Command Prompt Tutorial

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Commands (Cont. 2 )

•  You can even declare variables which may contain whole set of data.

•  Now after defining the variable “doc”, we have to save it explicitly, by applying the save command over the data collection.

•  Now, if you want to fetch a particular document from the collection, then use its index number. For instance:-

•  You can use a variable to assign value to some other document.

•   Indexing in mongoDB

           db.collection_name.ensureIndex({key:1});

           

here key is the file on which we want to perform the indexing and 1 represents ascending order and -1 represents descending order.

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