can I use composite key as partition key in Dynamodb?

Question

I have a dynamodb table includes 3 fields:

uuid: string
m: string
s: string
timestamp

the UUID is the partition key and timestamp is sort key. I need to build a function to take m and s as input and return uuid to users. In order to improve query performance, I am thinking to create a global secondary index to include m and s as partition key.

But I can't find a way to create a composite partition key. Do I have to use m as partition key and s as sort key for the global secondary index? What other solutions I can use?

Answer 1

If you’re always looking for an exact match of m and s; you can create a single partition key with is just those two concatenases together.