Which of the following is NOT a benefit of using Delta Lake?

Limited scalability is indeed not a benefit of using Delta Lake. In fact, Delta Lake is designed to provide high scalability. It can efficiently handle large volumes of data and is built on top of Apache Spark, which allows it to leverage Spark's distributed processing capabilities. This means that as data grows, Delta Lake can manage an increasing amount of data without significant performance degradation.

In contrast, efficient query processing is a key benefit, as Delta Lake implements features like indexing and data skipping to improve query performance. The unified platform for data management refers to Delta Lake's capability to manage batch and streaming data in a single framework, making it easier for organizations to work with both types of data seamlessly. Scalable metadata handling is another advantage, as Delta Lake uses a transaction log to track changes, allowing it to manage large numbers of files and tables efficiently while maintaining performance.