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Actualtests 1z0-485 Archibald 66q

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Exam code: 1z0-485

Exam name: Oracle Exadata Database Machine 2014 Implementation Essentials

1z0-485

QUESTION 1Exadata Database Machine offers an Intelligent Platform Management Interface for the variouscomponents in the Exadata product. Which option is true?

A. IPMI can be used to remotely start and stop servers.B. IPMI can be used to remotely log in to the operating system.C. IPMI commands can be executed by using SNMP traps.D. IPMI settings can be secured by backing up the Oracle Linux installation on the storage system.

Correct Answer: ASection: (none)Explanation

Explanation/Reference:IPMI short for Intelligent Platform Management Interface - is an interface standard that allows remotemanagement of a server from another using standardized interface. The servers in the Exadata DatabaseMachine follow that. It's not an Exadata command but rather a general Linux one.

To power on a cell or database server, issue this from another server:

# ipmitool -H prolcel01-ilom -U root chassis power on

To stop a server, use the shutdown command. To stop immediately and keep it down, i.e.not reboot, execute:# shutdown -h -y now

QUESTION 2Which is the best location to point your customer to, for finding the latest Exadata patches?

A. owner's guideB. Patch database in MyOracle SupportC. MyOracle Support note 888828.1D. MyOracle Support for database patches, ULN for OS patches, and Sun Support for Server and

InfiniBand patches.

Correct Answer: CSection: (none)Explanation

Explanation/Reference:

QUESTION 3A customer has three databases named CC. FIN, and DW. The CC database is for their CallCenter. Evena slight decrease in the response time of the database would mean more people "on hold" in their datacenter. The orders received through the CallCenter are stored in the Finance (FIN) database. Bothdatabases, CC and FIN, serve as sources for the Data Warehouse (DW) database. All databases use thesame Automatic Storage Management (ASM) diskgroup and therefore, the same physical disks onExadata storage. The customer wants to dynamically control the resources that are available for theCallCenter database because this has direct impact on their operations? Which option should beimplemented?

A. DBRM on the CC databaseB. DBRM on all the databasesC. IORM, because DBRM cannot be changed for an existing sessionD. IORM and DBRM

Correct Answer: BSection: (none)Explanation


QUESTION 4Consider the following software changes that are performed manually on a Linux server:

1. Changes for Linux kernel firewall configuration2. Changes for custom performance monitoring tools3. Changes for security scan tools4. Changes for Linux system performance optimization

Which of the software changes listed are permitted on Exadata Storage Servers?

A. 1, 2, 3, and 4B. only 3

'C. noneD. only 2E. only 1 and 2F. only 2 and 3


Explanation/Reference:1: The Storage Server Patch is responsible for keeping our cell nodes always up-to-date, fixing possibleproblems, and this patch includes different component patches, like kernel patches, firmware, operationsystem, etc... for the Storage Server.Incorrect:

3,4: security scan tools changes and Linux system performance optimization changes would be on thedatabase server.

QUESTION 5Which two attributes describe key benefits of the InfiniBand network?


A. All Exadata database servers have a direct path link to each Exadata Storage Server.B. Cell-to-cell communication uses Reliable Datagram Sockets (RDS) over InfiniBand to achieve low

latency.C. Expanding from two Full racks to four only requires adding an external InfiniBand switch to be at the top

of the fat-tree topology.D. Each InfiniBand link provides 10 Gigabits of bandwidth.E. Oracle's interconnect protocol uses direct memory access (DMA) to eliminate buffer copies and reduce

CPU use.

Correct Answer: CESection: (none)Explanation

Explanation/Reference:C: Oracle Exadata is architected to scale-out to any level of performance. To achieve higher performance

and greater storage capacity, additional database servers and Exadata cells are added to the configuration e.g., Half Rack to Full Rack upgrade. As more Exadata cells are added to the configuration, storagecapacity and I/O performance increases near linearly.

E: Oracle's interconnect protocol uses direct data placement (DMA direct memory access) to ensure verylow CPU overhead by directly moving data from the wire to database buffers with no extra data copiesbeing made. The InfiniBand network has the flexibility of a LAN network, with the efficiency of a SAN.

Incorrect:

Not A: The architecture of the Exadata solution includes components on the database server and in theExadata cell. The software architecture for a Quarter Rack configuration is shown below.

Not B: No cell-to-cell communication is ever done or required in an Exadata configuration.

Not D: Each InfiniBand link provides 40 Gigabits of bandwidth

QUESTION 6Which two statements are true about enabling write-back flash cache?

A. When enabling write-back flash cache in a non rolling manner, it is important to ensure thatasmdeactivatonoutcome is set to YES and asmModestatus is set to ONLINE for all grid disks.

B. Before using write-back flash cache, you need to verify the minimum required versions.C. Before write back-flash cache is enabled, you need to drop the Flash Cache first.D. The setting flashCacheMode should be set to writeback by updating cellinit.ora and restarting cellsrv.E. When enabling write-back flash cache in a rolling manner, dcli should be used to inactivate the grid

disks on all cells first.

Correct Answer: BCSection: (none)Explanation

Explanation/Reference:B: Exadata storage version 11.2.3.2.1 is the minimum version required to use this write back flash cacheoption.

C: Steps for Enabling Write back flash cache:

First of all, you don't need the stop CRS or database (This is ROLLING method) ,you can do it cell by cell.

* drop flashcache

* Be sure asmdeactivationoutcome is YES is before disabling grid disk

QUESTION 7Identify three Exadata Storage Server software processes and their purpose?

A. CELLSRV: The Cell Server is responsible for servicing disk I/O and predicate processing offload.B. CELLSRV: The Cell Server is responsible for balancing workload to other storage servers.C. MS: The Management Server is responsible for storage cell management and configuration.D. MS: The Management Server is responsible for starting a local Enterprise Manager agent.E. RS: The Restart Server is responsible for Automatic Storage Management (ASM) instance restart.F. RS: The Restart Server is responsible for CELLSRV and MS monitoring and restart.

Correct Answer: ACFSection: (none)Explanation

Explanation/Reference:Reference: http://www.oracle.com/technetwork/database/exadata/exadata-technical- whitepaper-134575.pdf (page 22)

QUESTION 8Which two statements are true about troubleshooting failed patching activities?

A. Dependency issues found during yum updates require rolling back to a previous release before retrying.B. Bundle patches applied using opatch auto cannot roll back only the database or the grid infrastructure

home.C. Failed OS patches on database servers can be rolled back.D. Failed storage cell patches are rolled back to the previous release automatically.E. Database server OS updates can be rolled back using opatch auto -rollback.F. Dependency issues found during yum updates should be ignored using the force option.

