DBMS > HarperDB vs. PostgreSQL vs. TDengine
System Properties Comparison HarperDB vs. PostgreSQL vs. TDengine
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|Editorial information provided by DB-Engines|
|Name||HarperDB Xexclude from comparison||PostgreSQL Xexclude from comparison||TDengine 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.||Widely used open source RDBMS Developed as objectoriented DBMS (Postgres), gradually enhanced with 'standards' like SQL||Time Series DBMS and big data platform|
|Primary database model||Document store||Relational DBMS with object oriented extensions, e.g.: user defined types/functions and inheritance. Handling of key/value pairs with hstore module.||Time Series DBMS|
|Secondary database models||Document store|
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|Developer||HarperDB||PostgreSQL Global Development Group www.postgresql.org/developer||TDEngine, previously Taos Data|
|Initial release||2017||1989 1989: Postgres, 1996: PostgreSQL||2019|
|Current release||3.1, August 2021||15.3, May 2023||3.0, August 2022|
|License Commercial or Open Source||commercial free community edition available||Open Source BSD||Open Source GPL V3, also commercial editions available|
|Cloud-based only Only available as a cloud service||no||no||no|
|DBaaS offerings (sponsored links) Database as a Service|
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|Server operating systems||Linux|
|Data scheme||dynamic schema||yes||yes|
|Typing predefined data types such as float or date||yes JSON data types||yes||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||yes specific XML-type available, but no XML query functionality.||no|
|SQL Support of SQL||SQL-like data manipulation statements||yes standard with numerous extensions||Standard SQL with extensions for time-series applications|
|APIs and other access methods||JDBC|
RESTful HTTP/JSON API
native C library
streaming API for large objects
RESTful HTTP API
|Supported programming languages||.Net|
|Server-side scripts Stored procedures||Custom Functions since release 3.1||user defined functions realized in proprietary language PL/pgSQL or with common languages like Perl, Python, Tcl etc.||no|
|Triggers||no||yes||yes, via alarm monitoring|
|Partitioning methods Methods for storing different data on different nodes||A table resides as a whole on one (or more) nodes in a cluster||partitioning by range, list and (since PostgreSQL 11) by hash||Sharding|
|Replication methods Methods for redundantly storing data on multiple nodes||yes the nodes on which a table resides can be defined||Source-replica replication other methods possible by using 3rd party extensions||yes|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||no||yes||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||yes|
|Durability Support for making data persistent||yes, using LMDB||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes||no|
|User concepts Access control||Access rights for users and roles||fine grained access rights according to SQL-standard||yes|
|More information provided by the system vendor|
|Specific characteristics||TDengine™ is an open-source, cloud-native time-series database (TSDB) optimized for...|
|Competitive advantages||High performance: TDengine is the only time-series database that solves the high-cardinality...|
|Typical application scenarios||Internet of Things (IoT) Industrial Internet (IIoT) Connected Cars DevOps Energy...|
|Market metrics||TDengine has garnered over 20,000 stars on GitHub and is used in over 50 countries...|
|Licensing and pricing models||TDengine Community Edition is open-source software released under the AGPL 3.0 that...|
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We invite representatives of system vendors to contact us for updating and extending the system information,
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