According to one embodiment, a computer system can execute a plurality of threads in parallel. Each thread can process an event in real-time and each event can pertain to a customer transaction. Read-only data can be accessed from a shared memory of an in-memory database. The read-only data can comprise information needed to rate the customer transaction to which the event pertains. Information regarding the processed event can be sent to a commit engine. The commit engine can be configured to update the shared memory according to the processed event, log the information regarding the processed event to a storage device, and store updates to the shared memory in a memory local to the thread.