DBMS > HarperDB vs. Quasardb
System Properties Comparison HarperDB vs. Quasardb
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|Editorial information provided by DB-Engines|
|Name||HarperDB Xexclude from comparison||Quasardb Xexclude from comparison|
|Description||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.||Distributed, high-performance timeseries database|
|Primary database model||Document store||Time Series DBMS|
|Current release||3.1, August 2021||3.13.3, April 2022|
|License Commercial or Open Source||commercial free community edition available||commercial Free community edition, Non-profit organizations and non-commercial usage are eligible for free licenses|
|Cloud-based only Only available as a cloud service||no||no|
|DBaaS offerings (sponsored links) Database as a Service|
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|Server operating systems||Linux|
|Data scheme||dynamic schema||schema-free|
|Typing predefined data types such as float or date||yes JSON data types||yes integer and binary|
|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|
|Secondary indexes||yes||yes with tags|
|SQL Support of SQL||SQL-like data manipulation statements||SQL-like query language|
|APIs and other access methods||JDBC|
RESTful HTTP/JSON API
|Supported programming languages||.Net|
|Server-side scripts Stored procedures||Custom Functions since release 3.1||no|
|Partitioning methods Methods for storing different data on different nodes||A table resides as a whole on one (or more) nodes in a cluster||Sharding consistent hashing|
|Replication methods Methods for redundantly storing data on multiple nodes||yes the nodes on which a table resides can be defined||Source-replica replication with selectable replication factor|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||with Hadoop integration|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||no||no|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||Atomic execution of specific operations||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes|
|Durability Support for making data persistent||yes, using LMDB||yes by using LevelDB|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes||yes Transient mode|
|User concepts Access control||Access rights for users and roles||Cryptographically strong user authentication and audit trail|
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