ACID vs. BASE Database Transaction Models

Learn what ACID guarantees about a transaction and what BASE describes about availability and convergence. These terms are not mutually exclusive database types. You will separate business invariants, isolation levels, replica freshness, and the failure conditions under which guarantees hold.

Handling data correctly is one of the most critical responsibilities in building any application.

A transfer within one database may need a debit and credit to commit together. A payment involving an external processor also needs coordination outside that database transaction. Identify the boundary of atomic work before relying on the ACID label.

This fundamental trade-off between consistency and availability is a central challenge that many candidates face in System Design interviews.

ACID specifies transaction properties. BASE is an informal set of design principles associated with available systems that allow temporary divergence. A system can use ACID transactions locally and asynchronous replication or derived views elsewhere.

Let’s start with the transaction models.

Transaction models

A transaction groups database work under specified commit, isolation, and recovery rules. Correct application logic and suitable constraints are still required.