16 July 2013

NoSQL - MongoDB



Key / Valye (HashMap)
Tabular (BigTable)
Document Oriented

no Joins
no Complex Transactions
no SQL

databasse -> database
table -> collection
row -> document

JSON style document (BSON on the mongoDB servers)

no predefined schema
table has schema
collection does not have schema

we do not need to pre-create the collection, first insertion will create the collection

_id : timestamp+machine id+process id+counter

db.posts.find
$gt : greater than

index ensureindex comments.author 1



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