Following quiz provides Multiple Choice Questions (MCQs) related to MongoDB Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
By default, MongoDB will automatically close a cursor when the client has exhausted all results in the cursor. However, for capped collections you may use a Tailable Cursor that remains open after the client exhausts the results in the initial cursor.
Q 7 - Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.
$match filters the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.
Q 8 - Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?
{
“_id”:1,
“post_text”:”This is a sample post”,
“author”:”Tom”,
“comments”:[
{
“author”:”Joe”,
“comment_text”:”This is comment 1”
},
{
“author”:”Leo”,
“comment_text”:”This is comment 2”
}
]
}
MongoDB uses multikey indexes to index the content stored in arrays. If you index a field that holds an array value, MongoDB creates separate index entries for every element of the array.
