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A Tour of the NoSQL WorldDavid Cassel, MarkLogic Sr. Consultant7 Nov 2011

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Why NoSQL?

RDBMSes are• familiar

• ubiquitous

• backed by a body of research

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Why NoSQL?

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What is NoSQL?

• "NoSQL refers to a class of databases 1) are intended to perform at internet (Facebook, Twitter, LinkedIn) scale and 2) reject the relational model in favor of other (key-value, document, graph) models." -- http://www.greenhornconnect.com/blog/dan-croak-what-nosql

• "Next Generation Databases mostly addressing some of the points: being non-relational, distributed, open-source and horizontally scalable. The original intention has been modern web-scale databases. … Often more characteristics apply as: schema-free, easy replication support, simple API, eventually consistent /BASE (not ACID), a huge data amount, and more." -- http://nosql-database.org/

• "NoSQL (sometimes expanded to "not only SQL") is a broad class of database management systems that differ from classic relational database management systems (RDBMSes)…. These data stores may not require fixed table schemas, usually avoid join operations, and typically scale horizontally." -- Wikipedia

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What is NoSQL?

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Graph Databases

Dave

Dawn Chris

statusMarkLogic

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Key-Value Storeapp_setting_width 450user1923_color Reduser1923_age 18user3371_color Blueuser4344_color Brackishuser1923_height 6' 0"user3371_age 34error_msg_457 There is no file %1 hereerror_message_1 There is no user with %1 name1923_name Jimuser1923_name Jim Smithuser1923_lname SmithApplication_Installed truelog_errors 1install_path C:\Windows\System32\RestrictedServerName localhosttest testtest1 testtest123 Brackishdevonlywonderwomanvalue key

http://dba.stackexchange.com/questions/607/what-is-a-key-value-store-database

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Column Stores

id first last zip23 Bugs Bunny 48389983 Foghorn Leghorn 19394420 Marvin Martian 04829185 Elmer Fudd 25749

23,Bugs,Bunny,48389983,Foghorn,Leghorn,19394420,Marvin,Martian,04829185,Elmer,Fudd,25749

23,983,420,185Bugs,Foghorn,Marvin,ElmerBunny,Leghorn,Martian,Fudd48389,19394,04829,25749

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Document Store

/posts/a-custom-facet-for-the-search-api.xml

<post> …</post>

/posts/unparsing-a-custom-facet.xml <post> …</post>

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Querying a Document Store

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Querying a Document Store

<post> <meta> <title>A custom facet for the Search API</title> <author>David Cassel</author> <published>2011-07-27</published> <summary>…</summary> <tags> <tag>marklogic</tag> <tag>search api</tag> </tags> <category>Software Development</category> </meta> <text>…</text></post>

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Querying a Document Store

cts:search(/blog, cts:and-query(( cts:word-query(“facet”) cts:near-query(( cts:word-query(“search api”) cts:word-query(“custom”)), 10) ))) db.things.find({name:"mongo"

}).forEach(printjson);

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Scaling

Scale Up

Scale Out

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Growing the database

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No Schema

New Requirement: Our company has acquired a small publishing

house. Put their publications in the database with our existing ones.

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Does all this help?

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ACID properties

A C I D

tomicity

onsistency

solation

urability

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ACID -- Atomicity

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ACID -- Consistency

/content/foo.xmlid

Name

Job

1 Dave Developer1 Bob Sales

1

2

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ACID -- Isolation

Write DoneWrite

Read

t=0 t=1 t=2 t=3

Dirty readsNon-repeatable readsPhantom reads

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ACID – Durability

RAM Journal Disk

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NoSQL Support

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Where does MarkLogic fit?

A C I D

tomicity

onsistency

solation

urability

Express License

Enterprise Level (100s of terabytes)

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The Other Side of the Coin

Variety Architecture (yay!)

Maturity Administration Tool support Knowledgeable developers

Support Open Source – support companies Commercial – MarkLogic

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NoSQL means:The Right Tool for the Job

Blog: http://blog.davidcassel.netTwitter: @dmcassel