Introduction tomongodb
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This document introduces MongoDB, an open-source document database. It describes MongoDB as schema-less, highly scalable, and capable of replication and auto-sharding. Key features include storing data as JSON documents, a familiar database and collection structure, easy insertion and querying of documents, and aggregation of data using map-reduce functions. The document encourages readers to try MongoDB themselves by downloading it or exploring online tutorials.
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![Document Store
? Data is stored in the form of JSON data.
{
"_id" : ObjectId("4ccbfc75bd163019417c27f8"),
"title": ¡°Hello World! ",
"author": {
"firstname": "Joe",
"lastname": "Bloggs"
},
"tags": ["test", "foo", "bar"]
}](https://image.slidesharecdn.com/introductiontomongodb-101101020119-phpapp02/85/Introduction-tomongodb-5-320.jpg)
![Inserts ¨C Easy As Pie!
use cookbook;
db.desserts.save({
name: "Cherry Pie",
ingredients: ["cherries", "pie"],
cooking_time: 30
});](https://image.slidesharecdn.com/introductiontomongodb-101101020119-phpapp02/85/Introduction-tomongodb-7-320.jpg)
![Reduce Function
? Takes the results from the map function
? Does something (normally combine the results)
? Produces output in key/value pairs
reduce = function(key, values) {
var count = 0;
values.forEach(function(v) {
count += v[¡®count¡¯];
}
return {count: count;}
}](https://image.slidesharecdn.com/introductiontomongodb-101101020119-phpapp02/85/Introduction-tomongodb-12-320.jpg)
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Introduction tomongodb
- 2. But First, A Little About Me ? My name¡¯s Lee Theobald. Hello! ? Twitter: @Leesy ? Never updated blog: http://www.ltheobald.co.uk/ ? I¡¯m a developer at a small search company in Cambridge called Open Objects.
- 4. ? NoSQL database ? The name is short for humongous ? Open source with development lead by 10Gen (http://www.10gen.com) ? Document Based ? Schema-less ? Highly Scalable ? MapReduce ? Replication & Auto Sharding
- 5. Document Store ? Data is stored in the form of JSON data. { "_id" : ObjectId("4ccbfc75bd163019417c27f8"), "title": ¡°Hello World! ", "author": { "firstname": "Joe", "lastname": "Bloggs" }, "tags": ["test", "foo", "bar"] }
- 6. Familiar Structure ? MongoDB instances contain a number of databases which in turn contain a number of collections. ? Think of MySQL with it¡¯s databases & tables. ? But collections can also be nested. E.g. ? customer_a (Database) ¡ð logs_201009 (Collection) ? top_queries (Collection)
- 7. Inserts ¨C Easy As Pie! use cookbook; db.desserts.save({ name: "Cherry Pie", ingredients: ["cherries", "pie"], cooking_time: 30 });
- 8. Searching ¨C A Piece Of Cake db.recipes.find({ cooking_time: { ¡°$gte¡±: 10, ¡°$lt¡±: 30} }) db.recipes.findOne()
- 9. Some More Advanced Query Syntax ? Limiting ? db.find().limit(10); ? Skipping ? db.find( ).skip(5); ? Sorting ? db.find({¡}).sort({cooking_time: ¡°-1¡±}); ? Cursors ? var cur = db.find({¡}).cursor() ? cur.forEach( function(x) { print(tojson(x)) });
- 10. MapReduce ? Great way of doing bulk manipulation or aggregation. ? 2 or 3 functions written in JavaScript that execute on the server. ? An example use could be generating a list of top queries from some search logs.
- 11. Map Function ? Takes some input of the form of key/value pairs. ? Does something with that ? Returns 0 or more key/value pairs map = function() { if (!this.query) { return; } emit (this.query, {count: 1}); }
- 12. Reduce Function ? Takes the results from the map function ? Does something (normally combine the results) ? Produces output in key/value pairs reduce = function(key, values) { var count = 0; values.forEach(function(v) { count += v[¡®count¡¯]; } return {count: count;} }
- 13. Replica Sets ? Master/Slave configuration ? If your primary server goes down, one of the secondary ones takes over.
- 14. Auto Sharding
- 15. But Why Not Try It Yourself ? Download it at: http://www.mongodb.org ? Online tutorial at:http://www.mongodb.org/display/DOCS /Tutorial ? Some handy MongoDB sites: ? MongoDB Cookbook: http://cookbook.mongodb.org/ ? Kyle Banker¡¯s blog: http://kylebanker.com/blog/