For a company best known for its enterprise databases, buying technology that facilitates speedy access to data is a brilliant move. With a decoupled architecture that can deal with large volumes of information, GoldenGate is a proven platform that should lend much-needed data management acumen to Oracle's capabilities.
Financial details about the deal have not yet come out of either company, so the exact valuation of GoldenGate is unknown. But what is for sure is that there's nothing Oracle needs more than a way to do real-time monitoring and management of data transactions.
It's during those transitional periods that enterprise databases (or any large databases, for that matter) are most vulnerable. By acquiring GoldenGate, Oracle is not only gaining the sexiness of real-time, but they're shoring up an area of weakness for their architecture.