1. NoSQL Concepts, Redis, MongoDB, CouchDB
NoSQL Databases
NoSQL Concepts, Redis, MongoDB, CouchDB
Svetlin Nakov
Manager Technical Training
Telerik Software Academy
academy.telerik.com

2. Table of Contents NoSQL Databases Overview Redis MongoDB
Ultra-fast data structures server
Redis Cloud: managed Redis
MongoDB
Powerful and mature NoSQL database
MongoLab: managed MongoDB in the cloud

3. Overview, Models, Concepts, Examples
NoSQL Databases
Overview, Models, Concepts, Examples

4. Non-Relational Data Models
Document model
Set of documents, e.g. JSON strings
Key-value model
Set of key-value pairs
Hierarchical key-value
Hierarchy of key-value pairs
Wide-column model
Key-value model with schema
Object model
Set of OOP-style objects

5. What is NoSQL Database? NoSQL (cloud) databases
Use document-based model (non-relational)
Schema-free document storage
Still support indexing and querying
Still support CRUD operations (create, read, update, delete)
Still supports concurrency and transactions
Highly optimized for append / retrieve
Great performance and scalability
NoSQL == “No SQL” or “Not Only SQL”?

6. Relational vs. NoSQL Databases
Relational databases
Data stored as table rows
Relationships between related rows
Single entity spans multiple tables
RDBMS systems are very mature, rock solid
NoSQL databases
Data stored as documents
Single entity (document) is a single record
Documents do not have a fixed structure

7. Relational vs. NoSQL Models
Relational Model
Document Model
Name
Svetlin Nakov
Gender
male
Phone
Site
Name: Svetlin Nakov
Gender: male
Phone:
Address:
- Street: Al. Malinov 31
- Post Code: 1729
- Town: Sofia
- Country: Bulgaria
Site: * 1
Street
Al. Malinov 31
Post Code
1729 * 1
Town
Sofia * 1
Country
Bulgaria

8. Ultra-Fast Data Structures Server
Redis
Ultra-Fast Data Structures Server

9. What is Redis? Redis is Redis stores data structures:
Ultra-fast in-memory key-value data store
Powerful data structures server
Open-source software:
Redis stores data structures:
Strings
Lists
Hash tables
Sets / sorted sets

10. Hosted Redis Providers
Redis Cloud
Fully managed Redis instance in the cloud
Highly scalable, highly available
Free 1 GB instance, stored in the Amazon cloud
Supports data persistence and replication
Redis To Go
5 MB free non-persistent Redis instance

11. C# API for Redis ServiceStack.Redis API Sample C# code:
github.com/ServiceStack/ServiceStack.Redis
Sample C# code:
string redisHost = "redis.garantiadata.com";
int redisPort = 14233;
string redisPass =
using (var redisClient =
new RedisClient(redisHost, redisPort, redisPass)) {
string key = "username";
string value = "nakov";
redisClient.Set<string>(key, value);
Console.WriteLine(redisClient.Get<string>(key)); }

12. Redis on a Local Machine
Live Demo

13. Mature and Very Powerful NoSQL Database
MongoDB
Mature and Very Powerful NoSQL Database

14. What is MongoDB? MongoDB – http://mongodb.org
Very powerful and mature NoSQL database
Scalable, high-performance, open-source
JSON-style document storage, schemaless
Replication & high-availability support
Auto sharding – clustering & data partitioning
Indexing and powerful querying
Map-Reduce – parallel data processing
GridFS – store files of any size

15. Hosted MongoDB Providers
MongoLab
Free 0.5 GB instance
MongoHQ
Free 0.5 GB instance (sandbox)
MongoOd
Free 100 MB instance

16. C# API for MongoDB The official MongoDB C# driver from 10gen
github.com/mongodb/mongo-csharp-driver
Sample C# code:
var connectionStr =
var client = new MongoClient(connectionSt);
var server = client.GetServer();
var db = server.GetDatabase("mongodb-name");
var persons = db.GetCollection<Person>("Persons");
persons.Insert<Person>(new Person(…));
var resultPersons =
from p in persons.AsQueryable<Person>()
where p.Address.Town == "Sofia"
select p;

17. MongoDB on a Local Machine
Live Demo

18. NoSQL Databases

19. Exercises
Write a simple "Dictionary" application in C# or JavaScript to perform the following in MongoDB:
Add a dictionary entry (word + translation)
List all words and their translations
Find the translation of given word
The UI of the application is up to you (it could be Web-based, GUI or console-based).
You may use MongoLab.
You may install the "Official MongoDB C# Driver" from NuGet or download it from its publisher:

20. Exercises (2)
Implement the previous task (a simple "Dictionary" application) using Redis.
You may hold the "word + meaning pairs" in a hash (see
See the HSET, HKEYS and HGET commands
You may use a local Redis instance or register for a free "Redis To Go" account at
You may download the client libraries for your favorite programming language from or use the "ServiceStack.Redis" C# client from the NuGet package manager.

21. Exercises (3)
* Implement а program, which synchronizes mouse movement and clicking between multiple computers. Users can "give control" to other users. Users sign in with username and password. Users "in control" can revoke their control. A user can be signed in on several machines at once. Store user data in MongoLab. Store the mouse sync data in the "Redis To Go" cloud.
Note: In the real world data would pass through a server, as direct access from the client to the database is a security concern. This task is meant more as an experiment than a real-world scenario.

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