DynamoDB simple Primary Key

Question 1

Primary Key with only a Partition Key

Answer 1

Chooses which partition data is written to.

Overview

Question 2

Partition Key uniqueness

Answer 2

Must be unique when using a simple primary key.

Important Points

Question 3

Partition Key Definition

Answer 3

Must be unique.

Important Points

Question 4

Partition Key Length

Answer 4

Can be 1 to 255 characters and is case-sensitive.

Important Points

Question 5

New Data ID and Date

Answer 5

ID: 1002
Date: 1993-01-05

Data Partitioning

Question 6

Existing Partitions

Answer 6

Partition A: ID: 1000 Date: 1993-01-03
Partition B: ID: 1001 Date: 1993-01-04
Partition C: ID: 1002 Date: 1993-01-05

Data Partitioning

Question 7

DynamoDB’s Internal Hash Function

Answer 7

It’s a secret; the algorithm for deciding the partition for writing data is not disclosed.

Internal Mechanism