Atlas connection string setup in MongoDB - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ query_result

intermediate

What is the correct format of a MongoDB Atlas connection string?

Given the following connection string, what is the expected output when trying to connect to the database?

mongodb+srv://user:[e-mail]/myFirstDatabase?retryWrites=true&w=majority

Assume the credentials are correct and the cluster is accessible.

A Connection established successfully to the 'myFirstDatabase' database.

B Syntax error due to missing port number in the connection string.

C Connection established but to the default 'admin' database instead of 'myFirstDatabase'.

D Connection fails because 'retryWrites' is not a valid parameter.

💡 Hint

Look carefully at the connection string format and parameters.

The connection string uses the correct 'mongodb+srv' protocol, includes username, password, cluster address, and specifies the database 'myFirstDatabase'. The 'retryWrites' and 'w' parameters are valid options. No port is needed with 'mongodb+srv'.

📝 Syntax

intermediate

Identify the syntax error in this Atlas connection string

Which option contains a syntax error that will prevent connection to MongoDB Atlas?

A mongodb+srv://user:[e-mail]/myFirstDatabase?retryWrites=true&w=majority

B mongodb+srv://user:[e-mail]/myFirstDatabase?retryWrites=true&w=majority&ssl=true

C mongodb+srv://user:[e-mail]/myFirstDatabase?retryWrites=true&w=majority&

D mongodb+srv://user:[e-mail]/myFirstDatabase

💡 Hint

Check the query parameters and their separators.

Option C ends with an extra '&' which is invalid syntax in a URI query string and will cause connection failure.

🧠 Conceptual

advanced

Why is the port number omitted in MongoDB Atlas connection strings using 'mongodb+srv'?

Select the correct reason why Atlas connection strings with 'mongodb+srv' do not include a port number.

A Because the SRV record in DNS automatically provides the host and port information.

B Because Atlas only supports connections on the default MongoDB port 27017.

C Because the port number is included in the username field instead.

D Because the driver ignores port numbers when using 'mongodb+srv'.

💡 Hint

Think about how DNS SRV records work.

The 'mongodb+srv' protocol uses DNS SRV records to discover the hosts and ports automatically, so the port number is not needed in the connection string.

🔧 Debug

advanced

Why does this connection string fail to connect to Atlas?

Given this connection string:

mongodb+srv://user:[e-mail]/?retryWrites=true&w=majority

Why might the connection fail even if credentials are correct?

A Because the protocol should be 'mongodb' not 'mongodb+srv'.

B Because 'retryWrites' is set to true which is not supported.

C Because the password is missing in the connection string.

D Because the database name is missing after the cluster address.

💡 Hint

Check if the database to connect to is specified.

The connection string does not specify a database name after the cluster address, so the driver may default to 'test' or fail depending on configuration.

❓ optimization

expert

Optimizing Atlas connection string for read preference

Which connection string option correctly sets the read preference to 'secondaryPreferred' for better read scalability?

A mongodb+srv://user:[e-mail]/myDB?read_preference=secondaryPreferred

B mongodb+srv://user:[e-mail]/myDB?readPreference=secondaryPreferred

C mongodb+srv://user:[e-mail]/myDB?readPreference=secondary_preferred

D mongodb+srv://user:[e-mail]/myDB?readPreference=secondaryPreferred=true

💡 Hint

Check the exact parameter name and value format.

The correct parameter is 'readPreference' with value 'secondaryPreferred'. Underscores or extra '=true' are invalid.