Correct Answer: ADSection: (none)Explanation


QUESTION 9Which two DML operations will add rows compressed by Hybrid Columnar Compression (HCC) to a tablethat is created to use HCC?

A. INSERTB. insert with an append hintC. UPDATED. CREATE TABLE AS SELECT

Correct Answer: BDSection: (none)Explanation

Explanation/Reference:To maximize storage savings with Hybrid Columnar Compression, data must be loaded using datawarehouse bulk loading techniques. Examples of bulk load operations commonly used in data warehouseenvironments are:

* Insert statements with the APPEND hint

* Parallel DML

* Direct Path SQL*LDR

* Create Table as Select (CTAS)

Incorrect:

Not A, Not C: DML operations (INSERT/UPDATE) against a Hybrid Columnar Compressed table/partitioncan reduce the overall compression savings over time since data INSERTED/UPDATED via DMLoperations will not be compressed to the same ratio as data that is bulk loaded.

QUESTION 10Your customer wants to increase the size of the DATA diskgroup on the Exadata systems. The customer iscurrently using 600 GB disks. Which two are the best options that you would recommend?

A. adding a High Capacity Storage expansion rackB. expanding the Exadata rack from a Half Rack to a Full RackC. moving underutilized grid disks from the RECO diskgroup to DATAD. adding a ZFS storage applianceE. adding a High Performance Storage expansion rack

Correct Answer: BESection: (none)Explanation


QUESTION 11What are two choices that a customer must make that impact diskgroup creation?

A. What is the level of redundancy required?B. What OS will be run?C. Where will disk backups be written?D. How many databases will run on the cluster?

Correct Answer: ACSection: (none)Explanation

Explanation/Reference:Once you identify candidate grid disks, use the CREATE DISKGROUP command to create your ASM diskgroups.

Here are some of the more important considerations to think about when creating ASM disk groups onExadata:

* (A) When capacity planning, take your redundancy specification into consideration.Normal

redundancy will have the effect of reducing your usable storage to half the raw capacity, and

high redundancy will shrink it to a third of your raw disk capacity.

* Simplicity is best on Exadata. Using wild-carded CREATE DISKGROUP syntax not only offers the mostterse command syntax, but also ensures your ASM disk groups are spread evenly across your ExadataStorage Server disks.

* Take the time to plan grid disk prefix names and overall grid disk configuration in the context

of your desired ASM disk group design.

* Make sure to set the appropriate compatible.asm and compatible.rdbms attributes when

creating ASM disk groups.

* Whenever possible, use a 4 MB extent size when creating disk groups on ASM storage.

QUESTION 12When would be the best time to run an Exadata health check (exachk)?

A. before patching, before upgrades, before backups, and on a regular basisB. after patching, after upgrades, and after backupsC. only when advised by Oracle SupportD. before and after patching, when advised by Oracle Support, and on a regular basisE. only after a hardware failureF. monthly and after a hardware failure

Correct Answer: DSection: (none)Explanation

Explanation/Reference:#1: Check for updates frequently.

#2: Execute before & after system changes.

#3: Make part of regular planned maintenance

QUESTION 13Which two statements describe correct network configuration for Exadata Database Machine?

A. The InfiniBand network subnet manager runs on all database servers to achieve High Availability.B. Oracle Clusterware communication is configured to use the management network.C. The InfiniBand network interfaces on Linux servers are configured using active- passive bonding.D. Database connections to the SCAN listener route through the Ethernet switch in the Exadata rack.E. Database servers are deployed with three logical network interfaces configured:

management, client access, and private.

Correct Answer: CDSection: (none)Explanation


QUESTION 14How would you execute CellCLI commands and scripts?

A. using SQL*Plus on database nodesB. by CellCLI commands executed on the database nodesC. using third party tools after installing the CellCLI RPM plug-inD. directly executing the commands and scripts on the Exadata storage cellE. remotely by connecting to Port 1521 using SSL


Explanation/Reference:The storage cells in Exadata Database Machine are managed via two tools called CellCLI and DCLI.

QUESTION 15Which two statements are true about migrating your database to Exadata?

A. Because Exadata uses InfiniBand, in order to migrate your database to Exadata, you must haveInfiniBand on the system that you are migrating from.

B. Using Data Guard Physical Standby to migrate from an 11.1 database to Exadata is beneficial becauseit allows you to adopt HCC during migration.

C. ASM and database best practice configuration supplied during Exadata deployment should be retainedduring and after migration,

D. Logical migration methods allow more flexibility than physical methods to change the databasestructure for best performance.

E. All indexes should be dropped when migrating to Exadata.

Correct Answer: CDSection: (none)Explanation

Explanation/Reference:Reference: http://www.slideshare.net/monowar94ru/migrating-databases-to-exadatadatabase-machine

QUESTION 16Which statement is true about Exadata Storage Servers?

A. The Exadata Storage Server automatically deletes old diagnostic and metric files.B. Exadata requires a running database instance on all storage servers and database servers.C. Redundancy for user data stored in a database that is running on Exadata is achieved with RAID5.D. Communication between a database and an Exadata storage flows over low latency 10 Gigabit

Ethernet.E. Exadata uses network affinity to determine which storage server data is written.



QUESTION 17Your customer is hesitant to install the Oracle Configuration Manager in their environment. Give them threeways in which it will benefit their Exadata Database Machine support experience and potentially resolvesome of the issues they are having with the length of time it is taking Oracle to process their ExadataService Requests (SRs).

A. Host information can be gathered and sent to Oracle for license compliance.B. Potential issues can be addressed before they impact operations.C. Priority handling can be extended for SRs, with attached configuration.D. Exadata patching cannot be done successfully without the Oracle Configuration Manager.E. Root cause analysis can be accelerated.

Correct Answer: BCESection: (none)Explanation

Explanation/Reference:Oracle Configuration Manager is used to personalize the support experience by collecting configurationinformation and uploading it to the Oracle repository.

When customer configuration data is uploaded on a regular basis, customer support representatives cananalyze this data and provide better service to the customers. For example, when a customer logs aservice request, he can associate the configuration data directly with that service request (C). Thecustomer support representative can then view the list of systems associated with the customer and solveproblems accordingly.

