Ensuring ACID Semantics

As a relational database, TimesTen is ACID compliant.

• Atomic: All TimesTen transactions are atomic: Either all database operations in a single transaction occur or none of them occur.

• Consistent: Any transaction can bring the database from one consistent state to another.

• Isolated: Transactions can be isolated. TimesTen has two isolation levels: read committed and serializable, which together with row level locking provide multi-user concurrency control.

• Durable: Once a transaction has been committed, it remains committed.

The following sections detail how TimesTen ensures ACID semantics for transactions:

• Transaction Atomicity, Consistency, and Isolation

• Transaction Consistency and Durability