series DBMSDBMS for the Web with a mechanism to push updated query results to applications in realtime.An embeddable, non-blocking, type-safe key-value store for single or multiple disks and in-memory storageA general purpose database with bitemporal SQL and Datalog and graph queries
Primary database modelTime Series DBMSDocument storeKey-value storeDocument store
Secondary database modelsRelational DBMSSpatial DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score8.98
Rank#54  Overall
#2  Time Series DBMS
Score3.09
Rank#99  Overall
#19  Document stores
Score0.02
Rank#341  Overall
#52  Key-value stores
Score0.00
Rank#354  Overall
#50  Document stores
Websitekx.comrethinkdb.comswaydb.iogithub.com/­xtdb/­xtdb
xtdb.com
Technical documentationcode.kx.comrethinkdb.com/­docsxtdb.com/­docs
DeveloperKx Systems, a division of First Derivatives plcThe Linux Foundation infosince July 2017Simer PlahaJuxt Ltd.
Initial release2000 infokdb was released 2000, kdb+ in 2003200920182019
Current release3.6, May 20182.4.1, August 20201.19, September 2021
License infoCommercial or Open Sourcecommercial infofree 32-bit versionOpen Source infoApache Version 2Open Source infoGNU Affero GPL V3.0Open Source infoMIT License
Cloud-based only infoOnly available as a cloud servicenononono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageqC++ScalaClojure
Server operating systemsLinux
OS X
Solaris
Windows
Linux
OS X
Windows
All OS with a Java 8 (and higher) VM
Linux
Data schemeyesschema-freeschema-freeschema-free
Typing infopredefined data types such as float or dateyesyes infostring, binary, float, bool, date, geometrynoyes, 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.yesnonono
Secondary indexesyes infotable attribute 'grouped'yesnoyes
SQL infoSupport of SQLSQL-like query language (q)nonolimited SQL, making use of Apache Calcite
APIs and other access methodsHTTP API
JDBC
Jupyter
Kafka
ODBC
WebSocket
HTTP REST
JDBC
Supported programming languagesC
C#
C++
Go
J
Java
JavaScript
Lua
MatLab
Perl
PHP
Python
R
Scala
C infocommunity-supported driver
C# infocommunity-supported driver
C++ infocommunity-supported driver
Clojure infocommunity-supported driver
Dart infocommunity-supported driver
Erlang infocommunity-supported driver
Go infocommunity-supported driver
Haskell infocommunity-supported driver
Java infoofficial driver
JavaScript (Node.js) infoofficial driver
Lisp infocommunity-supported driver
Lua infocommunity-supported driver
Objective-C infocommunity-supported driver
Perl infocommunity-supported driver
PHP infocommunity-supported driver
Python infoofficial driver
Ruby infoofficial driver
Scala infocommunity-supported driver
Java
Kotlin
Scala
Clojure
Java
Server-side scripts infoStored proceduresuser defined functionsnono
Triggersyes infowith viewsClient-side triggers through changefeedsnono
Partitioning methods infoMethods for storing different data on different nodeshorizontal partitioningSharding inforange basednonenone
Replication methods infoMethods for redundantly storing data on multiple nodesSource-replica replicationSource-replica replicationnoneyes, each node contains all data
MapReduce infoOffers an API for user-defined Map/Reduce methodsno infosimilar paradigm used for internal processingyesnono
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate ConsistencyImmediate ConsistencyImmediate Consistency
Foreign keys infoReferential integrityyesnonono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of datanoAtomic single-document operationsAtomic execution of operationsACID
Concurrency infoSupport for concurrent manipulation of datayesyes infoMVCC basedyesyes
Durability infoSupport for making data persistentyesyesyesyes, 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.yesnoyes
User concepts infoAccess controlrights management via user accountsyes infousers and table-level permissionsno

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More resources
Kdb+RethinkDBSwayDBXTDB infoformerly named Crux
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