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Which three statements are true about bulk data loading capabilities in an X5 Database Machine environment?
External tables on DBFS file-systems provide the probably the most high-performance way to bulk load data into your database.
Bulk Data Loading
Describe the various options for staging data to be bulk loading into Database Machine
Configure the Database File System (DBFS) feature for staging input data files
Use external tables based on input data files stored in DBFS to perform high-performance data loads
Which two statements are true about data paths used during RMAN backup and restore operations when media management servers use InfiniBand to connect to an X5 Database Machine?
The fastest database backup is achieved via InfiniBand.
RMAN does not back up directly to tape. However, it will integrate with media management software such as Oracle Secure Backup and utilize their capabilities to manage tape libraries.
Exadata Database Machine: The Database Machine contains the databases that need to be backed up. Oracle RMAN is the only mechanism to back up the databases that utilize Exadata Storage Servers as the storage. RMAN processes run on the database servers and interact with the Oracle Secure Backup (OSB) agent, which further interacts with the media management software and enables RMAN to communicate with the tape library.
References:
http://apprize.info/data/oracle_4/6.html
You plan to monitor the ASM configuration on an X5 Database Machine as part of your role supporting Exadata-based ASM diskgroups.
You want to check for potential space problems that take ASM mirroring requirements into account.
Which two values would you monitor from V$ASM_DISKGROUP or by using the ASMCMD LSDG command?
Determine the Amount of Available Space
To increase the size of the disks in a disk group you must either have unallocated disk space available, or you have to reallocate space currently used by a different disk group.
Example: View the space currently used by the disk groups.
SELECT name, total_mb, free_mb, total_mb - free_mb used_mb, round(100*free_mb/total_mb,2) pct_free
FROM v$asm_diskgroup
ORDER BY 1;
The example above shows that the DATAC1 disk group has only about 15% of free space available while the RECOC1 disk group has about 87% free disk space. The PCT_FREE displayed here is raw free space, not usable free space. Additional space is needed for rebalancing operations.
References:
http://docs.oracle.com/cd/E80920_01/SAGUG/exadata-administering-asm.htm#SAGUG20526
Your Exadata X6-2 Database Machine has the exachk utility preinstalled. You decide to use it periodically to validate the installation against Oracle's recommended best practices.
Which three actions could you take to do this?
AD: To schedule exachk, we can create a cron job or we can create a job in Enterprise Manager..
To add an Enterprise Manager job to execute Exachk on a periodic basis. Execute the following steps. First go to
Enterprise, Job, Library. Then create a new OS Command job
E: exachk options include AUTORUN_SCHEDULE, which schedules recurring health checks using the AUTORUN_SCHEDULE daemon option.
References:
http://www.oracle.com/technetwork/database/availability/exadata-health-resource-usage-2021227.pdf
http://docs.oracle.com/cd/E68491_01/OEXUG/automated-daemon-mode-operation.htm
Best practices: Execute the latest version of the exachk utility before and after planned maintenance activities and at least once every month
Which three statements are true about Automatic Hard Disk Scrubbing and repair on high-capacity storage servers in an X5 Database Machine?
The default schedule of scrubbing is every two weeks.
References:
http://docs.oracle.com/cd/E80920_01/DBMMN/maintaining-exadata-storage-servers.htm
