To access the latest updates for Exadata, customers should refer to MyOracle Support, specifically the support document titled Exadata Database Machine and Exadata Storage Server Supported Versions (Doc ID 888828.1). This document contains detailed information on the current versions, patches, and updates available for Exadata systems. It also provides guidance on compatibility, end-of-life details, and any critical updates that may impact the operation of Exadata Database Machines.

In the Exadata X9M-2 configuration:
High Capacity (HC) Storage Server: Each HC storage server is equipped with 4 x 6.4 TB NVMe flash cards. These flash cards serve as a cache layer to accelerate I/O performance, especially for read-heavy and mixed workload environments. This configuration combines large storage capacity with NVMe flash for optimal data processing.
Extreme Flash (EF) Storage Server: Each EF storage server contains 8 x 6.4 TB NVMe flash cards, which provides extremely high IOPS and low latency. This configuration is designed for applications demanding high-performance flash storage, making it suitable for intensive OLTP and analytical workloads.
Database Server Flash Storage: The Exadata X9M-2 database servers themselves do not include flash storage as part of their default configuration, which aligns with option D. However, since option E is correct, we do not include D as the other correct answer.

According to Oracle's documentation1, to set a threshold for a metric on a database server, you need to use the create threshold command with the appropriate parameters. The set threshold command is used to modify an existing threshold2.
Therefore, the command that you should use to generate alerts for such an event is:
dbmcli -e "create threshold ds_temp comparison='>', critical=30" on each database server1

D) ASR can upload configuration metadata to support problem resolution1.
E) ASR Manager opens a service request (SR) automatically after sensors detect hardware faults1
https://docs.oracle.com/cd/E37710_01/doc.41/e23333/toc.htm

To enable the write-back flash cache on an Exadata X9M-8 storage cell, the existing flash cache must be removed before transitioning to a new mode. This is because the flash cache configuration-whether set to write-through or write-back-requires a re-initialization of the flash storage to apply the new caching behavior. The steps are as follows:
Drop the Existing Flash Cache: Before altering the cache mode, any existing flash cache on the cell must be dropped. This clears the existing configuration and allows the system to reallocate flash resources under the new mode. The command for this is:
# cellcli -e "drop flashcache"
Create a New Flash Cache in Write-Back Mode: After dropping the existing flash cache, you can create a new flash cache with write-back mode enabled. This step ensures that the flash cache is configured correctly to handle write operations before they reach disk, thus accelerating write-heavy workloads. The relevant command to set write-back mode is:
# cellcli -e "create flashcache all"
This process will reset the flash cache with the write-back mode enabled, thereby caching both read and write operations effectively.