![{:sku => ‘637636’,
:name => ‘Linen tailored pant’,
:about => [{:title => ‘fabric & care’,
:content => [‘Dry clean’,
‘Imported’]},
{:title => ‘overview’,
:content => [‘Tailored fit’,
‘Yarn dyed’]}
]
} *](https://image.slidesharecdn.com/training-slides-100510132008-phpapp02/75/FrozenRails-Training-24-2048.jpg)
Uploaded byMike Dirolf
FrozenRails Training
The document provides an overview of MongoDB training which includes introducing key MongoDB concepts like documents, collections, queries and indexes. It also demonstrates how to install and use MongoDB including running commands and queries in the mongo shell. Examples are provided of BSON formatting and the MongoDB wire protocol for sending messages between clients and servers.
FrozenRails Training
- 1. Training http://www.mongodb.org/
- 2.
- 3. • memcached scalability & performance • key/value • RDBMS depth of functionality
- 4. Key-‐Value MongoDB Relational
- 5.
- 6. “ODM”s Ruby driver The “mongo” JS shell
- 7.
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- 9. BSON {“hello”: “bson”} x15 x00 x00 x00 x02 h e l l o x00 x05 x00 x00 x00 b s o n x00 x00 http://bsonspec.org
- 10.
- 11. Messages • TCP/IP WireProtocol • Separate messages for insert, update, query, get_more, delete, etc. http://www.mongodb.org/display/DOCS/Mongo+Wire+Protocol
- 12. Anatomy of aninsert use foo; db.test.insert({“hello”: “bson”}); message length request id response id op code (insert) x67x00x00x00 xXXxXXxXXxXX x00x00x00x00 xd2x07x00x00 reserved collection name document(s) x00x00x00x00 f o o . t e s t x00 BSON({“hello”: “bson”}) http://www.mongodb.org/display/DOCS/Mongo+Wire+Protocol
- 13. _id is theprimary key
- 14. all about objectids MongoDB standard Timestamp 12-byte BSON type If you still use a string, careful:
- 15. what’s in anoid?
- 16. what’s in anoid? 4b6857a0 timestamp
- 17. what’s in anoid? 4b6857a07613c3 timestamp machine id
- 18. what’s in anoid? 4b6857a07613c36709 timestamp machine id process id
- 19. what’s in anoid? 4b6857a07613c367094426b2 timestamp machine id process id counter
- 21. Simulating a flexibleschema
- 22. Simulating a flexibleschema What’s the join like?
- 23. Simulating a flexibleschema What’s the join like? Can we reason about it?
- 24. {:sku => ‘637636’, :name => ‘Linen tailored pant’, :about => [{:title => ‘fabric & care’, :content => [‘Dry clean’, ‘Imported’]}, {:title => ‘overview’, :content => [‘Tailored fit’, ‘Yarn dyed’]} ] } *
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- 34. Commands db.foo.drop(); = db.foo.runCommand({drop: "foo"}); = db.$cmd.findOne({drop: "foo"}); = db.$cmd.find({drop: "foo"}).limit(-‐1);
- 35. Query optimizer find({x: 10, y: “foo”}) scan terminate index on x index on y remember
- 36. Replication master slave master master slave slave slave slave master master slave master
- 37. Replication • oplog -capped collection • idempotent ($inc -> $set)
- 38. Auto-sharding Shards mongod mongod mongod ... Config mongod mongod mongod Servers mongod mongod mongod mongos mongos ... client
- 39. Geohashing (20, 10) (0001 0100, 0000 1010) 0000 0010 0110 0100 (21, 9) 0000 0010 0110 0011 Problem: bit-flips (127 vs 128)