In the information-rich world, the increasing technological trends made a powerful impact that implies the explosive growth in Big Data. This discipline constitutes an analysis of massive complex data. Innovative application possibilities of Big Data are smart grid case, electronic-heath, internet of Things (IoT), pubic utilities, transportation and logistics, political services, and government monitoring. Efflorescing concepts in Big Data technologies are Big Data management, Big Data cleaning, Big Data aggregation, imbalanced systems capacities, imbalanced Big Data, and Big Data analytics. Data organization, privacy-preservation, migration of massive Big Data to cloud technology, domain-specific tools, and platform tools for Big Data infrastructures are future scopes. PHD thesis in big data is an interdisciplinary perspective PHD contention that supports to gather pro-founding information, applications, and contradiction of the Big Data technology. The below-displayed list of topics comprises influential research ideas on PHD thesis in big data.