1z0-070.oracle. Number: 1z0-070 Passing Score: 800 Time Limit: 120 min.

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1 1z0-070.oracle Number: 1z0-070 Passing Score: 800 Time Limit: 120 min

2 Exam A QUESTION 1 Which three are true about Exadata Smart Flash Log? A. Databases on the Database Machine use Exadata Smart Flash Log by default. B. I/O Resource Manager database plans can be used to enable or disable Exadata Smart Flash Log for individual databases. C. LGWR will not wait for writes to Exadata Smart Flash Log if the write to a disk-based logfile completes first. D. I/O Resource Manager category plans can be used to enable or disable Exadata Smart Flash Log for different I/O categories. E. The use of Exadata Smart Flash Logs is mandatory for support of production databases. Correct Answer: ABC A: Exadata I/O Resource Manager (IORM) has been enhanced to enable or disable Smart Flash Logging for the different databases running on the Database Machine, reserving flash for the most performance critical databases. B: The Exadata I/O Resource Manager (IORM) has been enhanced to enable or disable Smart Flash Logging for the different databases running on the Database Machine. C: Smart Flash Logging works as follows. When receiving a redo log write request, Exadata will do parallel writes to the on-disk redo logs as well as a small amount of space reserved in the flash hardware. When either of these writes has successfully completed the database will be immediately notified of completion. If the disk drives hosting the logs experience slow response times, then the Exadata Smart Flash Cache will provide a faster log write response time. Conversely, if the Exadata Smart Flash Cache is temporarily experiencing slow response times (e.g., due to wear leveling algorithms), then the disk drive will provide a faster response time. This algorithm will significantly smooth out redo write response times and provide overall better database performance. Incorrect Answers: D: Category plans are configured and enabled using the CellCLI utility on the cell. Only one category plan can be enabled at a time. References: QUESTION 2 Which components of an Exadata storage server image, if updated, may require that a patch also be applied to the database servers in an Exadata X6 Database Machine?

3 A. Linux operating system on the storage server B. InfiniBand HCA firmware on the storage server C. Storage server hard disk device drivers D. Storage server flash device drivers Correct Answer: D Exadata patches are intended for and include fixes for both the storage servers and Compute servers, and optionally InfiniBand switches. Patching order You should patch the Exadata Database Machines in the following sequence Oracle GI/RDBMS Homes Exadata Storage Cells Compute nodes Infiniband Switches References: QUESTION 3 Which two statements are true about the use of DBFS, ACFS, and external file systems and components in an X5 Database Machine environment? A. ACFS uses storage in a database on the database machine B. DBFS supports file system snapshots. C. ACFS supports file system snapshots. D. Storage Area Network (SAN) based file systems may be accessed directly from the storage servers in a database machine. E. Oracle Sun ZFS Storage Appliance- based files are not automatically protected by Data Guard. Correct Answer: BC

4 DBFS SecureFiles Store Capabilities include support for file system snapshots. Oracle ACFS includes advanced features such as file system snapshot. References: QUESTION 4 Which two are true about sparse griddisks and their use in disk groups on an X5 Exadata Database Machine? A. Sparse diskgroups must be created using sparse griddisks. B. Sparse diskgroups may be created using a combination of sparse and non-sparse griddisks. C. Sparse diskgroups may not be used for database snapshots. D. Additional space for a sparse griddisk is allocated as soon as newly written data is stored in the flashcache on a cell. E. The virtual size of a sparse griddisk may exceed the physical size of the space occupied by the griddisk. Correct Answer: AE A: A sparse ASM disk group is composed of sparse grid disks. E: Sparse grid disks allocate space as new data is written to the disk, and therefore have a virtual size that can be much larger than the actual physical size. Sparse grid disks can be used to create a sparse disk group to store database files that will use a small portion of their allocated space. Sparse disk groups are especially useful for quickly and efficiently creating database snapshots on Oracle Exadata. Traditional databases can also be created using a sparse disk group. References: QUESTION 5 You installed ASR Manager on a stand-alone server and configured Auto Service Request (ASR) for your X5 Database Machine and its assets. Which three statements are true about this configuration?

