Functionality vs scalability&performance :
-mongoDB achievs both. But missing some functionality because of scalibility&performance.
Not exists in mongoDB:
-Join, transaction., schema, SQL
Exists in mongoDB:
Index, secondary Index
Command:
db
show tables
db.things.find ().pretty()
db.things.insert (..json..) or .save(json)
SchemaLess example:
> db.user.insert( {name:"kim"})
> db.user.insert( {name:"lee", age:11} )
> var j = db.user.findOne( {name:"kim"} )
> j.age = 11
> db.user.save(j)