Some of the benefits of using Oracle Configuration Manager are as follows:

/ Reduces time for resolution of support issues (E)

/ Provides pro-active problem avoidance (B)

/ Improves access to best practices and the Oracle knowledge base

/ Improves understanding of customer's business needs and provides consistent responses and services

QUESTION 18Which Exadata feature eliminates unnecessary data transfers between database nodes and storage?


A. database viewsB. InfiniBand networkingC. Flash CacheD. high performance SAS2 disk drivesE. cell offloading

Correct Answer: ESection: (none)Explanation


QUESTION 19In looking to improve query performance for your Data Warehouse, select the best way that Exadata'sFlash Cache feature can be leveraged?

A. Enable Smart Flash Log.B. Execute alter table ... cell_flash_cache=keep on heavily scanned tables.C. Enable Write Back Flash Cache.D. Create an ASM diskgroup on Flash Cache and move the indexes from disk to Flash.


Explanation/Reference:In earlier releases, database administrators had to mark an object as KEEP to have it cached in flashcache for large scan workloads. This feature primarily benefits table scan intensive workloads such asData Warehouses and Data Marts. Random I/Os such as those performed for Online TransactionalProcessing (OLTP) continue to be cached in the flash cache the same way as in earlier releases.

Note: With the Exadata Storage Server Software 11.2.3.3.0 and above, the Exadata Smart Flash Cachesoftware automatically caches objects read, in large table scans, in the flash cache based on howfrequently the objects are read. Previously, the default behavior was to bypass the flash cache for suchlarge sequential scans.

QUESTION 20Identify the three values to which the cell_flash_cache attribute can be set.

A. readB. WRITEC. KEEPD. DEFAULTE. NONE

Correct Answer: CDESection: (none)Explanation

Explanation/Reference:There are three values the CELL_FLASH_CACHE attribute can be set to. DEFAULT specifies the cacheused for a DEFAULT object is automatically managed as described in the previous section. NONEspecifies that the object will never be cached. KEEP specifies the object should be kept in cache.

Note: The CELL_FLASH_CACHE can be assigned to a database table, index, partition and LOB column.

QUESTION 21High-disk IOPS (I/Os per second) rates are leading to longer execution times. Which three approacheswould you use to improve this scenario?

A. Enable Write-Back Flash Cache due to heavy DBWR usage.B. Enable Write-Back Flash Cache due to heavy LGWR usage.C. Swap hard disks to High Capacity disks.D. Tune the application to reduce I/O requests.E. Leverage IORM to give priority to critical workloads.

Correct Answer: BDESection: (none)Explanation

Explanation/Reference:B (not A): Smart Flash Logging is a recent Exadata enhancement that provides physical disk redo writerelief in times of high LGWR activity; alone, probably not a driver for Exadata.

QUESTION 22When should you use Hybrid Columnar Compression?

A. alwaysB. on large active tables where deeper compression is desiredC. on tables or partitions that have fairly static dataD. on every table where Advanced Compression is not used


Explanation/Reference:It is recommended that HCC be enabled on tables or partitions with no or infrequent DML operations

QUESTION 23When an Exadata Storage Server hard disk failure alert is received, what manual action must you take torestore the system to full redundancy?

A. Replace the disk and run MegaCLI to rebuild the degenerate mirror.B. No manual action is required because Automatic Storage Management (ASM) fast mirror resync is

automaticC. No manual action is required because ASM rebalancing is automatic.D. Replace the disk and manually copy the mirror extents to the new drive.

E. Run RMAN REPAIR FAILURE.


Explanation/Reference:As soon as the Hard Disk failure is noticed by the MS (Management Server) background process on theCell, it will raise an alert that will also be published to Grid Control, if configured. Immediately, due to Pro-Active Disk Quarantine, the ASM-, Grid- and Celldisks get dropped. ASM rebalancing is triggered. You asthe responsible Admin notice the alert and order a replacement Disk resp. use a Spare Disk to plug it intothe Cell after you plugged out the damaged one. The Cell can stay online, because the Hard Disks are hot-pluggable.

No further administrative work to be done, typically.

QUESTION 24You are concerned about how to recover from a failed Exadata Storage Server. What is the best way torecover from a storage cell failure when content in both system disks is lost?

A. Database Machine Administrators should be prepared by creating a backup using dbserver_backup.sh.B. Database Machine Administrators should be prepared by creating a backup to an NFS file location as

described in the owners guide.C. Any USB can be plugged in to create a backup.D. Be sure that you have a backup by running make_cellboot_usb.sh in /opt/oracle.cellos.E. Use the Exadata Storage Server rescue functionality that Is provided on the CELLBOOT USB flash

drive.F. Re-imaging the cell is the only option.


Explanation/Reference:Recovering Storage Cells from Loss of a System Volume Using CELLBOOT Rescue

ProblemYou have either corrupted your system volume images or suffered from simultaneous loss of the first twodisk drives in your Exadata storage cell, and you wish to use the internal CELLBOOT USB drive to recoverfrom failure.

Solution

At a high level, these are the steps you should take:

* Understand the scope of the failure

* Contact Oracle Support and open a Service Request

* Boot your system from the internal CELLBOOT USB image

* Recover your storage cell using the cell rescue procedure

* Perform post-recovery steps and validation

QUESTION 25You are measuring the I/O savings provided by storage indexes for Table A. One of your scripts displaysthe I/O savings as a result of the storage indexes. Which two statements are true?

SQL> select count (*) from transmap.mymap_comp2 where map_id between 400 and 500;COUNT(*)

---------------------------------------103000Elapsed: 00:00:00.08

SQL> select b.name, a.value/1024/1024 valuefrom vSmystat a, vSstatname b,where b.statistic# = a.statistic#and b.nafne in

(cell physical IO bytes eligible for predicate offload', cell physical IO interconnect bytes',cell physical IO bytes saved by storage index',cell physical IO interconnect bytes returned by smart scan') order by 1;

Statistic Value(MB)--------------------------------------------------------------------------------------------- -----------------cell physical IO bytes eligible for predicate offload 2,255 .09 cell physical IO bytes saved by storage index.00cell physical IO interconnect bytes 1.72cell physical IO interconnect bytes returned by smart scan 1.68

A. The storage indexes were disabled using the disable_storage_INDEX Parameter.B. Storage Index data is not on the Cell Server's region index memory structures yet because this

predicate has not been used.C. Since the database was started, no quires were run against this table with the same predicate.D. The storage indexes reduced the amount of physical I/O bytes significantly for this query.

