Oracle 1z0-902 Online Access

To enable REST access to the MS process, you need to manually enable the REST services on each storage server by running the command cellcli -e "ALTER CELL ENABLE REST" and then configure authentication and authorization to ensure secure access. This is described in detail in the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book (Chapter 8, Securing the Exadata Database Machine).

Exadata storage realms using ASM-scoped security mode allows you to control which database can access which griddisks by creating realms at the ASM level, thereby allowing you to limit the access of each database to the griddisks that it needs to access. This is covered in section 3.15.2 of the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book and Resources [1].

Exadata storage realms using database-scoped security mode allows you to control which database can access which griddisks by creating realms at the database level [1], thereby allowing you to limit the access of each database to the griddisks that it needs to access. This is covered in section 3.15.3 of the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book and Resources [2].

[1]   [2] 

According to the Oracle documentation1, two statements that are true about enabling write-back flash cache are:

Write-back flash cache is on by default for High Capacity Storage Servers in High Redundancy configurations (A). This is because write-back flash cache provides better performance and reliability for data file writes than write-through flash cache.

Before write-back flash cache is enabled, you need to drop the Flash Cache first (D). This is because changing the flash cache mode requires recreating the flash cache with a different configuration.

When preparing a site for an Exadata Database Machine, several precautions ensure both the safety of the installation and the optimal performance of the equipment. These precautions include:

Avoiding High-Interference Equipment: Installing near devices like photocopy machines, which can emit electromagnetic interference (EMI), is not a specified precaution for Exadata installations. However, attention should be given to site requirements for temperature, power, and proper grounding connections .

In contrast, other site requirements include exclusive grounding for Exadata racks, avoiding direct sunlight exposure, and ensuring grounding resistance is less than 10 ohms for shared grounding to minimize electrical risks.