Final answer:
The default cache type to enhance data transformation performance is in-memory cache, which is used to store frequently accessed data in RAM for quick access, thus improving the speed of applications and reducing redundant operations.
Step-by-step explanation:
The default cache type to increase the performance of data transformation occurring in memory is typically the in-memory cache. This caching mechanism stores data in the computer's main memory (RAM) so that it can be accessed much faster than if it were being retrieved from a disk-based storage system.
In-memory caching is used to enhance the performance of applications by keeping frequently accessed data or computation results readily available, reducing the need to perform database queries or expensive calculations repeatedly.
In the context of data processing, many modern systems, including dedicated transformation tools, databases, and data processing frameworks, utilize in-memory caching as a way to optimize performance. It is especially useful when dealing with large volumes of data that require complex data transformations.