Einführung in MongoDB

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.NET
User
Group
Bern
Roger Rudin
bbv Software Services AG
roger.rudin@bbv.ch

Agenda
– What is NoSQL
– Understanding the Motivation behind NoSQL
– MongoDB: A Document Oriented Database
– NoSQL Use Cas...

What is NoSQL?
NoSQL = Not only SQL

NoSQL Definition http://nosql-database.org/
NoSQL DEFINITION: Next Generation Databases mostly
addressing some of the poin...

Who Uses NoSQL?
• Twitter uses DBFlock/MySQL and Cassandra
• Cassandra is an open source project from Facebook
• Digg, Red...

UNDERSTANDING THE
MOTIVATION BEHIND NOSQL

Why SQL sucks..
• O/R mapping (also known as Impedance Mismatch)
• Data-Model changes are hard and expensive
• SQL databas...

What has NoSQL done?
• Implemented the most common use cases
as a piece of software
• Designed for scalability and perform...

Visual Guide To NoSQL
http://blog.nahurst.com/visual-guide-to-nosql-systems

NoSQL Data Models
• Key-Value
• Document-Oriented
• Column Oriented/Tabular

MONGODB: A DOCUMENT
ORIENTED DATABASE

NoSQL Data Model: Document
Oriented
• Data is stored as “documents”
• We are not talking about Word documents
• Comparable...

Network Communications
• REST/JSON
• TCP/BSON (ClientDriver)
BSON [bee · sahn], short for Binary JSON, is a binary-en-
cod...

Client Drivers (Apache License)
• MongoDB currently has client support for the following
programming languages:
• C
• C++
...

Collections vs. Capped Collection
(Table in SQL)
• Collections
• blog.posts
• blog.comments
• forum.users
• etc.
• Capped ...

Indexes
• Every field in the document can be indexed
• Simple Indexes:
db.cities.ensureIndex({city: 1});
• Compound indexe...

$Relations • ObjectId db.users.insert( {name: "Umbert", car_id: ObjectId("<GUID>")}); • DBRef db.users.insert( {name: "Umbe...$

Queries (1)

Queries (Regular Expressions)
{field: /regular.*expression/i}
// get all cities that start with “atl”
and end on “a” (e.g....

Queries (2) : LINQ
https://github.com/craiggwilson/fluent-mongo
Equals
x => x.Age == 21 will translate to {"Age": 21}
Grea...

Atomic Operations (Optimistic
Locking)
• Update if current:
• Fetch the object.
• Modify the object locally.
• Send an upd...

$Atomic Operations: Sample > t=db.inventory > s = t.findOne({sku:'abc'}) {"_id" : "49df4d3c9664d32c73ea865a" , "sku" : "abc...$

Atomic Operations: multiple
items
db.products.update(
{cat: “boots”, $atomic: 1},
{$inc: {price: 10.0}},
false, //no upser...

Replica set (1)
• Automatic failover
• Automatic recovery of servers that were
offline
• Distribution over more than one
D...

ReplicaSet
RECOVERING
Replica set (2)
PRIMARY
DOWN
PRIMARY

Mongo Sharding
• Partitioning data across multiple physical servers to
provide application scale-out
• Can distribute data...

Sharding-Cluster

Map Reduce
http://www.joelonsoftware.com/items/2006/08/01.html
• It is a two step calculation where one
step is used to si...

Map Reduce Sample

Map Reduce using LINQ
https://github.com/craiggwilson/fluent-mongo/wiki/Map-Reduce
• LINQ is by far an easier way to compo...

Store large Files: GridFS
• The database supports native storage of
binary data within BSON objects (limited in
size 4 – 1...

Performance
On MySql, SourceForge was reaching its limits of
performance at its current user load. Using some of
the easy ...

Performance
http://www.michaelckennedy.net/blog/2010/04/29/MongoDBVsSQLServer2008PerformanceShowdown.aspx
• It’s the inser...

Administration: MongoVUE
(Windows)

Administration: Monitoring
• MongoDB
Monitoring Service

NOSQL USE CASES

Use Cases: Well suited
• Archiving and event logging
• Document and Content Management Systems
• E-Commerce
• Gaming. High...

Use Cases: Less Well Suited
• Systems with a heavy emphasis on
complex transactions such as banking
systems and accounting...

Questions?
roger.rudin@bbv.ch