MongoDB Practice Test 2

1. Which of the following flag can be set by mongo shell?

None of the mentioned

Timeout

noTimeout

Time

2. Point out the wrong statement.

Indexes can include keys from embedded documents and arrays

Documents have static schema in MongoDB

Eventually-consistent reads can be distributed over replicated servers

None of the mentioned

3. Which of the following preference determines how the client direct read operations to the set?

read

update

write

delete

4. Point out the wrong statement.

Embedding related data in documents may lead to situations where documents grow after creation

All of the mentioned

Embedded data models make it possible to update related data in a single atomic write operation

With the MMAPv1 storage engine, document growth can impact write performance and lead to data fragmentation

5. Point out the wrong statement.

By default GridFS limits chunk size to 255k

GridFS is useful only for storing files that exceed 16MB

All of the mentioned

When you query a GridFS store for a file, the driver or client will reassemble the chunks as needed

6. A query may include a ___________ that specifies the fields from the matching documents to return.

union

selection

projection

none of the mentioned

7. Point out the wrong statement.

Client libraries provide a convenient, injection free, process to build these objects

MongoDB represents queries as BSON objects

All of the mentioned

Field names in MongoDB’s query language have semantic meaning

8. A query _______ consists of a combination of query, sort, and projection specifications.

plan

shape

stats

all of the mentioned

9. With an __________ write concern, MongoDB does not acknowledge the receipt of write operations.

Unacknowledged

Acknowledgement

Nacknowledged

Acknowledged

10. Point out the correct statement.

None of the mentioned

With MongoDB, you cannot embed related data in a single structure or document

The key consideration for the structure of your documents is the decision to embed or to use references

Reference schema is generally known as “denormalized” models