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DBMS > LMDB vs. Splunk vs. VelocityDB vs. XTDB

System Properties Comparison LMDB vs. Splunk vs. VelocityDB vs. XTDB

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Editorial information provided by DB-Engines
NameLMDB  Xexclude from comparisonSplunk  Xexclude from comparisonVelocityDB  Xexclude from comparisonXTDB infoformerly named Crux  Xexclude from comparison
DescriptionA high performant, light-weight, embedded key-value database libraryAnalytics Platform for Big DataA .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 storeSearch engineGraph DBMS
Object oriented DBMS
Document store
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score1.94
Rank#120  Overall
#20  Key-value stores
Score93.02
Rank#13  Overall
#2  Search engines
Score0.00
Rank#385  Overall
#40  Graph DBMS
#21  Object oriented DBMS
Score0.13
Rank#330  Overall
#45  Document stores
Websitewww.symas.com/­symas-embedded-database-lmdbwww.splunk.comvelocitydb.comgithub.com/­xtdb/­xtdb
www.xtdb.com
Technical documentationwww.lmdb.tech/­docdocs.splunk.com/­Documentation/­Splunkvelocitydb.com/­UserGuidewww.xtdb.com/­docs
DeveloperSymasSplunk Inc.VelocityDB IncJuxt Ltd.
Initial release2011200320112019
Current release0.9.32, January 20247.x1.19, September 2021
License infoCommercial or Open SourceOpen Sourcecommercial infoLimited free edition and free developer edition availablecommercialOpen 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 languageCC#Clojure
Server operating systemsLinux
Unix
Windows
Linux
OS X
Solaris
Windows
Any that supports .NETAll OS with a Java 8 (and higher) VM
Linux
Data schemeschema-freeyesyesschema-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 indexesnoyesyesyes
SQL infoSupport of SQLnono infoSplunk Search Processing Language for search commandsnolimited SQL, making use of Apache Calcite
APIs and other access methodsHTTP REST.NetHTTP REST
JDBC
Supported programming languages.Net
C
C++
Clojure
Go
Haskell
Java
JavaScript (Node.js)
Lisp
Lua
MatLab
Nim
Objective C
OCaml
Perl
PHP
Python
R
Ruby
Rust
Swift
Tcl
C#
Java
JavaScript
PHP
Python
Ruby
.NetClojure
Java
Server-side scripts infoStored proceduresnoyesnono
TriggersnoyesCallbacks are triggered when data changesno
Partitioning methods infoMethods for storing different data on different nodesnoneShardingShardingnone
Replication methods infoMethods for redundantly storing data on multiple nodesnoneMulti-source replicationyes, each node contains all data
MapReduce infoOffers an API for user-defined Map/Reduce methodsnoyesnono
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate ConsistencyEventual ConsistencyImmediate Consistency
Foreign keys infoReferential integritynononono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDno infoA 'Transaction' in Splunk has a different meaning: grouping related events into a single one for later searchingACIDACID
Concurrency infoSupport for concurrent manipulation of datayesyesyesyes
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.yesnoyes
User concepts infoAccess controlnoAccess rights for users and rolesBased on Windows Authentication

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More resources
LMDBSplunkVelocityDBXTDB infoformerly named Crux
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