Correct Answer: BCSection: (none)Explanation

Explanation/Reference:* cell physical I/O bytes eligible for predicate offload

Number of bytes eligible for predicate offload, an indication of smart scan

* (not D) cell physical I/O bytes saved by storage indexHere 0.Number of bytes saved by a storage index; this is a reflection of how many physical disk I/O bytes (and byproxy, requests) were saved due to a storage index eliminating candidate blocks

QUESTION 26How does partition pruning, a 11gR2 database feature, help to improve performance on an ExadataDatabase Machine?

A. Partition pruning allows you to reduce a 5 TB I/O operation to a much smaller I/O operation andtherefore, enables a much faster return of information.

B. Using partition pruning can force the optimizer to use that method instead of Smart Scan. Partitioning inExadata should be used wisely

C. Partition pruning is not a supported option in the 11gR2 database code that runs on an ExadataMachine, due to issues with Cost Based Optimizer plans.

D. Partition pruning allows you to reduce the size of the physical table by reducing fragmentation within theindividual tables.

E. Partition pruning allows you to reduce a 5 TB I/O operation to a larger I/O operation and therefore,forces the use of the Smart Scan technology.



QUESTION 27Identify the correct steps required to upgrade a 1/8th rack of Exadata to a 1/4th rack.

A. Remove the doors of the 1/8th rack.Add the new servers.Cable the Database Servers in the rack.Cable the Exadata Storage Servers in the rack.Close the rack.

B. Activate all cores by using a software command.Activate all hard drives and flash drives.Create the grid disks.Expand the Oracle ASM diskgroups.Review the new configuration.

C. Remove the doors of the 1/8th rack.Add an additional Sun Datacenter InfiniBand Switch.Add the new servers.Cable the Database Servers in the rack.Cable the Exadata Storage Servers in the rack.Close the rack.Configure the new hardware.

D. Activate all cores by using a software command.Activate all hard drives and flash drives.


Explanation/Reference:Not A: no need to remove doors.

Not C: No additional Infiband Switch needed.

Note:

* Database Machine Upgrades

* Database Machine Components and Upgradeability

QUESTION 28Which is a best practice for High Availability (HA) in an Exadata environment?

A. Checksums performed on the Exadata Storage Server ensure logical consistency of block content.B. When a standby database is in place, DB_BLOCK_CHECKING is not required and thus not

recommended.C. Oracle Exadata Storage Server Software HARD checks operate transparently after enabling

DB_BLOCK_CHECKSUM on a database.D. Due to the different architecture that Exadata has with storage servers, compared to regular Storage

Area Network, DB_LOST_WRITE_PROTECT need not be set.E. Stretched RAC is the best alternative for Exadata that combines both HA and DR into one.


Explanation/Reference:Exadata storage cells include Oracle Hardware Assisted Resilient Data (HARD) to provide a

unique level of validation for Oracle block data structures such as data block address, checksum.

and magic numbers prior to allowing a write to physical disks. HARD validation with Exadata is

automatic (setting DB_BLOCK_CHECKSUM is required to enable checksum validation). The

HARD checks transparently handle all cases including Oracle ASM disk rebalance operations and diskfailures.Incorrect:

Not A: The checksum is used to validate that a block is not physically corrupt, detecting corruptions causedby underlying disks, storage systems, or I/O systems. Checksums do not ensure logical consistency of theblock contents.

Not B: MAA recommends that you set DB_BLOCK_CHECKING=MEDIUM or FULL on the physical standbyas a minimum practice to prevent the standby from various logical block corruptions.

Not D: The recommendation is:

On the primary database: DB_LOST_WRITE_PROTECT=TYPICAL (default TYPICAL on Exadata) On theData Guard Physical Standby Database:DB_LOST_WRITE_PROTECT=TYPICAL Not E: Protection from a broad range of, but not all disasters

While not a full disaster recovery (DR) solution, an Extended Distance

Oracle RAC or Oracle RAC One Node deployment will provide protection from a broad range of

disasters. For a full DR protection Oracle recommends deploying an Oracle RAC together with a local anda remote Oracle Data Guard setup as described in the Maximum Availability Architecture (MAA).

QUESTION 29Which Exadata feature uses Flash as a parallel write cache to Disk Controller Cache?

A. Exadata DRAMB. InfiniBand network cacheC. high performance SAS disksD. Smart Flash LogE. Hybrid Columnar Compression


Explanation/Reference:Reference: http://www.oracle.com/technetwork/database/availability/databaseawareflash- 2030367.pdf(slide 21)

QUESTION 30The Exadata compute node, exadbs04, has been having issues for some time. The server had to berepaired and you just received a new server. Your LVM snapshot was corrupt and now the compute nodemust be re-image with an Oracle Support installation image. Which three tasks would you need to performto re-image the compute node?

A. Mount the LVM backup image across the network and recover the system.B. Remove exadbs04 from the RAC cluster and all associated Oracle Homes from the central inventory.C. Create a CELLBOOT USB Flash Drive using an external USB drive.D. Reboot the new server using a bootable recovery image from the external USB drive.E. Reconfigure all site-specific settings (host name, IP addresses, NTP server, and so on).

Correct Answer: CDESection: (none)Explanation


QUESTION 31You are asked to enable Write Back Flash Cache for one of your customers X3-2 Full Rack in a rollingfashion. Put the following steps in the right order:

A. Set flashCacheMode to writeback.B. Inactivate all grid disks and shut down cellsrv.C. Drop the Flash Cache.D. Verify that cell for flashcacheMode is writeback.E. Create the Flash Cache.F. Start up cellsrv and activate all grid disks.G. Check grdidksk asmdeactivationoutcome and asmmodestatus for all grid disks to ensure that all grid

disks on all cells are set to Yes and online, respectively.

A. G. B, C, A, F, E, D, and GB. G, A, B, C, F, E, D, and GC. G, C, B, A, F, E, D, and GD. G, E, C, B, F, A, D, and G

Correct Answer: C

Section: (none)Explanation

Explanation/Reference:Steps for Enabling Write back flash cache:

First of all,you don't need the stop CRS or database (This is ROLLING method) ,you can do it cell by cell.

* (C) drop flashcache

CellCLI> drop flashcacheFlash cache owtcel03_FLASHCACHE successfully dropped* (G) Be sure asmdeactivationoutcome is YES is before disabling grid disk

</pre>CellCLI> list griddisk attributesname,asmmodestatus,asmdeactivationoutcome* (B)

CellCLI> alter griddisk all inactive

QUESTION 32Which statement is true about the patching features provided in Platinum Services?

