Aerospike Database 8.1 introduces expression indexes, a feature designed to revolutionize the management and querying of large-scale datasets by allowing developers to index only relevant computed data instead of every record. This innovation addresses the limitations of traditional indexing methods, which can complicate codebases, increase memory usage, and heighten operational costs. By embedding conditional logic directly into the index, expression indexes streamline application logic, reducing the need for redundant computations and excessive memory usage, which results in improved performance and lower costs. For instance, in sectors like AdTech, financial services, and e-commerce, expression indexes can selectively index data, thereby enhancing the efficiency of specific operations such as campaign reach calculations, fraud detection, and product recommendations. This approach not only centralizes logic but also ensures consistency, accelerates query performance, and optimizes resource utilization, making it a valuable asset for businesses managing billions of records.