MongoDB supports various data types including null, string, boolean, date, array, embedded documents, ObjectId, and BSON. The ObjectId data type is a unique identifier that is automatically generated. It consists of a 12-byte hexadecimal number, with the first 4 bytes representing the timestamp, next 3 bytes representing the machine identifier, following 2 bytes representing the process id, and last 3 bytes being an incrementing counter.

1. MongoDB
DataTypes
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2. DataType
• Null Datatype : ,“mName”:null-
• String : ,“fName”:”anish”-
• Boolean : ,“married”:false}
• Date : ,“accountOpeningDate”: new Date()-
• Array : ,“posts” : *“good”,”bad”,”average”+-
• embeddedDocument : ,“publisher" : ,“name" :
“address"--
• BSON (Covered Later)
• ObjectId
• More detailed
http://api.mongodb.org/perl/current/MongoDB/DataTyp
es.html
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3. Most important the AutoGenerated
Object ID DataType
• Size 12 bytes
• First 4 refer to timeStamp (513c60fa)
• Next 3 byte : hash of the hostname (b2080f)
• Next 2 bytes taken from the PID (8932)
• Last three byte is increment counter (86d0a4)
Example
> db.user.find()
• { "_id" : ObjectId("513c60fab2080f893286d0a4"),
"lName" : "anish", "date" : ISODate("2013-03-
10T10:31:18.632Z") }
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4. •Thanks for Watching
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