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DBMS > CockroachDB vs. LokiJS vs. OpenMLDB vs. OpenQM

System Properties Comparison CockroachDB vs. LokiJS vs. OpenMLDB vs. OpenQM

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Editorial information provided by DB-Engines
NameCockroachDB  Xexclude from comparisonLokiJS  Xexclude from comparisonOpenMLDB  Xexclude from comparisonOpenQM infoalso called QM  Xexclude from comparison
DescriptionCockroachDB is a distributed database architected for modern cloud applications. It is wire compatible with PostgreSQL and backed by a Key-Value Store, which is either RocksDB or a purpose-built derivative, called Pebble.In-memory JavaScript DBMSAn open-source machine learning database that provides a feature platform for training and inferenceQpenQM is a high-performance, self-tuning, multi-value DBMS
Primary database modelRelational DBMSDocument storeTime Series DBMSMultivalue DBMS
Secondary database modelsRelational DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score4.74
Rank#67  Overall
#36  Relational DBMS
Score0.44
Rank#256  Overall
#40  Document stores
Score0.11
Rank#339  Overall
#30  Time Series DBMS
Score0.28
Rank#291  Overall
#10  Multivalue DBMS
Websitewww.cockroachlabs.comgithub.com/­techfort/­LokiJSopenmldb.aiwww.rocketsoftware.com/­products/­rocket-multivalue-application-development-platform/­rocket-open-qm
Technical documentationwww.cockroachlabs.com/­docstechfort.github.io/­LokiJSopenmldb.ai/­docs/­zh/­main
DeveloperCockroach Labs4 Paradigm Inc.Rocket Software, originally Martin Phillips
Initial release2015201420201993
Current release24.1.0, May 20242024-2 February 20243.4-12
License infoCommercial or Open SourceOpen Source infoApache 2.0, commercial license availableOpen SourceOpen SourceOpen Source infoGPLv2, extended commercial license available
Cloud-based only infoOnly available as a cloud servicenononono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageGoJavaScriptC++, Java, Scala
Server operating systemsLinux
macOS
Windows
server-less, requires a JavaScript environment (browser, Node.js)LinuxAIX
FreeBSD
Linux
macOS
Raspberry Pi
Solaris
Windows
Data schemedynamic schemaschema-freeFixed schemayes infowith some exceptions
Typing infopredefined data types such as float or dateyesnoyes
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.nononoyes
Secondary indexesyesyes infovia viewsyesyes
SQL infoSupport of SQLyes, wire compatible with PostgreSQLnoyesno
APIs and other access methodsJDBCJavaScript APIJDBC
SQLAlchemy
Supported programming languagesC#
C++
Clojure
Go
Java
JavaScript (Node.js)
PHP
Python
Ruby
Rust
JavaScriptC++
Go
Java
Python
Scala
.Net
Basic
C
Java
Objective C
PHP
Python
Server-side scripts infoStored proceduresnoView functions in JavaScriptnoyes
Triggersnoyesnoyes
Partitioning methods infoMethods for storing different data on different nodeshorizontal partitioning (by key range) infoall tables are translated to an ordered KV store and then broken down into 64MB ranges, which are then used as replicas in RAFTnonehorizontal partitioningyes
Replication methods infoMethods for redundantly storing data on multiple nodesMulti-source replication using RAFTnoneSource-replica replicationyes
MapReduce infoOffers an API for user-defined Map/Reduce methodsnoyesno
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate ConsistencynoneImmediate ConsistencyImmediate Consistency
Foreign keys infoReferential integrityyesnonono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDno infoatomic operations within a single collection possiblenoACID
Concurrency infoSupport for concurrent manipulation of datayesyesyes
Durability infoSupport for making data persistentyesyes infoSerialization of a DB in a Node.JS/Cordova/PhoneGap environment. Usage of the IndexedDB-API in a browser.yesyes
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.noyesyes
User concepts infoAccess controlRole-based access controlnofine grained access rights according to SQL-standardAccess rights can be defined down to the item level

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More resources
CockroachDBLokiJSOpenMLDBOpenQM infoalso called QM
DB-Engines blog posts

New kids on the block: database management systems implemented in JavaScript
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