What difficulties may arise when dividing a system into aggregates?

When dividing a system into aggregates, the following difficulties may arise:

• Defining aggregate boundaries: it is challenging to determine which objects should be included in a single aggregate to preserve invariants and minimize dependencies.
• Transaction management: aggregates must ensure data integrity within themselves, but interactions between aggregates complicate consistency.
• Performance: overly large aggregates can lead to excessive locking and reduced parallelism.
• Code complexity: improper division can lead to excessive coupling and increased maintenance difficulty.
• Handling references between aggregates: direct references should be avoided to maintain encapsulation.

It is important to carefully consider the domain model and use DDD (Domain-Driven Design) principles for proper aggregate delineation.