MongoDB MCQ Quiz (Multiple Choice Questions And Answers)
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- Multikey Index
- Compound Index
- Text Index
- Sparse Index
17. Consider that the posts collection contains an array called ratings which contains ratings given to the post by various users in the following format:
{
_id: 1,
post_text: "This is my first post",
ratings: [5, 4, 2, 5],
//other elements of document
}
Which of the following query will return all the documents where the rating array contains elements that in some combination satisfy the query conditions?
- db.inventory.find( { ratings: { $elemMatch: { $gt: 3, $lt: 6 } } } )
- db.inventory.find( { ratings: { ratings: { $gt: 5, $lt: 9 } } } )
- db.inventory.find( { ratings: { ratings.$: { $gt: 5, $lt: 9 } } } )
- db.inventory.find( { ratings: { $elemMatch: { $gte: 3, $lte: 6 } } } )
18. Which option should be used with findAndModify() command to return the modified document instead of the pre-modification document?
- findAndModify by default returns the pre-modification document
- Set {new : true}
- Use the POST version of findAndModify called findAndModifyPost
- Both b and c are valid
- fs.files and fs.chunks
- fs.grid and fs.chunks
- fs.parts and fs.files
- fs.chunks and fs.parts
- Manual References
- DBRefs
- Both a and b
- There is no concept of relations in documents
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