DBMS > EJDB vs. etcd vs. Microsoft Azure Cosmos DB
System Properties Comparison EJDB vs. etcd vs. Microsoft Azure Cosmos DB
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|Editorial information provided by DB-Engines|
|Name||EJDB Xexclude from comparison||etcd Xexclude from comparison||Microsoft Azure Cosmos DB former name was Azure DocumentDB Xexclude from comparison|
|Description||Embeddable document-store database library with JSON representation of queries (in MongoDB style)||A distributed reliable key-value store||Globally distributed, horizontally scalable, multi-model database service|
|Primary database model||Document store||Key-value store||Document store|
Wide column store
|Secondary database models||Spatial DBMS|
|Current release||3.4, August 2019|
|License Commercial or Open Source||Open Source GPLv2||Open Source Apache Version 2.0||commercial|
|Cloud-based only Only available as a cloud service||no||no||yes|
|DBaaS offerings (sponsored links) Database as a Service|
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|Server operating systems||server-less||FreeBSD|
|Typing predefined data types such as float or date||yes string, integer, double, bool, date, object_id||no||yes JSON types|
|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|
|Secondary indexes||no||no||yes All properties auto-indexed by default|
|SQL Support of SQL||no||no||SQL-like query language|
|APIs and other access methods||in-process shared library||gRPC|
JSON over HTTP
Graph API (Gremlin)
RESTful HTTP API
|Supported programming languages||Actionscript|
MongoDB client drivers written for various programming languages
|Partitioning methods Methods for storing different data on different nodes||none||Sharding Implicit feature of the cloud service|
|Replication methods Methods for redundantly storing data on multiple nodes||none||Using Raft consensus algorithm to ensure data replication with strong consistency among multiple replicas.||yes Implicit feature of the cloud service|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no||with Hadoop integration Integration with Hadoop/HDInsight on Azure*|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Bounded Staleness|
Immediate Consistency Consistency level configurable on request level
|Foreign keys Referential integrity||no typically not needed, however similar functionality with collection joins possible||no||no|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||no||no||Multi-item ACID transactions with snapshot isolation within a partition|
|Concurrency Support for concurrent manipulation of data||yes Read/Write Locking||yes||yes|
|Durability Support for making data persistent||yes||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||no|
|User concepts Access control||no||no||Access rights can be defined down to the item level|
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|Related products and services|
|3rd parties||CData: Connect to Big Data & NoSQL through standard Drivers.|
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|EJDB||etcd||Microsoft Azure Cosmos DB former name was Azure DocumentDB|
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