Primary and secondary nodes in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find the primary node in a MongoDB replica set.

MongoDB

rs.status().members.find(member => member.[1] === 'PRIMARY')

Drag options to blanks, or click blank then click option'

AstateStr

Bname

Chealth

Duptime

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' instead of 'stateStr' to identify the primary node.

Confusing 'health' with node role.

The 'stateStr' field indicates the node state, such as 'PRIMARY' or 'SECONDARY'.

2fill in blank

medium

Complete the command to step down the primary node in a MongoDB replica set.

MongoDB

rs.[1]()

Drag options to blanks, or click blank then click option'

AstepDown

Bfreeze

Creconfig

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'reconfig' which changes the replica set configuration.

Using 'freeze' which prevents elections temporarily.

The 'stepDown()' command forces the primary to step down and triggers an election.

3fill in blank

hard

Fix the error in the command to add a secondary node to the replica set.

MongoDB

rs.add('[1]')

Drag options to blanks, or click blank then click option'

Alocalhost

Blocalhost:27018

C27018

DsecondaryNode

Attempts:

3 left

💡 Hint

Common Mistakes

Providing only hostname without port.

Providing only port number.

The 'add()' method requires the hostname and port in 'host:port' format.

4fill in blank

hard

Fill both blanks to create a query that finds all secondary nodes in the replica set.

MongoDB

rs.status().members.filter(member => member.[1] === '[2]')

Drag options to blanks, or click blank then click option'

AstateStr

Bname

CSECONDARY

DPRIMARY

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' instead of 'stateStr' for filtering.

Filtering for 'PRIMARY' instead of 'SECONDARY'.

Filtering by 'stateStr' equal to 'SECONDARY' returns all secondary nodes.

5fill in blank

hard

Fill all three blanks to configure a member as a hidden secondary node in the replica set configuration.

MongoDB

{ _id: [1], host: '[2]', hidden: [3] }

Drag options to blanks, or click blank then click option'

A2

Blocalhost:27019

Ctrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Setting 'hidden' to false for a hidden member.

Omitting the port in the host string.

The member id is 2, host is 'localhost:27019', and 'hidden' must be true to hide the secondary.