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DBMS > Realm vs. RocksDB vs. VoltDB

System Properties Comparison Realm vs. RocksDB vs. VoltDB

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Editorial information provided by DB-Engines
NameRealm  Xexclude from comparisonRocksDB  Xexclude from comparisonVoltDB  Xexclude from comparison
DescriptionA DBMS built for use on mobile devices that’s a fast, easy to use alternative to SQLite and Core DataEmbeddable persistent key-value store optimized for fast storage (flash and RAM)Distributed In-Memory NewSQL RDBMS infoUsed for OLTP applications with a high frequency of relatively simple transactions, that can hold all their data in memory
Primary database modelDocument storeKey-value storeRelational DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score9.13
Rank#48  Overall
#8  Document stores
Score3.10
Rank#92  Overall
#15  Key-value stores
Score1.74
Rank#123  Overall
#61  Relational DBMS
Websiterealm.iorocksdb.orgwww.voltdb.com
Technical documentationrealm.io/­docsgithub.com/­facebook/­rocksdb/­wikidocs.voltdb.com
DeveloperRealm, acquired by MongoDB in May 2019Facebook, Inc.VoltDB Inc.
Initial release201420132010
Current release6.15.5 , February 202110.1, October 2020
License infoCommercial or Open SourceOpen SourceOpen Source infoBSDOpen Source infoAGPL for Community Edition, commercial license for Enterprise, AWS, and Pro Editions
Cloud-based only infoOnly available as a cloud servicenonono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageC++Java, C++
Server operating systemsAndroid
Backend: server-less
iOS
Windows
Linux
OS X infofor development
Data schemeyesschema-freeyes
Typing infopredefined data types such as float or dateyesnoyes
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.nono
Secondary indexesyesnoyes
SQL infoSupport of SQLnonoyes infoonly a subset of SQL 99
APIs and other access methodsC++ API
Java API
Java API
JDBC
RESTful HTTP/JSON API
Supported programming languages.Net
Java infowith Android only
Objective-C
React Native
Swift
C++
Java
C#
C++
Erlang infonot officially supported
Go
Java
JavaScript infoNode.js
PHP
Python
Server-side scripts infoStored proceduresno inforuns within the applications so server-side scripts are unnecessarynoJava
Triggersyes infoChange Listenersnono
Partitioning methods infoMethods for storing different data on different nodesnonenoneSharding
Replication methods infoMethods for redundantly storing data on multiple nodesnonenoneMulti-source replication
Source-replica replication
MapReduce infoOffers an API for user-defined Map/Reduce methodsnonono
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate Consistency
Foreign keys infoReferential integritynonono infoFOREIGN KEY constraints are not supported
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDyesACID infoTransactions are executed single-threaded within stored procedures
Concurrency infoSupport for concurrent manipulation of datayesyes infoData access is serialized by the server
Durability infoSupport for making data persistentyesyesyes infoSnapshots and command logging
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.yes infoIn-Memory realmyes
User concepts infoAccess controlyesnoUsers and roles with access to stored procedures
More information provided by the system vendor
RealmRocksDBVoltDB
Specific characteristicsNow a part of MongoDB Data Platform , Realm Database is the fast, easy to use, and...
» more
Competitive advantagesRealm ensures offline-first functionality, meaning apps run smoothly and deliver...
» more
Typical application scenariosMobile Consumer Apps First-Line Worker Apps
» more
Key customersCathay Pacific Royal Carribbean Cruise Lines Open Source Database powers apps built...
» more
Market metricsUsed by 100,000+ developers 2 bn installs Currently used in 40k+ applications in...
» more
Licensing and pricing modelsRealm database is licensed under the Apache License v2.0.
» more

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More resources
RealmRocksDBVoltDB
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