1z0-902 Exam Dumps - Oracle Exadata Database Machine X9M Implementation Essentials

According to the Oracle Exadata Database Machine Technical Architecture1, the initial storage configuration after the standard (non-virtualized) deployment of a new Exadata Database Machine with High Capacity storage servers includes two ASM disk groups: DATA_ and RECO_. These disk groups are built on hard disks and flash disks inside the Exadata Storage Servers1.

The correct statements about this configuration are:

Option D: There is free space available on flashdisks inside the Exadata storage servers for possible use for storage indexes. Storage indexes are a feature of Exadata Storage Software that can improve query performance by avoiding unnecessary I/O operations. Storage indexes use a small amount of flash memory to store metadata about data blocks stored on disk1.

Option E: There is free space available on flashdisks inside the Exadata storage servers to configure Exadata Smart Flash Logs. Exadata Smart Flash Logs are another feature of Exadata Storage Software that can improve database performance by using flash memory as an extension of the database redo log buffer. This can reduce latency and increase throughput for redo log writes1.

The two valid reasons are:

corruption in the / (root) filesystem . According to 1, this is one of the scenarios that requires a storage server rescue procedure , because it prevents the storage server from booting up normally . The rescue procedure will re-image the root filesystem with a fresh copy of the operating system and restore the configuration files from a backup1.

the failure of both physical M.2 disks . According to 2, each Exadata Storage Server X9M-2 has two physical M.2 disks that store the operating system and configuration files for the storage server . If both M.2 disks fail , then the storage server cannot boot up or function properly . The rescue procedure will replace the failed M.2 disks with new ones and re-image them with the operating system and configuration files2.

To drop all celldisks on all the storage servers in an X9M-2 quarter rack, you should use the CELLADMIN account, which has the necessary privileges to perform this task. You can use the CELLCLI command-line interface to drop the celldisks. The best way to do this is by calling CELLCLI on all cells using DCLI (Oracle Database Command Line Interface) which allows you to run commands on multiple servers at once. Alternatively, you can use an administrator-created storage server user with appropriate privileges on celldisk objects by calling CELLCLI on all cells using exadcli. It is not recommended to use the CELLMONITOR account, as it has a more limited set of privileges. It is also important to note that EXACLI is not a valid tool for this task

https://docs.oracle.com/en/engineered-systems/exadata-database-machine/dbmmn/maintaining-exadata-storage-servers.html

Oracle Exadata Deployment Assistant (OEDA) offers multiple benefits for configuring and deploying Exadata systems:

Configuration Gathering and Rack File Creation: OEDA simplifies the setup of Exadata environments by collecting system-specific configuration details. It uses this information to generate the Exadata Rack configuration file, which outlines the optimal setup for the particular environment, streamlining the deployment process and ensuring compatibility with Oracle best practices​ .

Lifecycle Management CLI for Exadata Systems: OEDA includes a command-line interface (CLI) that facilitates various lifecycle management tasks, specifically designed for Exadata systems. This CLI helps in automating deployment steps, adjusting configurations, and updating system parameters, tailored specifically for Exadata’s hardware and software environment .

The minimum Exadata System Software version required to support Oracle Exadata X9M is 21.2.0.0.0. This version introduced various enhancements and capabilities tailored for the X9M series, including optimizations for the RoCE network fabric and support for new hardware components .

On Exadata systems, ASM disk group configurations require that:

Grid Disks Must Have Similar Performance Characteristics: Within a disk group, grid disks must not only be of the same size but also need to exhibit similar performance traits. This consistency ensures balanced I/O operations and optimizes the performance for ASM mirroring and striping across disks​.

Sparse Diskgroups: These are specialized virtual objects that reside within the DATA disk group. Sparse diskgroups are used to support snapshots and other space-efficient storage solutions by creating virtual representations of grid disks within an existing disk group without consuming additional physical space​.

These characteristics are fundamental to ensuring that ASM maintains optimal performance and storage efficiency on Exadata platforms.

After running the commands above, the filesystem mounted on /u01 is on the logical volume /dev/mapper/VGExaDb-LVDbOral. So, to add 20G of space to the filesystem mounted on /u01, the command that needs to be run is:

lvextend -L +20G --verbose /dev/mapper/VGExaDb-LVDbOral

This command will extend the logical volume /dev/mapper/VGExaDb-LVDbOral by 20 GB of space. It is important to note that the option --verbose is used to display the progress of the operation.

Oracle Linux 7.9 is the minimum version required to support RoCE and Persistent Memory. This is because Oracle Linux 7.9 includes kernel enhancements that enable RDMA over Converged Ethernet (RoCE) networking and Intel Optane DC Persistent Memory Modules (DCPMM) for Exadata X8M systems3. These features allow faster access latency and higher throughput for database workloads2.