5 A. Simple Network Management Protocol (SNMP) traps are used to send notifications from database servers to the ASR Manager. B. Simple Network Management Protocol (SNMP) traps are used to send notifications from storage servers to the ASR Manager. C. When a component fault occurs, fault telemetry is securely transmitted to Oracle via Simple Network Management Protocol (SNMP). D. When a component fault occurs, fault telemetry is securely transmitted to Oracle via HTTPS. E. Simple Network Management Protocol (SNMP) traps are used to send notifications from the Enterprise Manager to the ASR Manager. F. Simple Network Management Protocol (SNMP) traps received by ASR Manager are forwarded to the Enterprise Manager. Correct Answer: BCF B: Oracle ASR Manager only processes SNMP traps that are sent from IP addresses that Oracle ASR Manager recognizes. Example of Exadata Storage Server SNMP Trap This example shows the SNMP trap for an Exadata Storage Server disk failure. The corresponding hardware alert code has been highlighted :59:54 server1.example.com [UDP: [ ]:61945]: RFC1213-MIB::sysUpTime.0 = Timeticks: ( ) 6 days, 1:42:36.31 SNMPv2-SMI::snmpModules = OID: SUN-HW-TRAP-MIB::sunHwTrapHardDriveFault SUN-HW-TRAP-MIB::sunHwTrapSystemIdentifier = STRING: Sun Oracle Database Machine Etc. C (not D): The ASR Manager uses the SNMP GET protocol to query ASR assets for additional fault information. To configure fault telemetry, choose one of the following three options: Add SNMP Trap Destinations Using OneCommand (recommended for new installations) Add SNMP Trap Destinations for Multiple Servers Using the dcli Utility Add SNMP Trap Destinations for a Single Server References: QUESTION 6 Which two statements are true about RMAN incremental level-1 backups for a database running on an X5 Database Machine?

6 A. Block Change tracking (BCT) is not needed for databases in an X5 Database Machine, because ASM automatically does block change tracking when diskgroups are built from griddisks. B. cellsrv filters blocks and returns only those that have changed since the last backup, for databases in archivelog mode. C. cellsrv returns all blocks that have been or might have been changed since the last backup, and RMAN filters the blocks that do not require backup. D. cellsrv filters blocks and returns only those that have changed since the last backup, for databases in noarchivelog mode. E. Block Change Tracking (BCT) is not needed for databases in an X5 Database Machine, because change tracking is done by cellsrv. Correct Answer: DE D: Whenever data blocks change, the Change Tracking Writer (CTWR) background process tracks the changed blocks in a private area of memory. When RMAN performs an incremental backup on the Exadata platform, cellsrv filters out unwanted blocks and sends back only those that have changed since the last level 0 or level 1 backup. E: For the Exadata platform, you may choose to allow cellserv to do all the blocking filtering for incremental backups. Note: RMAN block change tracking is used to improve the performance of incremental backup. The level 0 incremental backup scans the entire database but level 1 incremental backups use the block change tracking file to scan only the blocks that have changed since the last backup. This significantly reduces the amount of reads that are required on the database. References: Expert Oracle Exadata (29 Aug 2015), page 319 QUESTION 7 Which three statements are true about Exadata storage server alerts in an X5 Database Machine? A. Storage server alerts notifications may be sent using SNMP. B. A threshold- based alert gets cleared automatically when the measured value no longer violates the threshold. C. A storage server alert is only ever issued as a warning or at a critical situation. D. Storage server alerts are all stateless alerts. E. Storage server alerts are all stateful alerts. F. Storage server alerts notifications may be sent using SMTP. Correct Answer: ACF

7 Exadata cell (storage server) alerts can be delivered using SMTP or SNMP or both. Although there are three types of storage alerts: informational, warning and critical, they are issued when threshold metrics reached either to warning or critical. Incorrect Answers: B: Stateful alerts are automatically cleared on transition to normal. Stateless alerts are never cleared unless you change the alert by setting the examine by attribute. D, E: Alerts can be stateless or stateful. QUESTION 8 Which two statements are true about the X5 Exadata storage server rescue procedure? A. The rescue procedure can be executed from the CELLBOOT USB flash drive. B. An Exadata storage server automatically enters the rescue environment when it cannot boot from the system area. C. The rescue procedure can be used to repair corruption in an ASM diskgroup. D. The rescue procedure can be used to restore a corrupt system area. E. The rescue procedure must be used to recover from a failed Exadata storage server software upgrade. Correct Answer: AD The rescue procedure is necessary when system disks fail, the operating system has a corrupt file system, or there was damage to the boot area. If only one system disk fails, then use CellCLI commands to recover. In the rare event that both system disks fail simultaneously, you must use the Exadata Storage Server rescue functionality provided on the Oracle Exadata Storage Server Software CELLBOOT USB flash drive. References: QUESTION 9 Which two statements are true about backup performance when using Recovery Manager (RMAN) on an X5 Database Machine? A. Backups are fast because the Infiniband network is faster than fiber channel storage, so RMAN read I/O operations are faster than in traditional storage networks. B. Backups are fast, because physical I/Os operations are reduced by the use of the Storage Index by cellsrv. C. Backups are fast, because data blocks are read from the Database Flash Cache.

