Replica set configuration basics in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initiate a replica set with the name 'rs0'.

MongoDB

rs.initiate({ _id: [1], members: [{ _id: 0, host: "localhost:27017" }] })

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

A"rs0"

B0

C"replicaSet"

Drs0

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the replica set name.

Using a number instead of a string for the replica set name.

The replica set name must be a string, so it should be enclosed in quotes.

2fill in blank

medium

Complete the code to add a second member to the replica set with host 'localhost:27018'.

MongoDB

rs.initiate({ _id: "rs0", members: [{ _id: 0, host: "localhost:27017" }, { _id: [1], host: "localhost:27018" }] })

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

A1

B"1"

C2

D"2"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an integer for _id.

Using a duplicate _id value.

Member _id values must be unique integers starting from 0.

3fill in blank

hard

Fix the error in the code to correctly configure the priority of the first member to 2.

MongoDB

rs.initiate({ _id: "rs0", members: [{ _id: 0, host: "localhost:27017", priority: [1] }] })

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

A"2"

Bpriority: 2

Ctrue

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around the priority number.

Including the key 'priority:' inside the blank.

The priority value must be a number without quotes.

4fill in blank

hard

Fill both blanks to configure a hidden member with _id 2 and host 'localhost:27019'.

MongoDB

rs.initiate({ _id: "rs0", members: [{ _id: 0, host: "localhost:27017" }, { _id: 1, host: "localhost:27018" }, { _id: [1], host: [2], hidden: true }] })

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

A2

B"localhost:27019"

C"localhost:27020"

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong _id number.

Using the wrong host string.

The hidden member should have _id 2 and the correct host string.

5fill in blank

hard

Fill all three blanks to configure an arbiter with _id 3, host 'localhost:27020', and votes set to 1.

MongoDB

rs.initiate({ _id: "rs0", members: [{ _id: 0, host: "localhost:27017" }, { _id: 1, host: "localhost:27018" }, { _id: 2, host: "localhost:27019", hidden: true }, { _id: [1], host: [2], arbiterOnly: true, votes: [3] }] })

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

A2

B"localhost:27020"

C1

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using duplicate _id values.

Setting votes to 0 or forgetting to set votes.

The arbiter must have a unique _id 3, the correct host string, and votes set to 1.