UUID vs UUIDv7 vs Snowflake ID: Choosing the Right Identifier for Backend Systems

ID generation looks like a small backend decision. In many systems, we simply add an id column, make it the primary key, and move on. But once the table grows, this decision can affect database performance, indexing, pagination, debugging, and how easily the system scales across services. The common choices are: UUIDv4 UUIDv7 Snowflake ID Each one solves the uniqueness problem, but they behave differently in real backend systems. UUIDv4: Simple, Random, and Widely Used UUIDv4 is one of the most