What compression method is enabled by default in Autonomous Database?

The correct answer is Hybrid Columnar Compression. This method is enabled by default in Oracle Autonomous Database because it efficiently reduces the amount of space required for data storage without sacrificing performance. Hybrid Columnar Compression works by storing similar data within the same column, which allows for better compression ratios. This technique is particularly effective for workloads that involve large amounts of data and can significantly improve query performance by minimizing the amount of data that needs to be read from storage.

In addition, Hybrid Columnar Compression can adapt to the varying workloads typical in autonomous database environments, making it a great fit for the dynamic nature of cloud applications. This automated compression process not only optimizes space but also enhances the overall efficiency of database operations, ensuring that users benefit from faster access and reduced storage costs right from the outset.