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DBMS > ObjectBox vs. OpenQM vs. Realm vs. XTDB

System Properties Comparison ObjectBox vs. OpenQM vs. Realm vs. XTDB

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Editorial information provided by DB-Engines
NameObjectBox  Xexclude from comparisonOpenQM infoalso called QM  Xexclude from comparisonRealm  Xexclude from comparisonXTDB infoformerly named Crux  Xexclude from comparison
DescriptionExtremely fast embedded database for small devices, IoT and MobileQpenQM is a high-performance, self-tuning, multi-value DBMSA DBMS built for use on mobile devices that’s a fast, easy to use alternative to SQLite and Core DataA general purpose database with bitemporal SQL and Datalog and graph queries
Primary database modelObject oriented DBMSMultivalue DBMSDocument storeDocument store
Secondary database modelsTime Series DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score1.29
Rank#166  Overall
#5  Object oriented DBMS
Score0.34
Rank#284  Overall
#10  Multivalue DBMS
Score7.41
Rank#52  Overall
#8  Document stores
Score0.18
Rank#332  Overall
#46  Document stores
Websiteobjectbox.iowww.rocketsoftware.com/­products/­rocket-multivalue-application-development-platform/­rocket-open-qmrealm.iogithub.com/­xtdb/­xtdb
www.xtdb.com
Technical documentationdocs.objectbox.iorealm.io/­docswww.xtdb.com/­docs
DeveloperObjectBox LimitedRocket Software, originally Martin PhillipsRealm, acquired by MongoDB in May 2019Juxt Ltd.
Initial release2017199320142019
Current release3.4-121.19, September 2021
License infoCommercial or Open SourceOpen Source infoApache License 2.0Open Source infoGPLv2, extended commercial license availableOpen SourceOpen Source infoMIT License
Cloud-based only infoOnly available as a cloud servicenononono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageC and C++Clojure
Server operating systemsAndroid
iOS
Linux
macOS
Windows
AIX
FreeBSD
Linux
macOS
Raspberry Pi
Solaris
Windows
Android
Backend: server-less
iOS
Windows
All OS with a Java 8 (and higher) VM
Linux
Data schemeyesyes infowith some exceptionsyesschema-free
Typing infopredefined data types such as float or dateyesyesyes, extensible-data-notation format
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.noyesnono
Secondary indexesyesyesyesyes
SQL infoSupport of SQLnononolimited SQL, making use of Apache Calcite
APIs and other access methodsProprietary native APIHTTP REST
JDBC
Supported programming languagesC
C++
Dart
Go
Java
JavaScript infoplanned (as of Jan 2019)
Kotlin
Python infoplanned (as of Jan 2019)
Swift
.Net
Basic
C
Java
Objective C
PHP
Python
.Net
Java infowith Android only
Objective-C
React Native
Swift
Clojure
Java
Server-side scripts infoStored proceduresnoyesno inforuns within the applications so server-side scripts are unnecessaryno
Triggersnoyesyes infoChange Listenersno
Partitioning methods infoMethods for storing different data on different nodesnoneyesnonenone
Replication methods infoMethods for redundantly storing data on multiple nodesonline/offline synchronization between client and serveryesnoneyes, each node contains all data
MapReduce infoOffers an API for user-defined Map/Reduce methodsnononono
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate ConsistencyImmediate ConsistencyImmediate Consistency
Foreign keys infoReferential integrityyesnonono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDACIDACIDACID
Concurrency infoSupport for concurrent manipulation of datayesyesyes
Durability infoSupport for making data persistentyesyesyesyes, flexibel persistency by using storage technologies like Apache Kafka, RocksDB or LMDB
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.noyes infoIn-Memory realm
User concepts infoAccess controlyesAccess rights can be defined down to the item levelyes
More information provided by the system vendor
ObjectBoxOpenQM infoalso called QMRealmXTDB infoformerly named Crux
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More resources
ObjectBoxOpenQM infoalso called QMRealmXTDB infoformerly named Crux
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