Oracle is moving into the market for big customer data by buying BlueKai, which aggregates data on consumers and offers it to marketers via a platform for running targeted marketing campaigns on the Web, offline and on mobile devices. Terms of the deal, which was announced Monday, were not disclosed. BlueKai's software helps manage large stores of customer and audience profile data that can be used in conjunction with various types of marketing software. The company's data marketplace containing hundreds of millions of profiles.