A. Patching services are available for the full software stack up to twice per year.B. Patching support includes Exadata, Exalogic, and Database Appliance.C. Rolling window and complete down time approaches are two options to patching.D. Platinum covers Exadata storage software and firmware patching, but the customer must perform

database patching.


Explanation/Reference:http://www.oracle.com/us/support/library/remote-quarterly-patching-scope-1652890.pdf

QUESTION 33Storage indexes are unique to the Exadata Database Machine and their primary goal is to reduce theamount of I/O required to service I/O requests for Exadata Smart Scan. Put the following steps in order:

1. The Exadata cell services software conducts I/O requests on I MO storage regions.2. cellsrv checks the high and low values, and determines the storage region does not contain any valuesmeeting the predicate.3. The database is started.4. Physical I/O to the region is bypassed if the query selection falls outside the high/low storage indexstorage.5. A query is issued against the MYOBJ_CTRL table that has a predicate OBJECT_ID=1500.6. A subsequent query is Issued against the MYOBJ_CTRL table that has a predicate OBJECT_ID=2234.7. MYOBJ_STATE'S region index is populated with high and low values for the OBJECT_ID column duringthe I/O request.


A. 3. 7, 5, 2, 1, 6, and 4B. 3, 7, 1, 5, 6, 2, and 4

C. 3, 6, 1. 7, 2, 5 and 4D. 3, 5, 1, 7, 6, 2. and 4


Explanation/Reference:3. The database is started.5. A query is issued against the MYOBJ_CTRL table that has a predicate OBJECT_ID=1500.1. The Exadata cell services software conducts I/O requests on I MO storage regions.7. MYOBJ_STATE'S region index is populated with high and low values for the OBJECT_ID column duringthe I/O request.6. A subsequent query is Issued against the MYOBJ_CTRL table that has a predicate OBJECT_ID=2234.2. cellsrv checks the high and low values, and determines the storage region does not contain any valuesmeeting the predicate.4. Physical I/O to the region is bypassed if the query selection falls outside the high/low storage indexstorage.

Note: Example:

Step 1 (step 5 in answer): The first time that each cell's cell services software issued an I/O request toaccess extentsfrom the D14.MYOBJ_UNCOMP table, Exadata populated a region index for each storage index with thehigh and low values found for the OBJECT_ID column, based on the WHERE OBJECT_ID BETWEEN 100AND 200 query predicate.

Step 2 (step 6 in answer) : Subsequent queries against this table generated an iDB message instructingExadata's cell services software to read the same sets of extents as the first query, but in this case theregion indexes would have been populated based on the I/Os read from the first query.

Step 3: (step 2 in answer) Prior to issuing a physical disk read, cellsrv checks the high and low valuesstored in the region index and if it determines that a storage region does not contain any values meetingthe query predicate, bypasses the physical I/O to the region.

QUESTION 34Identify four significant changes when a backup of Exadata compute nodes must be performed.

A. application of operating system patchesB. before shutdown to preserve storage indexesC. application of Oracle patchesD. reconfiguration of significant operating system parametersE. installation or reconfiguration of significant non-Oracle softwareF. storage server rebalancingG. addition of an Exadata storage expansion rack

Correct Answer: ACDGSection: (none)Explanation


QUESTION 35Which table compression technique will not work on Exadata without licensing the Oracle AdvancedCompression Option?

A. COMPRESSB. COMPRESS BASICC. COMPRESS FOR OLTPD. COMPRESS FOR QUERY

E. COMPRESS FOR ARCHIVE


Explanation/Reference:Reference: http://stackoverflow.com/questions/2425589/difference-between-compress- for-all-operations-and-compress-for-oltp

QUESTION 36After migrating from legacy disk-based configuration, which three approaches would you use to evaluatethe efficiency of Exadata Flash Cache?

A. Review the Flash Hit rate via cellcli metrics.B. Compare Optimized Physical Reads and Total Read Requests in Automatic Workload Repository

(AWR).C. Review the IOSTAT data that is gathered from each compute node by OS Watcher.D. Evaluate the Smart Flash Logging efficiency metrics via CellCLI.E. Check I/O latency on large I/O to Temp in AWR.

Correct Answer: ABDSection: (none)Explanation


QUESTION 37You are concerned about how recovery from a failed Exadata Storage Server would work. Whichstatement is true about the Exadata CELLBOOT USB?

A. Exadata automatically copies OS binaries and configuration files from another cell during patching tosync the internal USB.

B. Regular Exadata Storage Server patches make sure that the internal USB is updated so that it can beused for recovery.

C. Changes to network configuration files are possible without using ipconf.pl as long as all relevant filesare updated.

D. Some space from the CELLBOOT USB is used for cache metadata when write back flash cache isenabled.

E. Each patch that is performed on Exadata storage servers requires manual resync of the CELLBOOTUSB.



QUESTION 38Which two migration will result in the least down time for a physical or logical migration of a database withactive users during the migration?

A. using GoldenGateB. using SQL Developer migration toolsC. using Data Guard Physical StandbyD. using cross-platform transportable tablespacesE. using incremental cross-platform RMAN restore


Explanation/Reference:Reference:http://www.oracle.com/technetwork/middleware/goldengate/overview/ggzerodowntimed atabaseupgrades-174928.pdf

QUESTION 39If your customer wants to save storage space by compressing tables that are read frequently but rarelyupdated, which compression technique would you recommend?

A. OLTPB. ARCHIVE HIGHC. QUERY HIGHD. ARCHIVE LOWE. BASIC


Explanation/Reference:The clause "for query" compresses it in hybrid columnar manner. The clause "low" does not compress it asaggressively. So more space is consumed but compression and decompression do not consume as muchCPU. A more aggressive compression can be achieved by replacing the "low" clause with "high". This typeof HCC is known as warehouse compression since it is useful for data warehouses where a lot of data isstored but they are queried frequently.

QUESTION 40Your customer has purchased their brand new Exadata Database Machine X3-2 Full rack to achieve 20-TB-per-hour backups on their 300 TB database.

You have been called to determine why they are not able to achieve even half that rate. Use theinformation in the image below to identify two reasons their backups are still slow.

A. LVM snapshots are not configured properly on the Database Server.B. The Media Server to Tape Library transfer is causing a bottleneck.C. The number of tape drives is causing a bottleneck.D. Exadata backups are being performed using RMAN over the 10 Gigabit Ethernet network.E. The number of database servers is causing a bottleneck.

