Why NoSQL Makes Sense

Why NoSQL Makes Senseand when to use something else?
Dwight Merriman / 10gen / MongoDB

The Scaling ImperativeIt already was needed but now...

cloud
commodity
http://www.globalnerdy.com/2007/09/07/multicore-musings/

NoSQL =
Non-relational next generation operation data stores and databases
no joins +
light transactional semantics =
horizontally scalable architectures

Scaling Out
distribution & query models
Consistent hashing
Order preserving range
chunking
Scatter gather

Data models
no joins +
light transactional semantics =
horizontally scalable architectures
Important side effect :
new data models =
improved ways to develop apps
(“Agility”)

{
_id : ObjectId("4e2e3f92268cdda473b628f6"),
title : “Too Big to Fail”,
when : Date(“2011-07-26”),
author : “joe”,
text : “blah”
}

{
when : Date(“2011-07-26”),
author : “joe”,
text : “blah”,
tags : [“business”, “news”, “north america”]
}
> db.posts.find( { tags : “news” } )

{
when : Date(“2011-07-26”),
author : “joe”,
text : “blah”,
tags : [“business”, “news”, “north america”],
votes : 3,
voters : [“dmerr”, “sj”, “jane” ]
}

{
when : Date(“2011-07-26”),
author : “joe”,
text : “blah”,
votes : 3,
voters : [“dmerr”, “sj”, “jane” ],
comments : [
{ by : “tim157”, text : “great story” },
{ by : “gora”, text : “i don’t think so” },
{ by : “dmerr”, text : “also check out...” }
]
}

{
when : Date(“2011-07-26”),
author : “joe”,
text : “blah”,
votes : 3,
comments : [
]
}
> db.posts.find({title:”Too Big to Fail”})
`

{
when : Date(“2011-07-26”),
author : “joe”,
text : “blah”,
votes : 3,
comments : [
]
}
> db.posts.find( { “comments.by” : “gora” } )
> db.posts.ensureIndex( { “comments.by” : 1 } )

the db space 2000 - 2010
+ great for complex transactions
+ great for tabular data
+ ad hoc queries easy
- O<->R mapping hard
- speed/scale challenges
- not super agile
+ ad hoc queries easy
+ SQL gives us a standard protocol for the interface between clients and servers
+ scales horizontally better than operational dbs. some scale limits at massive scale
- schemas are rigid
- real time is hard; very good at bulk nightly data loads

the db space
+ fits OO programming well
+ agile
+ speed/scale
- querying a little less add hoc
- not super transactional
- not sql

Thanks
Dwight Merriman
CEO 10gen
http://blog.mongodb.org/
@mongodb
me - @dmerr
jobs@10gen.com
www.mongodb.org
www.mongodb.org/display/DOCS/Events

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Why NoSQL Makes Sense

by Dwight Merriman on Aug 24, 2011

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Why NoSQL Makes Sense — Presentation Transcript