8 D. Backups are fast, because all data blocks are read from the Exadata Smart Flash Cache. E. For incremental backups using Block Change Tracking, cellsrv filters blocks and returns only those that have changed since the last backup. Correct Answer: DE D: The storage server software manages the flash cache and can recognize different types of I/O requests so that non-repeatable data access like RMAN backup I/ O does not flush database blocks from the cache. It also prioritizes frequently accessed block types such as redo logs, control files, and index root blocks. E: RMAN block change tracking allows incremental backups to run very quickly and efficiently. With block change tracking, only the areas of the database that have been modified since the last incremental backup or full backup are read from disk. Incorrect Answers: C: Database Flash Cache is separate from Exadata Smart Flash Cache. The Database Smart Flash Cache feature and increase the buffercache of your database from like 100G or 200G to G on that same server. References: QUESTION 10 In which scenario will griddisks residing on the same celldisk have balanced performance characteristics in an X5 High Capacity Exadata Storage Server? A. griddisks on memory based celldisks B. griddisks on hard disk-based celldisk consumed by ASM when creating diskgroups using ASM-based Intelligent Data Placement (IDP) C. griddisks on hard disk-based celldisks consumed by the Database Smart Flash Cache D. griddisks on Flash-based celldisks Correct Answer: B Intelligent Data Placement enables you to specify disk regions on Oracle ASM disks for best performance. Using the disk region settings, you can ensure that frequently accessed data is placed on the outermost (hot) tracks which have greater speed and higher bandwidth. In addition, files with similar access patterns are located physically close, reducing latency. Intelligent Data Placement also enables the placement of primary and mirror extents into different hot or cold regions. References:

9 QUESTION 11 You are in the process of upgrading your X5 Database Machine half rack to a full rack. The new storage servers are called DM01CEL08 through DM01CEL14. After creating 96 new griddisks, you issued this SQL statement: How many failgroups if any, will be added to the DATA diskgroup by executing this SQL statement? A. 0, because the new griddisks will be added to the existing failgroups B. 12, consisting of seven griddisks each C. 96, consisting of seven griddisk each D. 7, consisting of 12 griddisks each

10 E. 1, consisting of all 96 griddisks Correct Answer: D The number of failure groups equals the number of Exadata Cells. Each failure group is composed of a subset of grid disks in the Oracle ASM disk group that belong to a single storage cell. References: QUESTION 12 You plan to migrate an Oracle database that supports an online transaction processing (OLTP) workload to your X6 Database Machine. The Database Machine database version is You plan to perform a physical database migration using Transportable Database. Which two are requirements for this method? A. The source database must be deployed on a Little Endian platform, B. The source database must be at least C. The source database must be at least D. The source database must use only bigfile tablespaces. E. The source database must be deployed on a Big Endian platform. F. The source database must not use bigfile tablespaces. Correct Answer: AC Transportable database approach (TDB). If the source system is running Oracle 11.2 or above with Little Endian format, this method can be used to migrate the database to Exadata. References: QUESTION 13 Which four statements are true concerning the configuration or use of Enterprise Manager Cloud Control to monitor and manage Exadata Database Machine

11 components? A. Computer nodes forward their SNMP traps to the Management Server process on the same computer node. B. Storage nodes forward their SNMP traps to the Management Server process on the same storage node. C. Cloud control can monitor and manage a Database Machine compute node expansion rack. D. Oracle management agents must only be installed on one storage node in a Database Machine to enable monitoring and management of all storage nodes. E. Cloud Control cannot monitor partitioned Exadata Database Machine systems. F. Cloud Control can monitor and manage a Database Machine storage Expansion rack. G. Oracle management agents must only be installed on one compute node in a Database Machine to enable monitoring and management of all compute nodes and storage nodes. Correct Answer: BCFG B (not A): Oracle Exadata components including database and storage servers, switches, and power distribution units (PDUs) use SNMP to raise alerts and report monitoring information. Oracle s CellCLI interface is a Java-based framework delivered by the storage cell s management server process (MS) that provides administrative capabilities to your storage server entities. C: Cloud control can monitor the Exadata Database Machine. Figure: Oracle Enterprise Manager Cloud Control 12c monitoring architecture. Note the Management Server process (MS) on the Storage servers.

