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DBMS > Apache Phoenix vs. etcd vs. OpenMLDB vs. Oracle Coherence

System Properties Comparison Apache Phoenix vs. etcd vs. OpenMLDB vs. Oracle Coherence

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Editorial information provided by DB-Engines
NameApache Phoenix  Xexclude from comparisonetcd  Xexclude from comparisonOpenMLDB  Xexclude from comparisonOracle Coherence  Xexclude from comparison
DescriptionA scale-out RDBMS with evolutionary schema built on Apache HBaseA distributed reliable key-value storeAn open-source machine learning database that provides a feature platform for training and inferenceOracles in-memory data grid solution
Primary database modelRelational DBMSKey-value storeTime Series DBMSKey-value store
Secondary database modelsRelational DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score2.06
Rank#123  Overall
#58  Relational DBMS
Score7.03
Rank#54  Overall
#5  Key-value stores
Score0.10
Rank#359  Overall
#36  Time Series DBMS
Score1.97
Rank#129  Overall
#22  Key-value stores
Websitephoenix.apache.orgetcd.io
github.com/­etcd-io/­etcd
openmldb.aiwww.oracle.com/­java/­coherence
Technical documentationphoenix.apache.orgetcd.io/­docs
github.com/­etcd-io/­etcd/­tree/­master/­Documentation
openmldb.ai/­docs/­zh/­maindocs.oracle.com/­en/­middleware/­standalone/­coherence
DeveloperApache Software Foundation4 Paradigm Inc.Oracle
Initial release201420202007
Current release5.0-HBase2, July 2018 and 4.15-HBase1, December 20193.4, August 20192024-2 February 202414.1, August 2023
License infoCommercial or Open SourceOpen Source infoApache Version 2.0Open Source infoApache Version 2.0Open Sourcecommercial
Cloud-based only infoOnly available as a cloud servicenononono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageJavaGoC++, Java, ScalaJava
Server operating systemsLinux
Unix
Windows
FreeBSD
Linux
Windows infoexperimental
LinuxAll OS with a Java VM
Data schemeyes infolate-bound, schema-on-read capabilitiesschema-freeFixed schemaschema-free
Typing infopredefined data types such as float or dateyesnoyesyes
XML support infoSome form of processing data in XML format, e.g. support for XML data structures, and/or support for XPath, XQuery or XSLT.nononono
Secondary indexesyesnoyesno
SQL infoSupport of SQLyesnoyesno
APIs and other access methodsJDBCgRPC
JSON over HTTP
JDBC
SQLAlchemy
JCache
JPA
RESTful HTTP API
Supported programming languagesC
C#
C++
Go
Groovy
Java
PHP
Python
Scala
.Net
C
C++
Clojure
Erlang
Go
Haskell
Java
JavaScript (Node.js)
Perl
PHP
Python
R
Ruby
Rust
Scala
Tcl
C++
Go
Java
Python
Scala
.Net
C++
Java
Server-side scripts infoStored proceduresuser defined functionsnonono
Triggersnoyes, watching key changesnoyes infoLive Events
Partitioning methods infoMethods for storing different data on different nodesShardinghorizontal partitioningSharding
Replication methods infoMethods for redundantly storing data on multiple nodesMulti-source replication
Source-replica replication
Using Raft consensus algorithm to ensure data replication with strong consistency among multiple replicas.Source-replica replicationyes, with selectable consistency level
MapReduce infoOffers an API for user-defined Map/Reduce methodsHadoop integrationnono
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate Consistency or Eventual ConsistencyImmediate ConsistencyImmediate ConsistencyEventual Consistency
Immediate Consistency
Foreign keys infoReferential integritynononono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDnonoconfigurable
Concurrency infoSupport for concurrent manipulation of datayesyesyesyes
Durability infoSupport for making data persistentyesyesyesyes infooptionally
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.yesnoyesyes
User concepts infoAccess controlAccess Control Lists (using HBase ACL) for RBAC, integration with Apache Ranger for RBAC & ABAC, multi-tenancynofine grained access rights according to SQL-standardauthentification to access the cache via certificates or http basic authentication

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More resources
Apache PhoenixetcdOpenMLDBOracle Coherence
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