As enterprise data platforms continue to expand in scale, diversity, and operational criticality, the combination of high data velocity, exponential data growth, and increasingly stringent regulatory requirements renders manual governance and ad hoc operational controls both inefficient and error-prone. In response to these pressures, policy-driven automation has emerged as a foundational paradigm for managing end-to-end data lifecycles, fine-grained access control, regulatory compliance, and repeatable operational workflows across heterogeneous, distributed environments. This article synthesizes prior academic research and industry practices published between 2000 and 2018 to examine how declarative, machine-interpretable policies can be systematically translated into automated enforcement actions within modern enterprise data platforms. Drawing on established policy frameworks, rule-oriented and distributed data management systems, and workflow orchestration engines, we present an integrated architectural perspective that spans policy definition, policy decision evaluation, and policy execution. The discussion is grounded in practical, widely adopted database and Big Data technologies including MongoDB, Apache Cassandra, and DataStax Enterprise illustrating how policy-driven automation enables scalable governance, operational resilience, and auditable compliance while preserving the flexibility and performance required by contemporary enterprise data ecosystems.