To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Requests cannot be deleted if info cubes are compressed.
This option is correct because once an info cube is compressed, it is not possible to delete individual requests from it. Compressing an info cube merges multiple requests into a single request, making it impossible to delete individual requests.
Option B) A request cannot be deleted from an info cube if that request (is compressed) in the aggregates.
This option is incorrect. The ability to delete a request from an info cube is not dependent on whether that request is compressed in the aggregates. The compressing of requests in aggregates does not affect the ability to delete requests from the info cube.
Option C) Deleting a request from the cube will delete the corresponding request from the aggregate if the aggregate has not been compressed.
This option is correct. If an aggregate has not been compressed, deleting a request from the info cube will also delete the corresponding request from the aggregate. This ensures that the consistency between the info cube and the aggregates is maintained.
Option D) All of the above.
This option is incorrect. Option B is incorrect, as explained above. Therefore, the correct options are A and C.
The correct answer is A,C. These options are correct because once an info cube is compressed, individual requests cannot be deleted, and deleting a request from the info cube will delete the corresponding request from the aggregate if the aggregate has not been compressed.