DBMS > Datomic vs. EJDB
System Properties Comparison Datomic vs. EJDB
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|Editorial information provided by DB-Engines|
|Name||Datomic Xexclude from comparison||EJDB Xexclude from comparison|
|Description||Datomic builds on immutable values, supports point-in-time queries and uses 3rd party systems for durability||Embeddable document-store database library with JSON representation of queries (in MongoDB style)|
|Primary database model||Relational DBMS||Document store|
|Current release||1.0.6735, June 2023|
|License Commercial or Open Source||commercial limited edition free||Open Source GPLv2|
|Cloud-based only Only available as a cloud service||no||no|
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|Implementation language||Java, Clojure||C|
|Server operating systems||All OS with a Java VM||server-less|
|Typing predefined data types such as float or date||yes||yes string, integer, double, bool, date, object_id|
|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|
|SQL Support of SQL||no||no|
|APIs and other access methods||RESTful HTTP API||in-process shared library|
|Supported programming languages||Clojure|
|Server-side scripts Stored procedures||yes Transaction Functions||no|
|Triggers||By using transaction functions||no|
|Partitioning methods Methods for storing different data on different nodes||none But extensive use of caching in the application peers||none|
|Replication methods Methods for redundantly storing data on multiple nodes||none But extensive use of caching in the application peers||none|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency|
|Foreign keys Referential integrity||no||no typically not needed, however similar functionality with collection joins possible|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||ACID||no|
|Concurrency Support for concurrent manipulation of data||yes||yes Read/Write Locking|
|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||no|
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