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1Z0-027 - Oracle Exadata Database Machine Administration Software Release 11.x - BrainDump Information

Vendor Name : Oracle
Exam Code : 1Z0-027
Exam Name : Oracle Exadata Database Machine Administration Software Release 11.x
Questions and Answers : 72 Q & A
Updated On : January 19, 2018
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1Z0-027


QUESTION: 68

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 "engaged" 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 "high", "medium", and "low" 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: 69

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, I


Explanation:

Note:

*Exadata monitors for the number of media and other disk/flash failures (e.g. an I/O write failure due to physical media damage). If there are too many of those, Exadata is 'predicting' that it will soon fail and it takes it out of the system.

*Exadata Server, that runs on the storage cells, monitors disk health and performance. If the disk performance degrades it can put it into proactive failure mode. It also monitors for predictive failures based on the disk's SMART (Self- monitoring, Analysis and Reporting Technology) data. In both cases, the Exadata Server notifies XDMG to take those disks offline.

When a faulty disk is replacedf on the storage cell, the Exadata Server will recrate all grid disks on a new disk. It will then notify XDMG to bring those grid disks online or add them back to disk groups, in case they were already dropped.

*ASM is a critical component of the Exadata software stack. It is also a bit different - compared to non-Exadata environments. It still manages your disk groups, but builds those with grid disks. It still takes care of disk errors, but also handles predictive disk failures. It doesn't like external redundancy and ACFS, but it makes the disk group smart scan capable.


QUESTION: 70

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


  1. If two consumer groups A and B in the PROD database get 10% and 15% respectively of resource allocation, then the percentage of I/O resource would be the same if they got 20% and

    30% respectively, provided that the category plans and inter database plans are unchanged, and consumer groups A and B are still mapped to the same category.

  2. If two consumer groups C and D In the PROD database get 10% and 15% respectively of resource allocation, then the percentage of I/O resource would be the same if they still got 10% and 15% respectively and were remapped to a different category by the DBA, provided that the category plans and Interdatabase plans are unchanged.

  3. If two consumer groups P and Q In the PROD database get 20% and 10% respectively of resource allocation, then the percentage of I/O resource would be the same if they got 10% and

    5% respectively, and the Interdatabase plan has changed, provided that the category plan is unchanged, and consumer groups A and B are still mapped to the same categories.

  4. Log Writer I/O and Control File I/O are high priority I/O managed automatically by IORM.

  5. Database Writer I/O is considered to be the highest priority I/O and is managed based on attributes of the IORM plan.


Answer: C, D


Explanation:

*(not A, Not B)Rules in an interdatabase resource plan specify allocations to databases, not consumer groups.

*IORM Rules

IORM is only "engaged" when needed.

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

/ (Not 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

Note:

*Use IORM metrics to track

/I/O load per Consumer Group (IOPS, MBPS, disk utilization %)

/I/O throttling per Consumer Group


Reference:

Using IORM with Exadata


QUESTION: 71

You plan to migrate a database supporting an an OLTP workload to your Database Machine This is part of a consolidation project and several other databases already exist on the Database Machine. Which three Exadata features may help to improve the performance of this OLTP workload?


  1. Hybrid Columnar Compression

  2. I/O Resource Manager

  3. Smart Flash Cache

  4. Smart Flash Log

  5. Smart Scan

  6. Storage Index


Answer: B, C, D


Explanation: C:

OLTP performance benefits with Exadata

/(D)Smart flash log for low latency commits

/ (C)Smart flash cache for low latency reads. KEEP in Flash for critical objects


QUESTION: 72

You are planning the physical installation of two full rack Database Machines and two full-rack expansion racks. The four racks will be combined into one multi rack system. Which are the two guidelines for installing this configuration in your data Center?


  1. All Database Machines must be placed side by side with no space between them.

  2. All Expansion Racks must be placed side by side with no space between them.

  3. All racks must be placed in such away that the exhaust air of one rack does not enter theairinlet of another

  4. All racks must be placed side by side with no space between them.

  5. All racks must be isolated from each other with at least one meter between them.

  6. Racks may be placed as required in the machine room.

  7. Expansion Racks must be placed side by side at least one meter apart.


Answer: A, C


Explanation:

A:Group related racks together – for example, racks that run acommon database or are part of a common cluster

C:Inadequate cold air flow could result inhigher air inlet temperatures in theservers due to exhaust air recirculation


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