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DBMS > Postgres-XL vs. PouchDB vs. SingleStore vs. SQL.JS

System Properties Comparison Postgres-XL vs. PouchDB vs. SingleStore vs. SQL.JS

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Editorial information provided by DB-Engines
NamePostgres-XL  Xexclude from comparisonPouchDB  Xexclude from comparisonSingleStore infoformer name was MemSQL  Xexclude from comparisonSQL.JS  Xexclude from comparison
DescriptionBased on PostgreSQL enhanced with MPP and write-scale-out cluster featuresJavaScript DBMS with an API inspired by CouchDBMySQL wire-compliant distributed RDBMS that combines an in-memory row-oriented and a disc-based column-oriented storagePort of SQLite to JavaScript
Primary database modelRelational DBMSDocument storeRelational DBMSRelational DBMS
Secondary database modelsDocument store
Spatial DBMS
Document store
Spatial DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score0.54
Rank#227  Overall
#110  Relational DBMS
Score2.71
Rank#99  Overall
#18  Document stores
Score4.70
Rank#71  Overall
#38  Relational DBMS
Score1.01
Rank#168  Overall
#84  Relational DBMS
Websitewww.postgres-xl.orgpouchdb.comwww.singlestore.comsql.js.org
Technical documentationwww.postgres-xl.org/­documentationpouchdb.com/­guidesdocs.singlestore.comsql.js.org/­documentation/­index.html
DeveloperApache Software FoundationSingleStore Inc.Alon Zakai infoenhancements implemented by others
Initial release2014 infosince 2012, originally named StormDB201220132012
Current release10 R1, October 20187.1.1, June 20197.1.11, October 2020
License infoCommercial or Open SourceOpen Source infoMozilla public licenseOpen Sourcecommercial infofree developer edition availableOpen Source
Cloud-based only infoOnly available as a cloud servicenononono
DBaaS offerings (sponsored links) infoDatabase as a Service

Providers of DBaaS offerings, please contact us to be listed.
SingleStore Managed Service: The world's fastest, most capable cloud database for operational analytics, machine learning, & AI. Available instantly with multi-cloud and hybrid-cloud capabilities.
Implementation languageCJavaScriptC++JavaScript
Server operating systemsLinux
macOS
server-less, requires a JavaScript environment (browser, Node.js)Linux info64 bit version requiredserver-less, requires a JavaScript environment (browser, Node.js)
Data schemeyesschema-freeyesyes
Typing infopredefined data types such as float or dateyesnoyesyes
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.yes infoXML type, but no XML query functionalitynonono
Secondary indexesyesyes infovia viewsyes
SQL infoSupport of SQLyes infodistributed, parallel query executionnoyes, but no triggers and foreign keysyes infoSQL-92 is not fully supported
APIs and other access methodsADO.NET
JDBC
native C library
ODBC
streaming API for large objects
HTTP REST infoonly for PouchDB Server
JavaScript API
JDBC
ODBC
JavaScript API
Supported programming languages.Net
C
C++
Delphi
Erlang
Java
JavaScript (Node.js)
Perl
PHP
Python
Tcl
JavaScriptBash
C
C#
Java
JavaScript (Node.js)
Python
JavaScript
Server-side scripts infoStored proceduresuser defined functionsView functions in JavaScriptyesno
Triggersyesyesnono
Partitioning methods infoMethods for storing different data on different nodeshorizontal partitioningSharding infowith a proxy-based framework, named couchdb-loungeShardingnone
Replication methods infoMethods for redundantly storing data on multiple nodesMulti-source replication infoalso with CouchDB databases
Source-replica replication infoalso with CouchDB databases
Source-replica replicationnone
MapReduce infoOffers an API for user-defined Map/Reduce methodsnoyesnono
Consistency concepts infoMethods to ensure consistency in a distributed systemImmediate ConsistencyEventual ConsistencyImmediate Consistency only within each nodenone
Foreign keys infoReferential integrityyesnonoyes
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataACID infoMVCCnoACID infoOnly isolation level: READ COMMITEDACID
Concurrency infoSupport for concurrent manipulation of datayesyes, multi-version concurrency control (MVCC)
Durability infoSupport for making data persistentyesyes infoby using IndexedDB, WebSQL or LevelDB as backendyesno infoexcept by serializing a db to a file
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.noyesyesyes
User concepts infoAccess controlfine grained access rights according to SQL-standardnofine grained access rights according to SQL-standardno

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More resources
Postgres-XLPouchDBSingleStore infoformer name was MemSQLSQL.JS
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