Correct Answer: BC

Section: (none)Explanation

Explanation/Reference:The following bottlenecks will be reached first if using InfiniBand fabric to media server:

1. Media server to tape library SAN transfer rate

2. Number of tape drives

QUESTION 41Which statement is true about Oracle compression?

A. A non-partitioned table can use Advanced Compression and Hybrid Columnar Compressionconcurrently.

B. A partitioned table can define the use of Advanced Compression or Hybrid Columnar Compression foreach partition.

C. Hybrid Columnar Compression can be defined for a single column.D. A partitioned table can use only Advanced Compression or only Hybrid Columnar Compression.



QUESTION 42Which statement is true about instance caging setup?

A. Instance caging is the right approach to make sure that database instances are not stealing memoryfrom each other.

B. The CPU Resource Manager and IORM need to be enabled to make instance caging to work asexpected.

C. Database instances need to be restarted to make changes to cpu_count effective.D. For a system with 16 threads, the sum of cpu_count for all databases should not be higher than 32 to

prevent oversubscribingE. The init.org parameter resource_manager_plan should be set.


Explanation/Reference:* Enabling Instance Caging1. Manually set dynamic parameter cpu_count on instance level. As default this parameter is set tomaximum number of cpu available on a hosts.

alter system set cpu_count=2;

2. Enable any resource manager plan that manages CPU. Most easy is to turn on defaultOracle planDEFAULT_PLAN.

alter system set resource_manager_plan=DEFAULT_PLAN;

QUESTION 43Your customer would like to use DBFS in their Exadata environment. They are asking you for the keycharacteristic of DBFS on Exadata.

A. DBFS in an Exadata environment is faster than an NFS mount system because of the Smart Scanperformance gains.

B. Tens of thousands of files are the perfect use case for DBFS on Exadata.C. DBFS offers tremendous I/O bandwidth.



QUESTION 44What are the three customer options for hosting the Platinum Services Advanced Support Gateway?

A. Install on Exadata Engineered System.B. Provide individual x86 64-Bit gateway hardware.C. Install in Oracle Virtual Machine with required hardware.D. Install on Oracle Database Appliance.E. Purchase the recommended x86 64-Bit gateway hardware from Oracle.

Correct Answer: BCESection: (none)Explanation

Explanation/Reference:Reference: http://www.oracle.com/us/support/library/advanced-support-gateway-host- reqs-1896462.pdf

QUESTION 45Which statement is true about Enterprise Manager 12c for Exadata?

A. EM Agents are installed on each database and storage node.B. EM Agents should not be installed on Exadata. Remote monitoring is the best practice.C. EM Agents can communicate to storage cells via SSH.D. The Exadata Plug-In for monitoring switches is installed in each EM Agent.E. Storage cells communicate directly to the EM Management Server via SNMP and/or SMTP.


Explanation/Reference:All the code required for monitoring the various Oracle Exadata hardware components has been bundledinto the Oracle Exadata plug-in that is pushed to the agents running on the Oracle Exadata Compute (orDatabase) nodes. Once the plug-in is deployed on the compute nodes, the database machine is ready fordiscovery with Oracle Enterprise Manager.

Incorrect:

Not A: Since agents only run on the compute nodes it is important to assign specific agents to differentOracle Exadata components. Not B: Oracle Exadata Discovery in Oracle Enterprise Manager 12c

QUESTION 46Identify two reasons why using external tables for high performance data loads on Exadata is moreadvantageous than SQL*Loader.

A. Transformations can be applied directly on the file data using SQL or PL/SQL constructions.B. External tables allow transparent parallelization inside the database.C. Parallelizing loads with external tables enables more efficient space management.D. External tables can take advantage of storage indexes to speed up data loads.


Explanation/Reference:Parallelizing loads with external tables enables a more efficient space management

compared to SQL*Loader, where each individual parallel loader is an independent

database sessions with its own transaction.

QUESTION 47A control file tracks the physical components of a database. It is the root file that the database uses to findall the other files used by the database. Because of the importance of the control file, Oracle recommendsthat the control file be __________?

A. size constrained, to prevent size overrunsB. multiplexed, or have multiple identical copiesC. stored on an HA USB Drive, to ensure that it does not get overwrittenD. managed by EM12c, to ensure proper maintenance



QUESTION 48What are three ways to be informed of an Exadata Storage Server disk failure?

A. review of the output of list alerthistory


B. review of the output of select status from vSdatafileC. review of the ILOM logD. alert notifications through email when SMTP notification is configuredE. alert notifications in the Enterprise Manager Exadata Plug-InF. review of database server iostat output

Correct Answer: ADESection: (none)

Explanation

Explanation/Reference:A: A disk status change would be associated with an entry in the storage cell alerthistory.

D: The Cell Alert Delivery Configuration Worksheet allows you to provide SMTP details to allow for e-mailcommunication of various cell alerts and failures.

Incorrect:

Not F: Use the iostat command to report statistics about disk input and output, and to produce measures ofthroughput, utilization, queue lengths, transaction rates, and service time.

QUESTION 49Identify two ways to reduce the risks associated with the software updates that are performed on aproduction Exadata system.

A. Patch all systems at once instead of one at a time.B. Test on an Exadata system that is identical to the production system first.C. Updating an engineered system has no risk.D. Patch on the standby system first by using Data Guard Standby First Patch Apply.E. Create a system-wide firmware and software snapshot first.


Explanation/Reference:Patch Installation and Testing

Guidelines

1. Review patch documentation

· README and referenced Support Notes

2. (B) Validate in test environment

Verify patch installation (HealthCheck Note 1070954.1)

Verify functionality and performance

Automate

Define and test fallback plans

3. Apply in production environment

(D) Data Guard Standby-First Patch Apply

Monitor for regressions

Support Note 1262380.1

QUESTION 50Which two statements appropriately describe the backup and recovery procedures on Exadata?

A. Cell software backup is automatic and cell recovery is accomplished by using a rescue procedure.B. Data stored in a database is backed up and restored by using CellCLI commands.C. Database server software backup is automatic and recovery is accomplished by using a rescue

procedure.D. Data stored in a database is backed up and restored by using RMAN commands.

E. Cell software backup is performed through CellCLI and cell recovery is accomplished by using a rescueprocedure.


Explanation/Reference:A: Your Exadata Storage Servers do not need to be backed up; Exadata automatically backs these upusing a self-maintained internal USB drive.

