DBMS > Datomic vs. Firebase Realtime Database
System Properties Comparison Datomic vs. Firebase Realtime Database
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|Editorial information provided by DB-Engines|
|Name||Datomic Xexclude from comparison||Firebase Realtime Database Xexclude from comparison|
|Primary database model||Relational DBMS||Document store|
|Developer||Cognitect||Google acquired by Google 2014|
|License Commercial or Open Source||commercial limited edition free||commercial|
|Cloud-based only Only available as a cloud service||no||yes|
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|Implementation language||Java, Clojure|
|Server operating systems||All OS with a Java VM||hosted|
|Typing predefined data types such as float or date||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|
|SQL Support of SQL||no||no|
|APIs and other access methods||RESTful HTTP API||Android|
RESTful HTTP API
|Supported programming languages||Clojure|
|Server-side scripts Stored procedures||yes Transaction Functions||limited functionality with using 'rules'|
|Triggers||By using transaction functions||Callbacks are triggered when data changes|
|Partitioning methods Methods for storing different data on different nodes||none But extensive use of caching in the application peers|
|Replication methods Methods for redundantly storing data on multiple nodes||none But extensive use of caching in the application peers|
|MapReduce Offers an API for user-defined Map/Reduce methods||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
|Foreign keys Referential integrity||no||no|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||ACID||yes|
|Concurrency Support for concurrent manipulation of data||yes||yes|
|Durability Support for making data persistent||yes using external storage systems (e.g. Cassandra, DynamoDB, PostgreSQL, Couchbase and others)||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes recommended only for testing and development|
|User concepts Access control||no||yes, based on authentication and database rules|
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|Datomic||Firebase Realtime Database|
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