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DBMS > Solr

Solr System Properties

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Editorial information provided by DB-Engines
NameSolr
DescriptionA widely used enterprise search engine based on Apache Lucene
Primary database modelSearch engine
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score61.48
Rank#16  Overall
#3  Search engines
Websitelucene.apache.org/­solr
Technical documentationlucene.apache.org/­solr/­resources.html
DeveloperApache Software Foundation
Initial release2004
Current release7.6.0, December 2018
License infoCommercial or Open SourceOpen Source infoApache Version 2
Cloud-based only infoOnly available as a cloud serviceno
Implementation languageJava
Server operating systemsAll OS with a Java VM and a servlet container inforuns as a servlet in servlet container (e.g. Tomcat, Jetty is included)
Data schemeyes infoDynamic Fields enables on-the-fly addition of new fields
Typing infopredefined data types such as float or dateyes infosupports customizable data types and automatic typing
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.no
Secondary indexesyes infoAll search fields are automatically indexed
SQL infoSupport of SQLno infosupports limited query time joins
APIs and other access methodsJava API
RESTful HTTP API
Supported programming languages.Net
Erlang
Java
JavaScript
any language that supports sockets and either XML or JSON
Perl
PHP
Python
Ruby
Scala
Server-side scripts infoStored proceduresJava plugins
Triggersyes infoUser configurable commands triggered on index changes
Partitioning methods infoMethods for storing different data on different nodesSharding
Replication methods infoMethods for redundantly storing data on multiple nodescloud/distributed (via Zookeeper)
Master-slave replication
MapReduce infoOffers an API for user-defined Map/Reduce methodsno
Consistency concepts infoMethods to ensure consistency in a distributed systemEventual Consistency infoslaves poll the master in predefined intervalls
Foreign keys infoReferential integrityno
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of dataoptimistic locking infoSolr 4
Concurrency infoSupport for concurrent manipulation of datayes
Durability infoSupport for making data persistentyes
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.no

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More resources
Solr
DB-Engines blog posts

Elasticsearch replaced Solr as the most popular search engine
12 January 2016, Paul Andlinger

Enterprise Search Engines almost double their popularity in the last 12 months
2 July 2014, Paul Andlinger

The DB-Engines ranking includes now search engines
4 February 2013, Paul Andlinger

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Recent citations in the news

Economy Energy likely to enter SoLR process after credit default
7 January 2019, Utility Week

Open source search engines attract developers
15 January 2019, TechTarget

After Oracle WebLogic miner attack, critical Apache Solr bug is now targeted
9 March 2018, ZDNet

Ofgem gives green light to SoLR licence condition changes
5 November 2018, Utility Week

What is Apache Solr? And why you should use it
20 July 2017, InfoWorld

provided by Google News

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