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DBMS > Cassandra vs. OpenSearch vs. Oracle Rdb vs. Realm

System Properties Comparison Cassandra vs. OpenSearch vs. Oracle Rdb vs. Realm

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Editorial information provided by DB-Engines
NameCassandra  Xexclude from comparisonOpenSearch  Xexclude from comparisonOracle Rdb  Xexclude from comparisonRealm  Xexclude from comparison
DescriptionWide-column store based on ideas of BigTable and DynamoDB infoOptimized for write accessA distributed, RESTful search and analytics engine forked from Elasticsearch and based on Apache LuceneA DBMS built for use on mobile devices that’s a fast, easy to use alternative to SQLite and Core Data
Primary database modelWide column storeSearch engineRelational DBMSDocument store
Secondary database modelsVector DBMS infostarting with release V5Vector DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score101.89
Rank#12  Overall
#1  Wide column stores
Score16.36
Rank#37  Overall
#4  Search engines
Score1.08
Rank#184  Overall
#85  Relational DBMS
Score7.60
Rank#52  Overall
#9  Document stores
Websitecassandra.apache.orggithub.com/­opensearch-project
opensearch.org
www.oracle.com/­database/­technologies/­related/­rdb.htmlrealm.io
Technical documentationcassandra.apache.org/­doc/­latestopensearch.org/­docs/­latestwww.oracle.com/­database/­technologies/­related/­rdb-doc.htmlrealm.io/­docs
DeveloperApache Software Foundation infoApache top level project, originally developped by FacebookAmazon Web ServicesOracle, originally developed by Digital Equipment Corporation (DEC)Realm, acquired by MongoDB in May 2019
Initial release2008202119842014
Current release4.1.3, July 20232.5.0, January 20237.4.1.1, 2021
License infoCommercial or Open SourceOpen Source infoApache version 2Open Source infoApache Version 2.0commercialOpen Source
Cloud-based only infoOnly available as a cloud servicenononono
DBaaS offerings (sponsored links) infoDatabase as a Service

Providers of DBaaS offerings, please contact us to be listed.
Astra DB: Multi-cloud DBaaS built on Apache Cassandra.
  • Aiven for OpenSearch: Fully managed open source search and analytics suite. Out-of-the-box integrations get you up and running in a couple of clicks.
  • STACKIT OpenSearch offers OpenSearch in a managed version in enterprise grade, 100% GDPR-compliant, for a wide range of applications like analytics, website search, offering scalability and fast data access.
Implementation languageJavaJava
Server operating systemsBSD
Linux
OS X
Windows
All OS with a Java VMHP Open VMSAndroid
Backend: server-less
iOS
Windows
Data schemeschema-freeschema-free infoFlexible type definitions. Once a type is defined, it is persistentFlexible Schema (defined schema, partial schema, schema free)yes
Typing infopredefined data types such as float or dateyesyesyesyes
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.nonono
Secondary indexesrestricted infoonly equality queries, not always the best performing solutionyes infoAll search fields are automatically indexedyesyes
SQL infoSupport of SQLSQL-like SELECT, DML and DDL statements (CQL)SQL-like query languageyesno
APIs and other access methodsProprietary protocol infoCQL (Cassandra Query Language, an SQL-like language)
Thrift
Java API
RESTful HTTP/JSON API
Supported programming languagesC#
C++
Clojure
Erlang
Go
Haskell
Java
JavaScript infoNode.js
Perl
PHP
Python
Ruby
Scala
Go
Java
JavaScript (Node.js)
PHP
Python
Ruby infoElasticsearch client
.Net
Java infowith Android only
Objective-C
React Native
Swift
Server-side scripts infoStored proceduresnoyesno inforuns within the applications so server-side scripts are unnecessary
Triggersyesyes infoby using the 'percolation' featureyes infoChange Listeners
Partitioning methods infoMethods for storing different data on different nodesSharding infono "single point of failure"Shardingnone
Replication methods infoMethods for redundantly storing data on multiple nodesselectable replication factor infoRepresentation of geographical distribution of servers is possibleyesnone
MapReduce infoOffers an API for user-defined Map/Reduce methodsyesnono
Consistency concepts infoMethods to ensure consistency in a distributed systemEventual Consistency
Immediate Consistency infocan be individually decided for each write operation
Eventual Consistency infoSynchronous doc based replication. Get by ID may show delays up to 1 sec. Configurable write consistency: one, quorum, allImmediate ConsistencyImmediate Consistency
Foreign keys infoReferential integritynonoyesno
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of datano infoAtomicity and isolation are supported for single operationsnoyes, on a single nodeACID
Concurrency infoSupport for concurrent manipulation of datayesyesyes
Durability infoSupport for making data persistentyesyesyesyes
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.nonoyes infoIn-Memory realm
User concepts infoAccess controlAccess rights for users can be defined per objectyes
More information provided by the system vendor
CassandraOpenSearchOracle RdbRealm
Specific characteristicsApache Cassandra is the leading NoSQL, distributed database management system, well...
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OpenSearch is a highly scalable and extensible open-source software suite for search,...
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Competitive advantagesNo single point of failure ensures 100% availability . Operational simplicity for...
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Distributed as fully open source under Apache License, Version 2.0 (ALv2), OpenSearch...
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Typical application scenariosInternet of Things (IOT), fraud detection applications, recommendation engines, product...
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The OpenSearch platform is used across a broad range of search , analytics, and observability...
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Key customersApple, Netflix, Uber, ING,, Intuit,Fidelity, NY Times, Outbrain, BazaarVoice, Best...
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Market metricsCassandra is used by 40% of the Fortune 100.
» more
Licensing and pricing modelsApache license  Pricing for commercial distributions provided by DataStax and available...
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The OpenSearch Project offers open source software licensed under Apache License...
» more

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3rd partiesCassandra Forward event: Want to level up your Cassandra game? Watch now replays of the March 2023 sessions.
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CData: Connect to Big Data & NoSQL through standard Drivers.
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Aiven for OpenSearch: Fully managed open source search and analytics suite. Out-of-the-box integrations get you up and running in a couple of clicks.
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CassandraOpenSearchOracle RdbRealm
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