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DBMS > DataFS vs. LMDB vs. Memcached

System Properties Comparison DataFS vs. LMDB vs. Memcached

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Editorial information provided by DB-Engines
NameDataFS  Xexclude from comparisonLMDB  Xexclude from comparisonMemcached  Xexclude from comparison
DescriptionAll data is stored inside objects which are linked by so-called link attributes. Objects consist of classes which can be extended and de-extended at runtime. Graphs can be defined with a struct.A high performant, light-weight, embedded key-value database libraryIn-memory key-value store, originally intended for caching
Primary database modelObject oriented DBMSKey-value storeKey-value store
Secondary database modelsGraph DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score0.09
Rank#360  Overall
#17  Object oriented DBMS
Score2.09
Rank#121  Overall
#20  Key-value stores
Score18.08
Rank#32  Overall
#4  Key-value stores
Websitenewdatabase.comwww.symas.com/­symas-embedded-database-lmdbwww.memcached.org
Technical documentationdev.mobiland.com/­Overview.xspwww.lmdb.tech/­docgithub.com/­memcached/­memcached/­wiki
DeveloperMobiland AGSymasDanga Interactive infooriginally developed by Brad Fitzpatrick for LiveJournal
Initial release201820112003
Current release1.1.263, October 20220.9.32, January 20241.6.27, May 2024
License infoCommercial or Open SourcecommercialOpen SourceOpen Source infoBSD license
Cloud-based only infoOnly available as a cloud servicenonono
DBaaS offerings (sponsored links) infoDatabase as a Service

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Implementation languageCC
Server operating systemsWindowsLinux
Unix
Windows
FreeBSD
Linux
OS X
Unix
Windows
Data schemeClasses, Structs, and Lists are written in proprietary DataTypeDefinitionLanguage (.dtdl) and Objects consisting of those are written in proprietary DataAccessDefinitionLanguage (.dadl)schema-freeschema-free
Typing infopredefined data types such as float or dateyesno
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 indexesnonono
SQL infoSupport of SQLnonono
APIs and other access methods.NET Client API
Proprietary client DLL
WinRT client
Proprietary protocol
Supported programming languages.Net
C
C#
C++
VB.Net
.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
.Net
C
C++
ColdFusion
Erlang
Java
Lisp
Lua
OCaml
Perl
PHP
Python
Ruby
Server-side scripts infoStored proceduresnono
Triggersno, except callback-events from server when changes happenednono
Partitioning methods infoMethods for storing different data on different nodesProprietary Sharding systemnonenone
Replication methods infoMethods for redundantly storing data on multiple nodesnonenone infoRepcached, a Memcached patch, provides this functionallity
MapReduce infoOffers an API for user-defined Map/Reduce methodsnonono
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate ConsistencyImmediate Consistency
Foreign keys infoReferential integrityyesnono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACIDACIDno
Concurrency infoSupport for concurrent manipulation of datayesyesyes
Durability infoSupport for making data persistentyesyesno
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.noyes
User concepts infoAccess controlWindows-Profilenoyes infousing SASL (Simple Authentication and Security Layer) protocol

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More resources
DataFSLMDBMemcached
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