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DBMS > Blazegraph vs. Datomic vs. RocksDB vs. Snowflake vs. VelocityDB

System Properties Comparison Blazegraph vs. Datomic vs. RocksDB vs. Snowflake vs. VelocityDB

Editorial information provided by DB-Engines
NameBlazegraph  Xexclude from comparisonDatomic  Xexclude from comparisonRocksDB  Xexclude from comparisonSnowflake  Xexclude from comparisonVelocityDB  Xexclude from comparison
Amazon has acquired Blazegraph's domain and (probably) product. It is said that Amazon Neptune is based on Blazegraph.
DescriptionHigh-performance graph database supporting Semantic Web (RDF/SPARQL) and Graph Database (tinkerpop3, blueprints, vertex-centric) APIs with scale-out and High Availability.Datomic builds on immutable values, supports point-in-time queries and uses 3rd party systems for durabilityEmbeddable persistent key-value store optimized for fast storage (flash and RAM)Cloud-based data warehousing service for structured and semi-structured dataA .NET Object Database that can be embedded/distributed and extended to a graph data model (VelocityGraph)
Primary database modelGraph DBMS
RDF store
Relational DBMSKey-value storeRelational DBMSGraph DBMS
Object oriented DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score0.81
Rank#213  Overall
#19  Graph DBMS
#8  RDF stores
Score1.66
Rank#144  Overall
#66  Relational DBMS
Score3.41
Rank#86  Overall
#11  Key-value stores
Score130.36
Rank#8  Overall
#5  Relational DBMS
Score0.11
Rank#354  Overall
#37  Graph DBMS
#15  Object oriented DBMS
Websiteblazegraph.comwww.datomic.comrocksdb.orgwww.snowflake.comvelocitydb.com
Technical documentationwiki.blazegraph.comdocs.datomic.comgithub.com/­facebook/­rocksdb/­wikidocs.snowflake.net/­manuals/­index.htmlvelocitydb.com/­UserGuide
DeveloperBlazegraphCognitectFacebook, Inc.Snowflake Computing Inc.VelocityDB Inc
Initial release20062012201320142011
Current release2.1.5, March 20191.0.7075, December 20239.2.1, May 20247.x
License infoCommercial or Open SourceOpen Source infoextended commercial license availablecommercial infolimited edition freeOpen Source infoBSDcommercialcommercial
Cloud-based only infoOnly available as a cloud servicenononoyesno
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageJavaJava, ClojureC++C#
Server operating systemsLinux
OS X
Windows
All OS with a Java VMLinuxhostedAny that supports .NET
Data schemeschema-freeyesschema-freeyes infosupport of semi-structured data formats (JSON, XML, Avro)yes
Typing infopredefined data types such as float or dateyes infoRDF literal typesyesnoyesyes
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.nonoyesno
Secondary indexesyesyesnoyes
SQL infoSupport of SQLSPARQL is used as query languagenonoyesno
APIs and other access methodsJava API
RESTful HTTP API
SPARQL QUERY
SPARQL UPDATE
TinkerPop 3
RESTful HTTP APIC++ API
Java API
CLI Client
JDBC
ODBC
.Net
Supported programming languages.Net
C
C++
Java
JavaScript
PHP
Python
Ruby
Clojure
Java
C
C++
Go
Java
Perl
Python
Ruby
JavaScript (Node.js)
Python
.Net
Server-side scripts infoStored proceduresyesyes infoTransaction Functionsnouser defined functionsno
TriggersnoBy using transaction functionsno infosimilar concept for controling cloud resourcesCallbacks are triggered when data changes
Partitioning methods infoMethods for storing different data on different nodesShardingnone infoBut extensive use of caching in the application peershorizontal partitioningyesSharding
Replication methods infoMethods for redundantly storing data on multiple nodesyesnone infoBut extensive use of caching in the application peersyesyes
MapReduce infoOffers an API for user-defined Map/Reduce methodsnonononono
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate Consistency or Eventual Consistency depending on configurationImmediate ConsistencyImmediate ConsistencyImmediate Consistency
Foreign keys infoReferential integrityyes infoRelationships in Graphsnonoyesno
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDACIDyesACIDACID
Concurrency infoSupport for concurrent manipulation of datayesyesyesyesyes
Durability infoSupport for making data persistentyesyes infousing external storage systems (e.g. Cassandra, DynamoDB, PostgreSQL, Couchbase and others)yesyesyes
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.yes inforecommended only for testing and developmentyesnoyes
User concepts infoAccess controlSecurity and Authentication via Web Application Container (Tomcat, Jetty)nonoUsers with fine-grained authorization concept, user roles and pluggable authenticationBased on Windows Authentication

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More resources
BlazegraphDatomicRocksDBSnowflakeVelocityDB
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