What are the advantages and disadvantages of using UUIDs in identification systems?

UUID (Universally Unique Identifier) is a 128-bit identifier used for the unique identification of objects in distributed systems.

Advantages:

• Global uniqueness without the need for a centralized server.
• Suitable for distributed systems and microservices where coordinating ID generation is difficult.
• Allows creating IDs on the client side.

Disadvantages:

• The size of UUID (16 bytes) is larger than traditional numeric IDs, which can affect performance and database size.
• UUIDs are unordered, which can degrade index performance in databases.
• Hard to remember and visually perceive compared to numeric IDs.

Example of UUID generation in Java:

import java.util.UUID;

UUID uuid = UUID.randomUUID();
System.out.println(uuid.toString());