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Oracle Exadata Database Machine X3 Administration

Question No: 41

Last weekend, an Exadata storage server flashdisk entered the predictive failure state.

The flashdisk is used by the flashcache and has a griddisk which is a member of a normal redundancy diskgroup.

Identify the four steps you must perform to replace this flashdisk.

  1. Identify the griddisk on the predictive failure flashdisk and drop it from the associated ASM diskgroup

  2. Verify that the griddisk located on the predictive failure flashdisk has been successfully dropped from the associated ASM diskgroup.

  3. Drop the flashcache on the cell and re-create it using all but the predictive failure flashdisk.

  4. Safely power off the cell containing the predictive failure flashdlsk.

  5. Replace the predictive failure flashdisk.

  6. Power up the cell containing the replaced flashdlsk and activate all grlddlsks.

  7. Drop the flashcache on the cell and re-create it using all flashdlsks.

  8. Create a new griddisk on the replaced flashdisk.

  9. Add the griddisk back into the ASM diskgroup to which it belonged.

Answer: A,D,E,F

Question No: 42

Consider the following list of software components:

  1. DCLI

  2. Management Server (MS)

  3. ASM Instance

  4. RDBMS instance

  5. Restart Server (RS)

  6. Cellcli

  7. Cell Server (CELLSRV)

  8. Diskmon

    Identify the location where these software components may run in the standard Database machine deployment.

    1. 3, 4 and 8 run on the database servers; 1, 2, 5, 6 and 9 run on the Exadata Storage servers.

    2. 4 and 8 run on the database servers; 1, 2, 3, 5, 6 and 7 run on the Exadata Storage servers.

    3. 1, 3 and 4 run on the database servers; 2, 5, 6, 7 and 8 run on the Exadata Storage servers.

    4. 3, 4 and 8 run on the database servers; 1, 2, 5, 6 and 7 run on the Exadata Storage servers.

    5. 3, 4 and 8 run on the database servers; 1, 2, 5, 7 and 8 run on the Exadata Storage servers.

    6. 1, 3, 4 and 8 run on the database servers; 1, 2, 5, 7 and 8 run on the Exadata Storage servers.

Answer: D

Question No: 43

Which three statements are true about the initial storage configuration after the standard deployment of a new database Machine?

  1. The Data_lt;DBM_Namegt; and RECO_lt;DBM_Namegt; ASM diskgroups are built on part of the interleaved griddisks.

  2. The Data_lt;DBM_Namegt; and RECO_lt;DBM_Namegt; ASM diskgroups are built on top of the non-interleaved griddisks.

  3. There is a free space available on the hard disks inside the database servers for possible extension of the /u01 file system.

  4. There is no free disk space available on the hard disk inside the database servers for possible extensions of the /u01 file system.

  5. There is free space available on the flashdisk inside the Exadata storage servers for possible use as flash-based griddisks.

  6. There is no free disk available on the flashdisk inside the Exadata storage servers for possible use as flash-based griddisks.

Answer: B,C,F

Explanation: B( not A): Griddisks are the fourth layer of abstraction, and they will be the Candidate Disks to build your ASM diskgroups from. By default (interleaving=none on the Celldisk layer), the first Griddisk that is created upon a Celldisk is placed on the outer sectors of the underlying Harddisk. It will have the best performance therefore. If we follow the recommendations, we will create 3 Diskgroups upon our Griddisks: DATA, RECO and SYSTEMDG.

Note:

  • non-root partition (/u01).

  • Oracle Database files: DATA disk group.

  • Flashback log files, archived redo files, and backup files: RECO disk group.

    Question No: 44

    Identity the resource bottleneck for which QoS Management can generate recommendation?

    1. CPU resource bottlenecks

    2. Global Cache resource bottlenecks

    3. I/O resource bottlenecks

    4. Network resource bottlenecks

    Answer: A

    Question No: 45

    Which three must be true for Smart Scans to be done?