D: Backup your Oracle databases using Oracle RMAN

QUESTION 51Which two actions are permitted with Exadata Database Machine?

A. replacing the Ethernet switch with an equivalent 1U 48-port Gigabit Ethernet switchB. installing a second Ethernet switch in the Exadata rack for client access network connectivityC. replacing the Sun Data Center InfiniBand Switch 36-spine switch with an InfiniBand Gateway SwitchD. configuring a Linux active-active channel bonding on the database servers by using two 10-Gigabit

Ethernet portE. configuring a Fibre Channel over Ethernet (FCoE) protocol on database servers

Correct Answer: ABSection: (none)Explanation

Explanation/Reference:http://www.oracle.com/technetwork/database/exadata/exadata-dbmachine-x3-2-ds- 1855384.pdf?ssSourceSiteId=ocomen

"Each Exadata Database Machine X3-2 rack has 2U available at the top of the rack which can be used bycustomers to optionally install their own client network Ethernet switches in the Exadata rack instead of insome other rack. Some restrictions apply.

QUESTION 52

Which three statements are true about Automatic Degree of Parallelism (Auto DOP) on Exadata?

A. Auto DOP is an exclusive feature in Exadata, which allows the database optimizer to evaluate eachstatement and run it in parallel without special hints.

B. Auto DOP is disabled by default and must be enabled before SQL statements can take advantage of itsfeatures.

C. Auto DOP is enabled by default on Oracle 11gR2, allowing full use of its features.D. Oracle's Auto DOP algorithms calculate the Degree of Parallelism based on the table's block counts.E. SQL statements that take advantage of Auto DOP am be identified by using data from Oracle

Automatic Workload Repository (AWR) or Enterprise Manager's Monitored SQL Executions page.

Correct Answer: BDESection: (none)Explanation

Explanation/Reference:B (not c): To enable the features in 11g Release 2, use the parallel_degree_policy parameter (by defaultthis stuff is off - parameter is set to manual). For Auto DOP, setting this to limited is sufficient. If you wantmore functionality (in-memory parallel processing and parallel statement queuing parallel_degree_policyshould be set to auto).Incorrect:

Not A:

* What if you don't have Exadata? Chances are that if your system is large enough to warrant Auto DOP, itis similar enough to Exadata to behave nicely with this number.

* Auto DOP is only useful in systems with enough CPUs and disks to make concurrent parallel processingfeasible. It was designed mostly for Exadata, or for systems of similar size. 48 CPUs and 84 disks soundlike a nice start

QUESTION 53Which two statements are true about Exadata memory capabilities?

A. X3-8 can be purchased in a Half Rack configuration with 2 TB of memory.B. X3-2 memory can be expanded to 512 GB per node from 256 GB.C. X3-2 memory can be upgraded to use Flash in the compute nodes.D. X3-8 memory is fixed at 4 TB per a Rack.E. X3-2 can be purchased in a Half Rack configuration with 256 GB per node.

Correct Answer: DESection: (none)Explanation

Explanation/Reference:D: ORACLE EXADATA DATABASE MACHINE X3-8 features include:

160 CPU cores and 4 TB of memory for database processing

E: Database servers X3-2

A third generation was announced in 2012. Each Database Server with

2 x Eight-Core Intel Xeon E5-2690 Processors (2.9 GHz)

128 GB Memory (expandable to 256GB)

QUESTION 54What are two impacts of selecting high redundancy over normal redundancy for your diskgroups?

A. High redundancy provides more usable storage.

B. Normal redundancy provides more usable storage.C. High redundancy gives you better I/O performance.D. High redundancy provides High Availability (HA) during disk failure and rolling Storage Server patchingE. Normal redundancy provides HA during rolling Storage Server patching.



QUESTION 55Identify a recommended configuration to set up Auto Service Request (ASR) for Exadata.

A. Install ASR Manager on Exadata Database Server.B. Install ASR Manager on Exadata Storage Server.C. ASR is not recommended for Exadata; the Oracle Configuration Manager is preferred.D. Install ASR Manager on a Standalone Server.


Explanation/Reference:The recommended configuration is to install the ASR Manager, which receives fault telemetry informationfrom the servers in Oracle Exadata Database Machine, on an external standalone server. This server mustrun Solaris or Linux as the operating system.

QUESTION 56Which three migration options are available when you migrate a database from the Big Endian formatsystem to Exadata?

A. Data Pump Export and ImportB. transportable databaseC. transportable tablespacesD. Data GuardE. Insert as Select

Correct Answer: ACESection: (none)Explanation


QUESTION 57You are calculating the storage capacity that your customer will require on their ZFS Backup Appliance.Identify the set of factors that will affect this calculation.

A. database size, full/incremental cycle, RPO (Recovery Point Objective), and RTO (Recovery TimeObjective)

B. database size, retention period, RPO (Recovery Point Objective), and compressionC. database size, full/incremental cycle, compression, and retention periodD. database size, compression, and backup windowE. full/incremental cycle, retention period, and ZFS Backup Appliance model

Correct Answer: CSection: (none)

Explanation

Explanation/Reference:Note: The Sun ZFS Backup

Appliance has extremely fast backup and restore throughputs, ensuring that backup windows

and recovery time objectives (RTOs) are met by providing timely recovery in the event of a

disaster

Incorrect:

Not A, Not E: compression is a factor

QUESTION 58Why is ASM High redundancy an important configuration choice when rolling Exadata Storage Serverpatching is planned?

A. High redundancy protects from partner disk failure while a cell is offline being updated.B. High redundancy forces ASM rebalance before allowing disks to be taken offline.C. High redundancy speeds up ASM fast mirror resync when a cell is brought back online after patching.D. Normal redundancy provides the same protection during rolling patching, so High redundancy is not

important in this case


Explanation/Reference:To ensure redundancy during a rolling upgrade of the Exadata Storage Server Software, MAArecommends ASM high redundancy disk groups.

QUESTION 59Which two statements are true about CellCLI?

A. Using a CellCLI command, you can change the SNMP subscribers or add multiple SNMP subscribers.B. Using CellCLI, you can stop and start the ASM instances that are using the grid disks on the Exadata

storage cell.C. With a simple CellCLI command, you can synchronize changes to all the storage cells in the Exadata

realm.D. Using a CellCLI command, you can see whether grid disks are being used by ASM or not.E. You cannot use CellCLI to gather the serial numbers of physical disks.


