DBMS > EJDB vs. EXASOL vs. Firebase Realtime Database vs. SiteWhere

System Properties Comparison EJDB vs. EXASOL vs. Firebase Realtime Database vs. SiteWhere

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Editorial information provided by DB-Engines
Name	EJDB  Xexclude from comparison	EXASOL  Xexclude from comparison	Firebase Realtime Database  Xexclude from comparison	SiteWhere  Xexclude from comparison
Description	Embeddable document-store database library with JSON representation of queries (in MongoDB style)	High-performance, in-memory, MPP database specifically designed for in-memory analytics.	Cloud-hosted realtime document store. iOS, Android, and JavaScript clients share one Realtime Database instance and automatically receive updates with the newest data.	M2M integration platform for persisting/querying time series data
Primary database model	Document store	Relational DBMS	Document store	Time Series DBMS
DB-Engines Ranking measures the popularity of database management systems Trend Chart	Score 0.09 Rank #319   Overall #42   Document stores	Score 2.98 Rank #103   Overall #53   Relational DBMS	Score 18.34 Rank #39   Overall #6   Document stores	Score 0.00 Rank #356   Overall #32   Time Series DBMS
Website	ejdb.org	www.exasol.com	firebase.google.com/­products/­realtime-database	sitewhere.io
Technical documentation	github.com/­Softmotions/­ejdb/­blob/­master/­README.md	www.exasol.com/­resources	firebase.google.com/­docs/­database	sitewhere.io/­docs/­2.1.0
Developer	Softmotions	Exasol	Google acquired by Google 2014	SiteWhere
Initial release	2012	2000	2012	2010
License Commercial or Open Source	Open Source GPLv2	commercial	commercial	Open Source Common Public Attribution License Version 1.0
Cloud-based only Only available as a cloud service	no	no	yes	no
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Implementation language	C			Java
Server operating systems	server-less		hosted	Linux OS X Windows
Data scheme	schema-free	yes	schema-free	predefined scheme
Typing predefined data types such as float or date	yes string, integer, double, bool, date, object_id	yes	yes	yes
XML support Some form of processing data in XML format, e.g. support for XML data structures, and/or support for XPath, XQuery or XSLT.		no	no	no
Secondary indexes	no	yes	yes	no
SQL Support of SQL	no	yes	no	no
APIs and other access methods	in-process shared library	.Net JDBC ODBC WebSocket	Android iOS JavaScript API RESTful HTTP API	HTTP REST
Supported programming languages	Actionscript C C# C++ Go Java JavaScript (Node.js) Lua Objective-C Pike Python Ruby	Java Lua Python R	Java JavaScript Objective-C
Server-side scripts Stored procedures	no	user defined functions	limited functionality with using 'rules'
Triggers	no	yes	Callbacks are triggered when data changes
Partitioning methods Methods for storing different data on different nodes	none	Sharding		Sharding based on HBase
Replication methods Methods for redundantly storing data on multiple nodes	none			selectable replication factor based on HBase
MapReduce Offers an API for user-defined Map/Reduce methods	no	yes Hadoop integration	no	no
Consistency concepts Methods to ensure consistency in a distributed system		Immediate Consistency	Eventual Consistency if the client is offline Immediate Consistency if the client is online	Immediate Consistency
Foreign keys Referential integrity	no typically not needed, however similar functionality with collection joins possible	yes	no	no
Transaction concepts Support to ensure data integrity after non-atomic manipulations of data	no	ACID	yes	no
Concurrency Support for concurrent manipulation of data	yes Read/Write Locking	yes	yes	yes
Durability Support for making data persistent	yes	yes	yes	yes
In-memory capabilities Is there an option to define some or all structures to be held in-memory only.		yes		no
User concepts Access control	no	Access rights for users, groups and roles according to SQL-standard	yes, based on authentication and database rules	Users with fine-grained authorization concept
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	EJDB	EXASOL	Firebase Realtime Database	SiteWhere
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