    1. Executing a query in parallel

    2. Setting _serial_direct_read=true in the session issuing the SQL statements

    3. Having direct path reads used at run time

    4. Having a 4 meg AU size for the ASM diskgroup containing the tablespace in which tables accessed by a query are stored

    5. Cell_offload_process = true for the ASM diskgroup containing the tablespace in which tables accessed by a query are stored.

    6. cell.smart_scan_capable=true for the ASM diskgroup containing the tablespace in which tables accessed by a query are stored.

      Answer: B,C,F

      Question No: 46

      You are in the planning stage of the network configuration for your Database Machine. The requirements are:

      1. A fault-tolerant network, providing higher availability for connections to database instances

      2. Fault tolerance providing higher availability for connections to perform management functions on the database and storage servers.

      3. Full monitoring of all Database Machine components using Enterprise Manager

        Which three components require external Ethernet network cables to connect your existing network infrastructure to your database machine to satisfy this requirement?

        1. Database servers

        2. Exadata storage servers

        3. InfiniBand storage servers.

        4. Power distribution units (PDUs)

        5. Cisco Ethernet switch

    Answer: A,D,E

    Question No: 47

    You are using Hybrid Columnar Compression for a table stored in a tablespace that is contained in an Exadata-based ASM diskgroup. Identify three statements that correctly explain where the compression and decompression can be done.

    1. Decompression can be done on the database servers.

    2. Compression can be done on the Exadata storage servers.

    3. Compression can be done on the database servers.

    4. Decompression can be done on the Exadata storage servers.

    Answer: A,C,D Explanation:

  • decompression

    / Queries run directly on Hybrid Columnar Compressed data does not require the data to be decompressed

    / Data that is required to satisfy a query predicate does not need to be decompressed; only the columns and rows being returned to the client are decompressed in memory

    / The decompression process typically takes place on the Oracle Exadata Storage Server in order to maximize performance and offload processing from the database server.

    Question No: 48

    Which two are true concerning the allocation of I/O resources by the IORM within the CELLSRV process?

    1. Control File I/O is managed automatically at high priority by IORM.

    2. Control File I/O is considered part of the SYSTEM resource Consume group by IORM.

    3. Log Writer I/O to the Smart Flash Log is considered part of the SYSTEM resource consumer group by IORM.

    4. Log Writer I/O to the Smart Flash Log is managed automatically at high priority by IORM.

    5. Database Writer I/O is managed automatically at normal priority by IORM.

    6. Database Writer I/O is considered part of the SYSTEM resource consumer group by IORM.

    Answer: A,E Explanation: Note:

  • IORM Rules

IORM is only quot;engagedquot; when needed.

/ (A) Redo and control file writes always take precedence.

/ (E) DBWR (database writer) writes are scheduled at the same priority as user IO.

/ IORM does not intervene if there is only one active consumer group on one database.

/ Any disk allocation that is not fully utilized is made available to other workloads in relation to the configured resource plans.

/ Background IO is scheduled based on their priority relative to user IO.

/ For each cell disk, each database accessing the cell has one IO queue per consumer group and three background queues.

/ Background IO queues are mapped to quot;highquot;, quot;mediumquot;, and quot;lowquot; priority requests with different IO types mapped to each queue.

/ If no intradatabase plan is set, all non-background IO requests are grouped into a single consumer group called OTHER_GROUPS.

Reference: Using IORM with Exadata

Question No: 49

Which three are true abort Enterprise Manager plug- in configuration for the Database Machine?

  1. There are several separate plug-ins for Grid Control.

  2. There is one plug-in for Cloud Control.

  3. There are several separate plug-ins for Cloud Control.

  4. Some plug-ins require SNMP trap forwarders.

  5. All plug-ins require SNMP trap forwarders.

  6. There is one plug-in for Grid Control.

Answer: A,C,D

Question No: 50

What is the benefit of bonding the client access network configuration?

  1. Improved performance

  2. Improved reliability

  3. Both improved performance and reliability

  4. A Single Client Access Name (SCAN)

  5. Improved monitoring

Answer: B

Reference: Oracle Exadata Database Machine – Backup amp; Recovery Sizing: Tape Backups

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