Capped collections for fixed-size data in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a capped collection named 'logs' with a maximum size of 1MB.

MongoDB

db.createCollection('logs', { [1]: true, size: 1048576 })

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

Acapped

BexpireAfterSeconds

CmaxDocuments

DautoIndexId

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'autoIndexId' instead of 'capped'.

Confusing 'maxDocuments' with 'capped'.

Using 'expireAfterSeconds' which is for TTL collections.

The capped option must be set to true to create a capped collection.

2fill in blank

medium

Complete the code to create a capped collection with a maximum of 1000 documents.

MongoDB

db.createCollection('events', { capped: true, size: 5242880, [1]: 1000 })

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

Alimit

BmaxDocuments

Cmax

DmaxSize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'max' which is not a valid option.

Using 'limit' which is not recognized in this context.

Confusing 'maxSize' with document count limit.

The maxDocuments option limits the number of documents in a capped collection.

3fill in blank

hard

Fix the error in the command to create a capped collection named 'cache' with size 2MB.

MongoDB

db.createCollection('cache', { capped: [1], size: 2097152 })

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

Atrue

Bfalse

C'true'

D'false'

Attempts:

3 left

💡 Hint

Common Mistakes

Using string 'true' instead of boolean true.

Setting capped to false which disables capped collection.

Using quotes around boolean values.

The capped option must be set to the boolean true, not a string.

4fill in blank

hard

Fill both blanks to create a capped collection named 'messages' with size 5MB and max 5000 documents.

MongoDB

db.createCollection('messages', { [1]: true, size: [2], maxDocuments: 5000 })

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

Acapped

BmaxSize

C5242880

DmaxDocs

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'maxSize' instead of 'size'.

Using 'maxDocs' which is not a valid option.

Setting capped to false.

Use capped: true to enable capped collection and set size to 5242880 bytes (5MB).

5fill in blank

hard

Fill all three blanks to create a capped collection named 'audit' with size 10MB, max 10000 documents, and enable autoIndexId.

MongoDB

db.createCollection('audit', { [1]: true, size: [2], [3]: true })

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

Acapped

B10485760

CautoIndexId

DmaxDocuments

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'maxDocuments' instead of 'autoIndexId' for the third blank.

Setting size to an incorrect byte value.

Not enabling capped collection.

Set capped: true to enable capped collection, size to 10485760 bytes (10MB), and autoIndexId: true to create an index on _id.