skip method for offset in MongoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the skip() method do in MongoDB?

The skip() method tells MongoDB to ignore a specified number of documents from the start of the query result. It helps to jump over documents, useful for pagination.

beginner

How do you use skip() to get the second page of results if each page shows 10 documents?

Use .skip(10) to skip the first 10 documents and then .limit(10) to get the next 10 documents for the second page.

beginner

True or False: skip() changes the order of documents returned by MongoDB.

False. skip() only skips documents but does not change the order. To control order, use sort().

intermediate

What happens if you use skip() with a number larger than the total documents in the collection?

MongoDB returns an empty result set because it skips past all available documents.

intermediate

Why is using skip() with large offsets not efficient?

Because MongoDB still scans the skipped documents internally, so skipping many documents can slow down the query.

What does db.collection.find().skip(5) do?

A Deletes the first 5 documents

B Returns only the first 5 documents

C Sorts documents by 5

D Skips the first 5 documents and returns the rest

skip(5) ignores the first 5 documents and returns documents starting from the 6th.

Which method should you use with skip() to limit the number of documents returned?

A find()

B sort()

C limit()

D count()

Use limit() to specify how many documents to return after skipping.

If you want to get the third page of results with 20 documents per page, what is the correct skip() value?

A 40

B 20

C 60

D 3

Skip = (page_number - 1) * page_size = (3 - 1) * 20 = 40.

Does skip() affect the order of documents returned?

A Yes, it sorts documents

B No, order stays the same

C Yes, it reverses order

D No, but it filters documents

skip() only skips documents, it does not change their order.

What is a downside of using skip() with very large numbers?

A It slows down the query

B It returns duplicate documents

C It changes document order

D It deletes documents

Skipping many documents makes MongoDB scan through them, which slows down the query.

Explain how the skip() method works in MongoDB and when you would use it.

Think about how you would show pages of results in a list.

Describe the performance considerations when using skip() with large offsets in MongoDB.

Consider what happens behind the scenes when skipping many documents.