The handling and installation of an Exadata Database Machine rack require caution and adherence to recommended guidelines:
Shipping Brackets: Shipping brackets are specifically designed for transportation purposes and should not be reused for permanent installation. Permanent floor mounting should use approved rack-mounting equipment to ensure stability and safety .
Steering and Pushing the Rack: Exadata racks should be steered from the rear due to fixed front casters. It is critical to avoid pushing the rack from the side panels, which could cause it to tip over, presenting a serious safety risk. This careful movement ensures safe positioning and prevents damage to the equipment during installation.

Options A, D, and F are available for database consolidation on Exadata. Option A refers to the use of multiple pluggable databases in one or more container databases on either a Virtual Machine or Bare Metal cluster. Option D refers to the use of multiple databases spanning a Bare Metal and Virtual Machine cluster to provide resource isolation and consolidation concurrently. And finally, Option F refers to the use of multiple Virtual Machine clusters supporting a single database for greatest resource isolation. This is referenced in the Oracle Exadata Database Machine X9M Implementation Essentials Official Textbook, which is available online at https://docs.oracle.com/cd/E80437_01/E80437/html/index.html.

The two statements that are true about enabling write-back flash cache are:
When enabling write-back flash cache in a rolling manner, DBCLI should be used to inactivate the grid disks on all cells first.
Before write-back flash cache is enabled, you need to drop the Flash Cache first.
The Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book states that "when enabling write-back flash cache in a rolling manner [1], grid disks need to be inactivated on all cells before enabling write-back flash cache". It also states that "before write-back flash cache can be enabled, the existing flash cache must be dropped".