Keyset pagination for performance in Rest API - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is keyset pagination?

Keyset pagination is a method to fetch data pages using a unique key from the last item of the previous page instead of using page numbers. It improves performance by avoiding slow database scans.

beginner

Why is keyset pagination faster than offset pagination?

Keyset pagination uses a fixed key to jump directly to the next set of results, avoiding scanning all previous rows like offset pagination does. This reduces database load and speeds up queries.

intermediate

In keyset pagination, what is typically used as the key?

A unique and indexed column, often a primary key or a timestamp, is used as the key to mark the last seen item and fetch the next page efficiently.

intermediate

How does keyset pagination handle sorting?

Keyset pagination requires a consistent sort order on the key column(s) so that the next page starts exactly after the last item of the previous page.

intermediate

What is a limitation of keyset pagination compared to offset pagination?

Keyset pagination cannot jump to arbitrary pages directly because it depends on the last seen key. It only supports moving forward or backward sequentially.

What does keyset pagination use to fetch the next page?

A A random offset

B The page number

C The last item's unique key

D The total number of items

Keyset pagination uses the last item's unique key to fetch the next page efficiently.

Which of the following is a benefit of keyset pagination?

A Ability to jump to any page instantly

B Works without any database indexes

C Simpler to implement than offset pagination

D Faster queries on large datasets

Keyset pagination speeds up queries by avoiding scanning all previous rows.

What kind of column is best used as a key in keyset pagination?

A A non-unique text column

B A unique and indexed column

C A column with many NULL values

D A column with random values

A unique and indexed column ensures efficient and correct pagination.

What is a common sorting requirement for keyset pagination?

A Sort by the key column in a consistent order

B Sort randomly

C No sorting needed

D Sort by page number

Consistent sorting on the key column is needed to correctly fetch the next page.

Which is a limitation of keyset pagination?

A Cannot jump directly to arbitrary pages

B Slower than offset pagination on small datasets

C Requires full table scans

D Does not work with unique keys

Keyset pagination only supports sequential navigation, not direct jumps to any page.

Explain how keyset pagination improves performance compared to offset pagination.

Think about how the database finds the next set of rows.

Describe a scenario where keyset pagination might not be the best choice.

Consider when you want to go directly to page 10 without going through pages 1 to 9.