Explanation/Reference:http://docs.oracle.com/cd/E24628_01/doc.121/e27442/ch4_post_discovery.htm "Exadata Storage CellSNMP configuration is performed using the cellcli command and can be run in batch using dcli from acompute node."

QUESTION 60Identify the relevant steps in the correct order for activating an Auto Service Request (ASR) configuration.

1. Add SNMP traps manually or using OneCommand.2. Install ASR Manager.3. Activate a node on ASR Manager.4. Validate the configuration.5. Register ASR Manager with Oracle.

A. 2, 5, 1, 3, and 4B. 2, 4, I, 3, and 5C. 5, 2, 4, 1, and 3D. 5, 4, 2, 1, and 3


Explanation/Reference:2.Install Oracle Auto Service Request (ASR) Packag

5.Register the ASR Manager

1.Add SNMP Trap Destinations for Multiple Servers Using the dcli Utility

3. Activate Node on the ASR Manager

QUESTION 61When running OS Watcher, which two data outputs are valid for Exadata storage cell performanceanalysis? Select the two correct choices that apply?

A. lostatB. mpstatC. netstatD. pkginfoE. label


Explanation/Reference:Example:

# A few find examples

# \( -name "*.*" \) \

# \( -name "*vmstat*.*" -o -name "*iostat*.*" \) \

# \( -name "*vmstat*.*" -o -name "*iostat*.*" \) -mmin -60 \

# \( -name "*vmstat*.*" -o -name "*iostat*.*" -o -name "*netstat*.*" \) -mtime -8 \

QUESTION 62Identify two tasks that the Database Resource Manager can perform, which the I/O Resource Managercannot.

A. Manage I/O based on the application that is connected to the database.B. Manage the number of parallel sessions for a query.C. Manage I/O and CPU between databases on the same cluster or physical database host.D. Terminate database sessions when certain limits have been reached.E. Manage the throughput of an I/O-bound application based on the service name used for the connection.



IORM is similar to Oracle Database Resource Manager (DBRM) in that it provides a means for controllingallocation of system resources. Where DBRM's primary goals are to control CPU resources, limit thedegree of parallelism, and impose resource consumption constraints for different types of sessions withinan Oracle database, IORM's goal is to govern I/O resource allocations between databases on a sharedstorage infrastructure. When consolidating Oracle databases on Exadata, IORM can be used to ensurethat I/O is controlled between databases as well as classifications of consumes that utilize the same ASMdisk infrastructure and, as such, provide resource control capabilities beyond what DBRM provides within adatabase.

/ Using the Database Resource Manager, you can:

* Guarantee certain users a minimum amount of processing resources regardless of the load on thesystem and the number of users

* Distribute available processing resources by allocating percentages of CPU time to different users andapplications. In a data warehouse, a higher percentage may be given to ROLAP (relational on-lineanalytical processing) applications than to batch jobs.

* Limit the degree of parallelism of any operation performed by members of a group of users

etc

QUESTION 63Which three statements accurately describe update of software on Exadata Database Machine?

A. The Oracle Database patchset software (for example, 11.2.0.3) requires the Exadata-specific version.B. Rolling patching is faster than non-rolling patching, but database down time is longer.C. The Oracle Database software on Exadata is updated using standard OPatch and the Oracle Universal

Installer.D. Running Exadata with different storage server software versions is supported, but should be minimized

to rolling patching scenarios.E. The database server operating system software (other than kernel and OFED) may be installed or

updated from non-Exadata sourcesF. Storage server updates require access to an Unbreakable Linux Network (ULN) based repository.

Correct Answer: CDFSection: (none)Explanation

Explanation/Reference:C:

* Oracle offers two utilities for software deployment:

Oracle Universal Installer to install Oracle products

OPatch to apply interim patches

F: When storage cells are patched, there is almost always a set of storage server patches that need to beapplied to the Exadata Compute Nodes as well. Historically, these were called "minimal packs," but recentimprovements to the compute node patching process deliver these updates using yum channels onOracle's Unbreakable Linux Network (ULN).

Incorrect:

Not B: Rolling patching has no downtime.

QUESTION 64Which CellCLI command is used to conclude that a storage server can be taken offline without impactingdatabase availability?

A. LIST GRIDDISK ATTRIBUTES name, asmDeactivationOutcome;

B. LIST CELLDISK ATTRIBUTES name, raidLevel;C. LIST CELL ATTRIBUTES cellsrvStatus, flashCacheMode;D. LIST CELLDISK ATTRIBUTES name, raidLevel, asmModeStatus;E. LIST GRIDDISK ATTRIBUTES name, status;


Explanation/Reference:ASMDeactivationOutcome recall that grid disks can be deactivated, which is effectively taking them offline.Since ASM mirroring ensures that the data is located on another disk, making this disk offline does not losedata. However, if the mirror is offline, or is not present, then making this grid disk offline will result in loss ofdata. This attribute shows whether the grid disk can be deactivated without loss of data. A value of "Yes"indicates you can deactivate this grid disk without data loss.

CellCLI> list griddisk attributes name, ASMDeactivationOutcome, ASMModeStatus

DBFS_DG_CD_02_cell01 Yes ONLINE



... output truncated ...

QUESTION 65What would be the best way to ensure that batch Jobs do not impact performance of online queries thatuse the same database?

A. Configure IORM to disable Flash Cache usage for batch workload.B. Build a Database Resource Management Plan, giving priority to query workload.C. Deploy Instance Caging to control batch jobs.D. Configure and enable Parallel Query.E. Configure resource plans by using the I/O Resource Manager on the storage cells, giving priority to

query workload.


Explanation/Reference:Using the Database Resource Manager, you can distribute available processing resources by allocatingpercentages of CPU time to different users and applications. In a data warehouse, a higher percentagemay be given to ROLAP (relational on-line analytical processing) applications than to batch jobs.

Incorrect:

not C:In addition to controlling I/O utilization on the Exadata storage cells, Oracle also allows you to limit CPUresource utilization on the compute nodes using a technique called instance caging.

QUESTION 66When using IORM, which statement accurately describes when redo log file writes take place?

1. Based on the priority of the user2. Immediately3. Based on the resource group of the user4. Based on the intradatabase resource plan

A.

B.C.D.

Correct Answer: Section: (none)Explanation

Explanation/Reference:Whenever a transaction is committed, the corresponding redo entries temporarily stored in redo log buffersof the system global area are written to an online redo log file.

Note: I/O Resource Manager =IORM

http://download.oracle.com/docs/cd/A58617_01/server.804/a58397/ch5.htm


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