DBMS > Alibaba Cloud AnalyticDB for PostgreSQL vs. EJDB vs. Hawkular Metrics vs. Transwarp StellarDB vs. VelocityDB

System Properties Comparison Alibaba Cloud AnalyticDB for PostgreSQL vs. EJDB vs. Hawkular Metrics vs. Transwarp StellarDB vs. VelocityDB

Editorial information provided by DB-Engines
Name	Alibaba Cloud AnalyticDB for PostgreSQL former name was HybridDB  Xexclude from comparison	EJDB  Xexclude from comparison	Hawkular Metrics  Xexclude from comparison	Transwarp StellarDB  Xexclude from comparison	VelocityDB  Xexclude from comparison
Description	An online MPP (Massively Parallel Processing) data warehousing service based on Greenplum	Embeddable document-store database library with JSON representation of queries (in MongoDB style)	Hawkular metrics is the metric storage of the Red Hat sponsored Hawkular monitoring system. It is based on Cassandra.	A distributed graph DBMS built for enterprise-level graph applications	A .NET Object Database that can be embedded/distributed and extended to a graph data model (VelocityGraph)
Primary database model	Relational DBMS	Document store	Time Series DBMS	Graph DBMS	Graph DBMS Object oriented DBMS
DB-Engines Ranking measures the popularity of database management systems Trend Chart	Score 0.76 Rank #220   Overall #102   Relational DBMS	Score 0.31 Rank #296   Overall #44   Document stores	Score 0.08 Rank #366   Overall #39   Time Series DBMS	Score 0.07 Rank #371   Overall #39   Graph DBMS	Score 0.11 Rank #354   Overall #37   Graph DBMS #15   Object oriented DBMS
Website	www.alibabacloud.com/­product/­hybriddb-postgresql	github.com/­Softmotions/­ejdb	www.hawkular.org	www.transwarp.cn/­en/­product/­stellardb	velocitydb.com
Technical documentation	www.alibabacloud.com/­help/­en/­analyticdb-for-postgresql/­latest/­product-introduction-overview	github.com/­Softmotions/­ejdb/­blob/­master/­README.md	www.hawkular.org/­hawkular-metrics/­docs/­user-guide		velocitydb.com/­UserGuide
Developer	Alibaba / Pivotal Software Inc. / PostgreSQL Global Development Group	Softmotions	Community supported by Red Hat	Transwarp	VelocityDB Inc
Initial release	2016	2012	2014		2011
Current release					7.x
License Commercial or Open Source	commercial	Open Source GPLv2	Open Source Apache 2.0	commercial	commercial
Cloud-based only Only available as a cloud service	yes	no	no	no	no
DBaaS offerings (sponsored links) Database as a Service Providers of DBaaS offerings, please contact us to be listed.
Implementation language		C	Java		C#
Server operating systems	hosted	server-less	Linux OS X Windows		Any that supports .NET
Data scheme	yes	schema-free	schema-free		yes
Typing predefined data types such as float or date	yes	yes string, integer, double, bool, date, object_id	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.	yes		no		no
Secondary indexes	yes	no	no		yes
SQL Support of SQL	yes	no	no	SQL-like query language	no
APIs and other access methods	JDBC ODBC	in-process shared library	HTTP REST	OpenCypher	.Net
Supported programming languages	C Java Perl Python R	Actionscript C C# C++ Go Java JavaScript (Node.js) Lua Objective-C Pike Python Ruby	Go Java Python Ruby		.Net
Server-side scripts Stored procedures	yes	no	no		no
Triggers	yes	no	yes via Hawkular Alerting		Callbacks are triggered when data changes
Partitioning methods Methods for storing different data on different nodes	Sharding Implicit feature of the cloud service	none	Sharding based on Cassandra	horizontal partitioning	Sharding
Replication methods Methods for redundantly storing data on multiple nodes	yes Implicit feature of the cloud service	none	selectable replication factor based on Cassandra
MapReduce Offers an API for user-defined Map/Reduce methods	no	no	no		no
Consistency concepts Methods to ensure consistency in a distributed system	Immediate Consistency		Eventual Consistency based on Cassandra Immediate Consistency based on Cassandra		Immediate Consistency
Foreign keys Referential integrity	yes	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	ACID	no	no		ACID
Concurrency Support for concurrent manipulation of data	yes	yes Read/Write Locking	yes	yes	yes
Durability Support for making data persistent	yes	yes	yes	yes	yes
In-memory capabilities Is there an option to define some or all structures to be held in-memory only.	no		no		yes
User concepts Access control	fine grained access rights according to SQL-standard	no	no	yes	Based on Windows Authentication
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More resources
	Alibaba Cloud AnalyticDB for PostgreSQL former name was HybridDB	EJDB	Hawkular Metrics	Transwarp StellarDB	VelocityDB
Recent citations in the news	Two Critical Flaws Found in Alibaba Cloud's PostgreSQL Databases 20 April 2023, The Hacker News Accidental ‘write’ Permissions In Alibaba PostgreSQL Let Attackers Access Sensitive Data 22 April 2023, GBHackers Two critical vulnerabilities spotted in Alibaba Cloud's PostgreSQL databases 21 April 2023, TEISS Alibaba Cloud to spur AI innovation with upcoming Singapore hackathon in March | KrASIA 21 February 2024, KrASIA How Data Analytics Capabilities of Alibaba Group Evolve Its Ecosystem to the Cloud 20 February 2021, DataDrivenInvestor provided by Google News		Waiting for Red Hat OpenShift 4.0? Too late, 4.1 has already arrived… • DEVCLASS 5 June 2019, DevClass provided by Google News

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