Brief overview of NoSQL & MongoDB for GTUG Tbilisi Event

transcript

Ioseb DzmanashviliLead Architect @ PicktekTeacher @ Caucasus School of Technology

Monday, April 2, 2012

NoSQL is a ill-defined and volatile field© Martin Fowler

It actually means: Not Only SQL

MongoDBCouchDBRedisNeo4jCassandra

MySqlOracleM$SQL

PostgreSQLSQLite

NoSQL SQL

NoSQL Kinds

•Document Oriented

•Key Value Oriented

•Graph Oriented

• ...

•Something else Oriented

Other NoSQL Characteristics

•No Relational Structures

•No JOIN Queries

•No Schema

•No Complex Transactions

MongoDB

open-source, high-performance, document-oriented database

Why MongoDB?

It is not the strongest of the species that survives, nor the most intelligent. It is the one that is most adaptable to change.

db.blogposts.insert({ name: "ioseb", date: "2012-04-01", title: "NoSQL Sucks", summary: "Yes it Sucks", content: "..."});

Flexible Structure

Flexible Structuredb.blogposts.update({ name: "ioseb" }, { name: "ioseb", date: "2012-04-01", title: "NoSQL is Cool!", summary: "Yes it's Cool!", content: "...", tags: [ "nosql", "sql" ] });

Flexible Structurevar comment = { name: "john doe", email: "john@doe.com", comment: "NoSQL Rulez!!!"};

db.blogposts.update({ name: "ioseb" }, { $push: { comments: comment } });

Flexible Structure

var post = db.blogposts.find( {name: "ioseb"});

Flexible Structure{ name: "ioseb", date: "2012-04-01", title: "NoSQL is Cool!", summary: "Yes it's Cool!", content: "...", tags: [ "nosql", "sql" ], comments: [ {author: "john", email: "john@doe.com", ...} ]}

Flexible Indexing// index by namedb.blogposts.ensureIndex( {name: true});

// index by tags arraydb.blogposts.ensureIndex( {tags: true});

// index by comments authorsdb.blogposts.ensureIndex( {"comments.author": true});

Replica Sets

•Asynchronous master/slave replication

•Automatic failover

•Automatic recovery

•Consists of two or more nodes

•Automatic primary node election

...Replica Sets

Member 2 Member 1

Member 3Primary

ClientRead/Write

Easy Configuration

config = {_id: 'GTUG', members: [ {_id: 0, host: 'localhost:27017'}, {_id: 1, host: 'localhost:27018'}, {_id: 2, host: 'localhost:27019'}]}

rs.initiate(config);

...Replica Sets Arbiter

Member 2ArbiterNo Data Member 1

Member 3Primary ClientRead/Write

Easy Configuration

config = {_id: 'GTUG', members: [ {_id: 0, host: 'localhost:27017'}, {_id: 1, host: 'localhost:27018'}, {_id: 2, host: 'localhost:27019', arbiterOnly: true}]}

rs.initiate(config);

Questions?

Thank You!