DBMS > EJDB vs. H2
System Properties Comparison EJDB vs. H2
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|Editorial information provided by DB-Engines|
|Name||EJDB Xexclude from comparison||H2 Xexclude from comparison|
|Description||Embeddable document-store database library with JSON representation of queries (in MongoDB style)||Full-featured RDBMS with a small footprint, either embedded into a Java application or used as a database server.|
|Primary database model||Document store||Relational DBMS|
|Secondary database models||Spatial DBMS|
|Current release||2.1.214, June 2022|
|License Commercial or Open Source||Open Source GPLv2||Open Source dual-licence (Mozilla public license, Eclipse public license)|
|Cloud-based only Only available as a cloud service||no||no|
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|Server operating systems||server-less||All OS with a Java VM|
|Typing predefined data types such as float or date||yes string, integer, double, bool, date, object_id||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|
|SQL Support of SQL||no||yes|
|APIs and other access methods||in-process shared library||JDBC|
|Supported programming languages||Actionscript|
|Server-side scripts Stored procedures||no||Java Stored Procedures and User-Defined Functions|
|Partitioning methods Methods for storing different data on different nodes||none||none|
|Replication methods Methods for redundantly storing data on multiple nodes||none||With clustering: 2 database servers on different computers operate on identical copies of a database|
|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 typically not needed, however similar functionality with collection joins possible||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||no||ACID|
|Concurrency Support for concurrent manipulation of data||yes Read/Write Locking||yes, multi-version concurrency control (MVCC)|
|Durability Support for making data persistent||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes|
|User concepts Access control||no||fine grained access rights according to SQL-standard|
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