Category: MongoDB

In our posts collection, which command can be used to find all the posts whose author names begin lie between “A” and “C” in dictionary order?

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In our posts collection, which command can be used to find all the posts whose author names begin lie between “A” and “C” in dictionary order?
db.posts.find( { post_author : { $gte : “A” , $lte : “C” } } );
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db.posts.find( { post_author : { $gte : “C” , $lte : “A” } } );
db.posts.find( { post_author : { $gt : “A” , $lt : “C” } } );
This type of search is not supported by MongoDB. $lt and $gt operators are applicable only for numeric values.

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mongoimport command is used to:

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mongoimport command is used to:
imports content from an Extended JSON, CSV, or TSV export created by mongoexport
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import all the MongoDB data from one format to another
import all the data from one collection to another
import all the data from one database to another

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Which of the following methods can be used on a cursor object?

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Which of the following methods can be used on a cursor object?
All options are correct
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cursor.next()
cursor.hasNext()
cursor.forEach()

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In a sharded replica set environment, w defines the level and kind of write concern. Which of the following values of w specifies to return success only after a majority of voting members have acknowledged?

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In a sharded replica set environment, w defines the level and kind of write concern. Which of the following values of w specifies to return success only after a majority of voting members have acknowledged?
majority
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major
n
m

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Which of the following collections are used by MongoDB to store GridFS data?

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Which of the following collections are used by MongoDB to store GridFS data?
fs.files and fs.chunks
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fs.grid and fs.chunks
fs.parts and fs.files
fs.chunks and fs.parts

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Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?

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Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?
Null, Number, String and Object
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Number, Null, String and Object
String, Null, Number and Object
Null, Number, Object and String

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Which option should be used with findAndModify() command to return the modified document instead of the pre-modification document?

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Which option should be used with findAndModify() command to return the modified document instead of the pre-modification document?
Set {new : true}
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findAndModify by default returns the pre-modification document
Use the POST version of findAndModify called findAndModifyPost
None of the options are correct

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Which index is used to index the content stored in arrays?

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Which index is used to index the content stored in arrays?
Multikey Index
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Compound Index
Text Index
Sparse Index

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The application, that communicates with application MongoDB by way of a client library, is called _________________ .

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The application, that communicates with application MongoDB by way of a client library, is called _________________ .
Driver
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Parent
Rank
None of the options are correct

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