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DBMS > Datomic vs. EJDB vs. Firebase Realtime Database vs. HyperSQL vs. LokiJS

System Properties Comparison Datomic vs. EJDB vs. Firebase Realtime Database vs. HyperSQL vs. LokiJS

Editorial information provided by DB-Engines
NameDatomic  Xexclude from comparisonEJDB  Xexclude from comparisonFirebase Realtime Database  Xexclude from comparisonHyperSQL infoalso known as HSQLDB  Xexclude from comparisonLokiJS  Xexclude from comparison
DescriptionDatomic builds on immutable values, supports point-in-time queries and uses 3rd party systems for durabilityEmbeddable document-store database library with JSON representation of queries (in MongoDB style)Cloud-hosted realtime document store. iOS, Android, and JavaScript clients share one Realtime Database instance and automatically receive updates with the newest data.Multithreaded, transactional RDBMS written in Java infoalso known as HSQLDBIn-memory JavaScript DBMS
Primary database modelRelational DBMSDocument storeDocument storeRelational DBMSDocument store
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score1.76
Rank#145  Overall
#66  Relational DBMS
Score0.30
Rank#294  Overall
#44  Document stores
Score15.00
Rank#39  Overall
#6  Document stores
Score3.90
Rank#85  Overall
#46  Relational DBMS
Score0.48
Rank#262  Overall
#42  Document stores
Websitewww.datomic.comgithub.com/­Softmotions/­ejdbfirebase.google.com/­products/­realtime-databasehsqldb.orggithub.com/­techfort/­LokiJS
Technical documentationdocs.datomic.comgithub.com/­Softmotions/­ejdb/­blob/­master/­README.mdfirebase.google.com/­docs/­databasehsqldb.org/­web/­hsqlDocsFrame.htmltechfort.github.io/­LokiJS
DeveloperCognitectSoftmotionsGoogle infoacquired by Google 2014
Initial release20122012201220012014
Current release1.0.6735, June 20232.7.2, June 2023
License infoCommercial or Open Sourcecommercial infolimited edition freeOpen Source infoGPLv2commercialOpen Source infobased on BSD licenseOpen Source
Cloud-based only infoOnly available as a cloud servicenonoyesnono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageJava, ClojureCJavaJavaScript
Server operating systemsAll OS with a Java VMserver-lesshostedAll OS with a Java VM infoEmbedded (into Java applications) and Client-Server operating modesserver-less, requires a JavaScript environment (browser, Node.js)
Data schemeyesschema-freeschema-freeyesschema-free
Typing infopredefined data types such as float or dateyesyes infostring, integer, double, bool, date, object_idyesyesno
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.nononono
Secondary indexesyesnoyesyesyes infovia views
SQL infoSupport of SQLnononoyesno
APIs and other access methodsRESTful HTTP APIin-process shared libraryAndroid
iOS
JavaScript API
RESTful HTTP API
HTTP API infoJDBC via HTTP
JDBC
ODBC
JavaScript API
Supported programming languagesClojure
Java
Actionscript
C
C#
C++
Go
Java
JavaScript (Node.js)
Lua
Objective-C
Pike
Python
Ruby
Java
JavaScript
Objective-C
All languages supporting JDBC/ODBC
Java
JavaScript
Server-side scripts infoStored proceduresyes infoTransaction Functionsnolimited functionality with using 'rules'Java, SQLView functions in JavaScript
TriggersBy using transaction functionsnoCallbacks are triggered when data changesyesyes
Partitioning methods infoMethods for storing different data on different nodesnone infoBut extensive use of caching in the application peersnonenonenone
Replication methods infoMethods for redundantly storing data on multiple nodesnone infoBut extensive use of caching in the application peersnonenonenone
MapReduce infoOffers an API for user-defined Map/Reduce methodsnonononoyes
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate ConsistencyEventual Consistency infoif the client is offline
Immediate Consistency infoif the client is online
Immediate Consistencynone
Foreign keys infoReferential integritynono infotypically not needed, however similar functionality with collection joins possiblenoyesno
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDnoyesACIDno infoatomic operations within a single collection possible
Concurrency infoSupport for concurrent manipulation of datayesyes infoRead/Write Lockingyesyes
Durability infoSupport for making data persistentyes infousing external storage systems (e.g. Cassandra, DynamoDB, PostgreSQL, Couchbase and others)yesyesyesyes infoSerialization of a DB in a Node.JS/Cordova/PhoneGap environment. Usage of the IndexedDB-API in a browser.
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.yes inforecommended only for testing and developmentyesyes
User concepts infoAccess controlnonoyes, based on authentication and database rulesfine grained access rights according to SQL-standardno

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More resources
DatomicEJDBFirebase Realtime DatabaseHyperSQL infoalso known as HSQLDBLokiJS
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