DBMS > Hawkular Metrics vs. PostgreSQL vs. RDF4J
System Properties Comparison Hawkular Metrics vs. PostgreSQL vs. RDF4J
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|Editorial information provided by DB-Engines|
|Name||Hawkular Metrics Xexclude from comparison||PostgreSQL Xexclude from comparison||RDF4J formerly known as Sesame Xexclude from comparison|
|Description||Hawkular metrics is the metric storage of the Red Hat sponsored Hawkular monitoring system. It is based on Cassandra.||Widely used open source RDBMS Developed as objectoriented DBMS (Postgres), gradually enhanced with 'standards' like SQL||RDF4J is a Java framework for processing RDF data, supporting both memory-based and a disk-based storage.|
|Primary database model||Time Series DBMS||Relational DBMS with object oriented extensions, e.g.: user defined types/functions and inheritance. Handling of key/value pairs with hstore module.||RDF store|
|Secondary database models||Document store|
Graph DBMS with Apache Age
|Developer||Community supported by Red Hat||PostgreSQL Global Development Group www.postgresql.org/developer||Since 2016 officially forked into an Eclipse project, former developer was Aduna Software.|
|Initial release||2014||1989 1989: Postgres, 1996: PostgreSQL||2004|
|Current release||15.3, May 2023|
|License Commercial or Open Source||Open Source Apache 2.0||Open Source BSD||Open Source Eclipse Distribution License (EDL), v1.0.|
|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||schema-free||yes||yes RDF Schemas|
|Typing predefined data types such as float or date||yes||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.|
|SQL Support of SQL||no||yes standard with numerous extensions||no|
|APIs and other access methods||HTTP REST||ADO.NET|
native C library
streaming API for large objects
RIO RDF Input/Output
SeRQL Sesame RDF Query Language
Sesame REST HTTP Protocol
|Supported programming languages||Go|
|Server-side scripts Stored procedures||no||user defined functions realized in proprietary language PL/pgSQL or with common languages like Perl, Python, Tcl etc.||yes|
|Triggers||yes via Hawkular Alerting||yes||yes|
|Partitioning methods Methods for storing different data on different nodes||Sharding based on Cassandra||partitioning by range, list and (since PostgreSQL 11) by hash||none|
|Replication methods Methods for redundantly storing data on multiple nodes||selectable replication factor based on Cassandra||Source-replica replication other methods possible by using 3rd party extensions||none|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Eventual Consistency based on Cassandra|
Immediate Consistency based on Cassandra
|Foreign keys Referential integrity||no||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||no||ACID||ACID Isolation support depends on the API used|
|Concurrency Support for concurrent manipulation of data||yes||yes||yes|
|Durability Support for making data persistent||yes||yes||yes in-memory storage is supported as well|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||no||no|
|User concepts Access control||no||fine grained access rights according to SQL-standard||no|
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|Hawkular Metrics||PostgreSQL||RDF4J formerly known as Sesame|
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