![Document-Oriented
{
date : Date(2007-05-07),
time : {
start : 9.25,
end : 10.25
}
sum : 0,
comments : ["task 1", "run 4", "testing module"]
}
vs.](https://image.slidesharecdn.com/latinoware-091027143708-phpapp01/85/Latinoware-10-320.jpg)
![JSON and BSON
Strict JSON types:
{
x : null, y : true, z : 123, w : "xyz",
a : { b : 1 }, c : [1, 2, 3]
}
Mongo JSON adds:
{
ts : new Date(),
query : /regex/ig,
_id : new ObjectId()
}](https://image.slidesharecdn.com/latinoware-091027143708-phpapp01/85/Latinoware-21-320.jpg)
![Collections
{
date : Date(2007-05-07),
time : {
start : 9.25,
end : 10.25
}
sum : 0,
comments : ["task 1", "run 4"]
}](https://image.slidesharecdn.com/latinoware-091027143708-phpapp01/85/Latinoware-23-320.jpg)
![Nested Objects
> db.blog.insert({title : "First Post",
content : "Hello, world!",
author : {name : "Joe", id : 123},
comments : []
})](https://image.slidesharecdn.com/latinoware-091027143708-phpapp01/85/Latinoware-27-320.jpg)
![…which gives us:
> db.blog.findOne()
{
_id : ObjectId("4ae06192213900000000745c"),
"title" : "First Post",
"content" : "Hello, world!"
"author" : {"name" : "Joe", "id" : 123}
"comments" : [{
"author" : "Fred",
"comment" : "Dumb post"
}]
}](https://image.slidesharecdn.com/latinoware-091027143708-phpapp01/85/Latinoware-31-320.jpg)
![Optimizing $where
db.blogs.findOne({
name : "Sally",
age : {'$gt' : 18},
$where : 'Array.sort(this.interests)[2]
== "volleyball"'});](https://image.slidesharecdn.com/latinoware-091027143708-phpapp01/85/Latinoware-34-320.jpg)
![Aggregation
group =~ GROUP BY
Map/Reduce
db.runCommand({
mapreduce : <collection>,
map : <mapfunction>,
reduce : <reducefunction>
[, query : <query filter object>]
[, out : <outputcollectionname>]
[, keeptemp: <true|false>]
[, finalize : <finalizefunction>]
})](https://image.slidesharecdn.com/latinoware-091027143708-phpapp01/85/Latinoware-44-320.jpg)
Latinoware
- 1. base de dados orientada a documentos para aplicações Web Kristina Chodorow
- 2. Who am I? Software Engineer at Here from New York City
- 6. CAP • Consistency nome : "joe" nome : "joe" • Availability • Partitioning
- 7. Key-Value Stores Key Value foo bar x 123 ts 6:13:26 12/3/1945 data x9Fx44x1e Tokyo Cabinet, Dynamo, MemcacheDB
- 8. Key-Value Stores •Fast •Too simple •Simple
- 10. Document-Oriented { date : Date(2007-05-07), time : { start : 9.25, end : 10.25 } sum : 0, comments : ["task 1", "run 4", "testing module"] } vs.
- 12. Consistency Availability master Partitioning slave
- 13. Consistency Availability Partitioning slave
- 14. Consistency Availability Partitioning master
- 15. Consistency Availability slave Partitioning master
- 16. Consistency Availability Partitioning Pair Router Pair Pair ...eventual consistency
- 20. A JavaScript Database $ mongodb-linux-1.0/bin/mongo MongoDB shell version: 1.0.0 url: test connecting to: test type "help" for help >
- 21. JSON and BSON Strict JSON types: { x : null, y : true, z : 123, w : "xyz", a : { b : 1 }, c : [1, 2, 3] } Mongo JSON adds: { ts : new Date(), query : /regex/ig, _id : new ObjectId() }
- 23. Collections { date : Date(2007-05-07), time : { start : 9.25, end : 10.25 } sum : 0, comments : ["task 1", "run 4"] }
- 24. Using the Shell > db test > use xyz > db xyz > db.splorch.find() >
- 25. Inserting > db.foo.insert({name : "Joe", age : 34}) > db.foo.find({name : "Joe"}) { "_id" : ObjectId("2fe3e4d892aa73234c910bed"), "name" : "Joe", "age" : 34 }
- 26. Object Ids an autogenerated primary key "_id" : ObjectId("2fe3e4d892aa73234c910bed") 12 bytes: 2fe3e4d892aa73234c910bed |------||----||--||----| ts mac pid inc
- 27. Nested Objects > db.blog.insert({title : "First Post", content : "Hello, world!", author : {name : "Joe", id : 123}, comments : [] })
- 28. Querying posts = db.blog.find({ "author" : "Joe"}) commentsByFred = db.blog.find({ "comments.author" : "Fred"}) commentedByFred = db.blog.find({ "comments.author" : /fred/i})
- 29. Speaking of indexing… db.people.ensureIndex({"age" : 1}); db.people.ensureIndex({ "name" : -1, "ts" : -1, "comments.author" : 1 });
- 30. Updating db.blog.update({title : "First Post"}, { $push : { comments : { author : "Fred", comment : "Dumb post." } } });
- 31. …which gives us: > db.blog.findOne() { _id : ObjectId("4ae06192213900000000745c"), "title" : "First Post", "content" : "Hello, world!" "author" : {"name" : "Joe", "id" : 123} "comments" : [{ "author" : "Fred", "comment" : "Dumb post" }] }
- 32. $ instead of >, <, =, etc. $gt, $gte, $lt, $lte, $eq, $neq, $exists, $set, $mod, $where, $in, $nin, $inc $push, $pull, $pop, $pushAll, $popAll db.foo.bar.find({x : {$gt : 4}})
- 33. $where db.blog.findOne({$where : 'this.y == (this.x + this.z)'}); Will work: {"x" : 1, "y" : 4, "z" : 3} {"x" : "hi", "y" : "hibye", "z" : "bye"} Won’t work: {"x" : 1, "y" : 1}
- 34. Optimizing $where db.blogs.findOne({ name : "Sally", age : {'$gt' : 18}, $where : 'Array.sort(this.interests)[2] == "volleyball"'});
- 35. Cursors cursor = db.blah.find(array("foo" : "bar")) while (cursor.hasNext()) { obj = cursor.next() }
- 36. Applications
- 37. soliMAP @trackmeet FetLife Dextify2
- 38. Paging cursor = db.results.find() .sort({"ts" : -1}) .skip(page_num * results_per_page) .limit(results_per_page);
- 39. Logging • insert/update/remove is fast • Capped collections • Schemaless • $inc for counts
- 41. Storing Files (More than 4 Mb)
- 42. Storing Files J J J chunks J J J J J J _id : J files
- 43. Storing Files ObjectId fileId = new ObjectId(); fileObj = { _id : fileId, filename : "ggbridge.png", user : "joe", takenIn : "San Francisco" } chunkObj = { fileId : fileId, chunkNum : N data : <binary data> }
- 44. Aggregation group =~ GROUP BY Map/Reduce db.runCommand({ mapreduce : <collection>, map : <mapfunction>, reduce : <reducefunction> [, query : <query filter object>] [, out : <outputcollectionname>] [, keeptemp: <true|false>] [, finalize : <finalizefunction>] })
- 45. www.mongodb.org
- 47. Thank you! [email protected] @kchodorow @mongodb irc.freenode.net#mongodb www.mongodb.org