DBMS > Datomic vs. HarperDB vs. Kingbase
System Properties Comparison Datomic vs. HarperDB vs. Kingbase
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|Editorial information provided by DB-Engines|
|Name||Datomic Xexclude from comparison||HarperDB Xexclude from comparison||Kingbase Xexclude from comparison|
|Description||Datomic builds on immutable values, supports point-in-time queries and uses 3rd party systems for durability||Ultra-low latency distributed database with an intuitive REST API supporting NoSQL and SQL (including joins). Deployment of functions and databases simultaneously with a consolidated node-level architecture.||An enterprise-class RDBMS compatible with PostgreSQL and Oracle and widely used in China.|
|Primary database model||Relational DBMS||Document store||Relational DBMS|
|Secondary database models||Document store|
|Developer||Cognitect||HarperDB||BeiJing KINGBASE Information technologies inc.|
|Current release||1.0.6362, January 2022||3.1, August 2021||V8.0, August 2021|
|License Commercial or Open Source||commercial limited edition free||commercial free community edition available||commercial|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Implementation language||Java, Clojure||Node.js||C and Java|
|Server operating systems||All OS with a Java VM||Linux|
|Data scheme||yes||dynamic schema||yes|
|Typing predefined data types such as float or date||yes||yes JSON data types||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||yes|
|SQL Support of SQL||no||SQL-like data manipulation statements||Standard with numerous extensions|
|APIs and other access methods||RESTful HTTP API||JDBC|
RESTful HTTP/JSON API
|Supported programming languages||Clojure|
|Server-side scripts Stored procedures||yes Transaction Functions||Custom Functions since release 3.1||user defined functions|
|Triggers||By using transaction functions||no||yes|
|Partitioning methods Methods for storing different data on different nodes||none But extensive use of caching in the application peers||A table resides as a whole on one (or more) nodes in a cluster||horizontal partitioning (by range, list and hash) and vertical partitioning|
|Replication methods Methods for redundantly storing data on multiple nodes||none But extensive use of caching in the application peers||yes the nodes on which a table resides can be defined||yes|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||no||no||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||ACID||Atomic execution of specific operations||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes||yes|
|Durability Support for making data persistent||yes using external storage systems (e.g. Cassandra, DynamoDB, PostgreSQL, Couchbase and others)||yes, using LMDB||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||yes|
|User concepts Access control||no||Access rights for users and roles||fine grained access rights according to SQL-standard|
|More information provided by the system vendor|
|Specific characteristics||HarperDB is the first distributed database with hybrid SQL & NoSQL functionality...|
|An enterprise-class RDBMS compatible with PostgreSQL and Oracle. It has the following...|
|Competitive advantages||By combining the functionality of the best SQL, NoSQL, and NewSQL products on the...|
|Complete database management platform with Integrated Development Environment Tool,...|
|Typical application scenarios||Use cases where HarperDB is a better fit than other solutions include: Rapid app...|
|New applications for transactional and mixed workloads that need to integrate with...|
|Key customers||A few highlighted customers include: US Army, US Airforce, Chelan PUD, TATA, & Lumen....|
|The main customers are: China National Petroleum Corporation China Petrochemical...|
|Market metrics||Over 94K total HarperDB users : 16,500+ npm downloads 73,600+ on Docker Hub 4,200+...|
|At present, the main market is in China, but expansion to the international market...|
|Licensing and pricing models||HarperDB follows a freemium/premium model . A data base is only as powerful as it...|
|Business license. Various sales modes: for example, sales by set, sales by CPU quantity,...|
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