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DBMS > Oracle Coherence vs. VelocityDB vs. XTDB

System Properties Comparison Oracle Coherence vs. VelocityDB vs. XTDB

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Editorial information provided by DB-Engines
NameOracle Coherence  Xexclude from comparisonVelocityDB  Xexclude from comparisonXTDB infoformerly named Crux  Xexclude from comparison
DescriptionOracles in-memory data grid solutionA .NET Object Database that can be embedded/distributed and extended to a graph data model (VelocityGraph)A general purpose database with bitemporal SQL and Datalog and graph queries
Primary database modelKey-value storeGraph DBMS
Object oriented DBMS
Document store
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score1.97
Rank#129  Overall
#22  Key-value stores
Score0.11
Rank#354  Overall
#37  Graph DBMS
#15  Object oriented DBMS
Score0.18
Rank#332  Overall
#46  Document stores
Websitewww.oracle.com/­java/­coherencevelocitydb.comgithub.com/­xtdb/­xtdb
www.xtdb.com
Technical documentationdocs.oracle.com/­en/­middleware/­standalone/­coherencevelocitydb.com/­UserGuidewww.xtdb.com/­docs
DeveloperOracleVelocityDB IncJuxt Ltd.
Initial release200720112019
Current release14.1, August 20237.x1.19, September 2021
License infoCommercial or Open SourcecommercialcommercialOpen Source infoMIT License
Cloud-based only infoOnly available as a cloud servicenonono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageJavaC#Clojure
Server operating systemsAll OS with a Java VMAny that supports .NETAll OS with a Java 8 (and higher) VM
Linux
Data schemeschema-freeyesschema-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.nonono
Secondary indexesnoyesyes
SQL infoSupport of SQLnonolimited SQL, making use of Apache Calcite
APIs and other access methodsJCache
JPA
RESTful HTTP API
.NetHTTP REST
JDBC
Supported programming languages.Net
C++
Java
.NetClojure
Java
Server-side scripts infoStored proceduresnonono
Triggersyes infoLive EventsCallbacks are triggered when data changesno
Partitioning methods infoMethods for storing different data on different nodesShardingShardingnone
Replication methods infoMethods for redundantly storing data on multiple nodesyes, with selectable consistency levelyes, each node contains all data
MapReduce infoOffers an API for user-defined Map/Reduce methodsnonono
Consistency concepts infoMethods to ensure consistency in a distributed systemEventual Consistency
Immediate Consistency
Immediate Consistency
Foreign keys infoReferential integritynonono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataconfigurableACIDACID
Concurrency infoSupport for concurrent manipulation of datayesyesyes
Durability infoSupport for making data persistentyes infooptionallyyesyes, 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.yesyes
User concepts infoAccess controlauthentification to access the cache via certificates or http basic authenticationBased on Windows Authentication

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More resources
Oracle CoherenceVelocityDBXTDB infoformerly named Crux
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