12 G (not D): Before using Oracle Enterprise Manager Cloud Control 12c with Oracle Exadata, an Oracle Management Agent and Oracle Exadata plug-in must be installed on every Oracle Exadata database server (compute node). This agent monitors software targets, such as the database instances and Oracle Clusterware resources, on the database servers. The plug-in enables monitoring of other hardware components in Oracle Exadata, including the storage servers, switches, and power distribution units. References: QUESTION 14 Identify two supported modifications to an X5 Database Machine. A. installing a Host Bus Adapter (HBA) in the compute nodes B. installing additional Operating System (O/S) packages on the computer nodes C. installing additional Operating System (O/S) packages on the Exadata storage servers D. installing a Host Bus Adapter (HBA) in the storage servers E. replacing the Cisco Ethernet switch with another make or model F. replacing the Infiniband switches with another make or model Correct Answer: BD

13 B: Updating Exadata Database Servers (compute nodes). The software and firmware components that are updated for a specific release depend on the current Exadata software release the database server is running and the release you are updating to. Linux operating system packages and Exadata software are always updated while firmware may be updated for only a small selection of the components or not at all. D: The storage cells (storage servers/nodes) contain HBAs, and spare PCI I/O slots. References: QUESTION 15 You are designing the monitoring architecture and procedures for an X5 Database Machine fabric consisting of two full racks, to provide for the monitoring for all components on the critical path of the admin network. Which two components need to be monitored? A. the Infiniband leaf switches B. the power distribution units C. the Cisco 48 port Catalyst Ethernet Switch D. the InfiniBand spine switches Correct Answer: CD The Cisco Catalyst 4948 Ethernet switch is supplied with the Oracle Exadata Rack. D: Figure: Running the Subnet Manager in Different Rack Configurations

14 References: QUESTION 16 Which two statements are true about Auto Service Request (ASR) with an X5 Database Machine? A. ASR Manager must be installed and configured on a dedicated server external to the Database Machine. B. Configuring ASR is mandatory for all Database Machine assets. C. ASR Manager opens a service request (SR) automatically after sensors detect hardware faults. D. ASR Manager must be installed and configured on one of the database servers. E. ASR can upload configuration metadata to support problem resolution.

15 F. ASR communicates with Oracle support services using HTTPS. Correct Answer: AC A: Oracle recommends that you install Oracle ASR Manager on an external, standalone server. C: Oracle ASR is designed to generate Oracle service requests automatically when certain types of faults are detected on Oracle products that are qualified for Oracle ASR. Oracle ASR works only for specific component faults. Most of the common components, such as disks, fans, and power supplies, are covered. However, some components are not covered. For example, Oracle ASR does not cover InfiniBand events; there are specific images and specific InfiniBand switch firmware that you must use. You cannot upgrade these components independently. Incorrect Answers: D: Oracle recommends that you install Oracle ASR Manager on an external, standalone server. References: QUESTION 17 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? A. During backups, data blocks are always read from Smart Flash Cache by cellsrv. B. During restores, data blocks read from the media are sent to a database server that sends the blocks to cellsrv to be written. C. During backups, data blocks are read by cellsrv and sent to a database server, which sends the blocks to the media manager to be written to media. D. During backups, data blocks are read by cellsrv and sent directly to the media manager to be written to media. E. During restores, data blocks read from the media are sent directly to cellsrv to be written. Correct Answer: DE The fastest database backup is achieved via InfiniBand. Get dedicated Media Servers that connect to tape library Offers backup rates of up to 12GB/sec

16 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: QUESTION 18 Which two statements are true about the use of Intelligent Platform Management Interface (IPMI) on an X5 or X6 Database Machine? A. IPMI can be used for server configuration and management on each database server. B. The Baseboard Management Controller (BMC), which supports IPMI, runs as a multithreaded process on the storage server O/S. C. The Baseboard Management Controller (BMC), which supports IPMI, runs as a single-threaded process on the storage server O/S. D. IPMI can be used for server configuration and management on each storage server. Correct Answer: AC A: IPMI short for Intelligent Platform Management Interface is an interface standard that allows remote management of a server from another using standardized interface. The servers in the Exadata Database Machine 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 C: Like the KCS interface, the SSIF Interface is only specified as a Single Threaded Interface for standard IPMI commands. That is, the BMC implementation is not expected to process more than one IPMI request at a time. While an implementation is allowed to have a degree of command queuing, for standard IPMI messages the SSIF lacks a Seq field that software can use to match up particular instances of requests with responses. References:

17 QUESTION 19 Which three are true concerning Exadata snapshot databases? A. They are supported on non-container databases. B. They are based on a read-write copy of an existing database. C. They are integrated with the Multitenant architecture. D. They can be created only on sparse ASM disk groups. E. They don t support all Exadata features. F. They can be created on any type of ASM disk group. Correct Answer: ACD A: An Exadata snapshot database can be either a non-container database (non-cdb) or a container database (CDB). Creating an Exadata snapshot database of a CDB enables access to all of the pluggable databases in that container. C: You can create two types of Exadata snapshots, depending on the current setup of your environment: You have a pluggable database (PDB) and want to create a test master from it. You have a container database (CDB) and want to create test masters from all its PDBs, or you have a simple non-container database and want to create a test master from it. D: SPARSE disk group based database snapshots is functionality included in Exadata Storage Software. It requires Exadata Storage Software version and Oracle Database 12c version with bundle patch 5 or later. This feature is designed to work on native Exadata ASM storage disk groups. It uses ASM SPARSE grid disk based thin provisioning where snapshot databases created on a SPARSE disk group need only the space for changes plus some metadata, thereby enabling storage efficient snapshot databases. References: QUESTION 20 In which three situations will a Smart Scan occur on a table for which Smart Scan is possible, assuming that nothing in the environment prevents a Smart Scan? A. The ASM diskgroup containing the table s tablespace has a 4 MByte AU size. B. Executing queries in parallel. C. setting serial_direct_read= true in the session issuing the SQL statements and executing a serial query.

18 D. Having direct path reads used at execution time. E. An update to the table is made identifying the row to be modified by primary key. F. An index range scan occurs for the table. Correct Answer: BCD Whether you get a direct path read & smart scan, depends on the current buffer cache size, how big segment you re about to scan and how much of that segment is actually cached at the moment. This dynamic decision unfortunately can cause unexpected surprises and variance in your report/batch job runtimes. To work around these problems and force a direct path read/smart scan, you can either: (B) Run your query in parallel as parallel full segment scans will use direct path reads, unless your parallel_degree_policy = AUTO, then you may still get buffered reads thanks to the dynamic in-memory parallel execution decision of Oracle 11.2 (C) Run your query in serial, but force the serial direct path reads by setting _serial_direct_read = TRUE (or ALWAYS in ) D: One of the most common Exadata performance problems is that the direct path reads (and thus also Smart Scans) don t sometimes kick in when running full scans in serial sessions. Note: Smart Scan is a subset of Cell Offload Processing and is perhaps the feature that is most highly associated with Exadata. Smart Scan allows Oracle databases to push query information down to the storage level, specifically: Filtration (predicate information) Column Projection Join Filtering Incorrect Answers: F: Objects such as clusters and index organized tables cannot be Smart Scanned. References: QUESTION 21 As part of planning for database consolidation, you grouped your databases into two categories based on different technical and business objectives. Which three statements are true about possible configurations for your Exadata X6 Database Machine fabric? A. The storage grid may be partitioned when deploying a single-rack Database Machine configuration using virtualization. B. The database grid may be partitioned when deploying a multirack Database Machine configuration. C. A single database cluster benefits from accessing multiple storage grids. D. Multiple database clusters may access the same storage grids.

19 E. Multiple database clusters never benefit from accessing a single storage grid. Correct Answer: BCD QUESTION 22 You are patching your Exadata X6 Database Machine by applying a new image to the Storage Servers in a rolling fashion. Your ASM environment on the Database Machine has five diskgroups stored on an unpartitioned Exadata storage grid, with redundancy settings as shown: 1. DATA_DBM1 Normal Redundancy 2. RECO_DBM1 Normal Redundancy 3. DBFS_DG Normal Redundancy 4. DATA2_DBM1 High Redundancy 5. DATA3_DBM1 High Redundancy Which two diskgroups will not suffer from any data loss throughout the patching process even if there is a single disk failure on one of the cells A. DBFS_DG B. DATA3_DBM1 C. DATA2_DBM1 D. DATA_DBM1 E. RECO_DBM1 Correct Answer: DE HIGH redundancy provides protection against 2 simultaneous disk failures from 2 distinct storage servers or 2 entire storage servers. HIGH redundancy provides redundancy during Exadata storage server rolling upgrades. References: QUESTION 23 Which four statements are true about the configuration of Auto Service Request (ASR) for use with an X5 Database Machine?

20 A. ASR Manager software may be installed on one of the database servers in the Database Machine. B. ASR can connect to the Internet using Simple Network Management Protocol (SNMP), using a proxy server. C. ASR Manager can connect to the Internet directly with HTTPS. D. ASR Manager can connect to the Internet with HTTPS using a proxy server. E. ASR can connect to the Internet directly using Simple Network Management Protocol (SNMP). F. ASR Manager software may be installed on a server that is not part of the Database Machine. Correct Answer: ACDF C: If you need to use HTTPS for security purposes, you can set up HTTPS/SSL for the ASR Manager HTTP receiver. D: As part of the registration process for ASR Manager, you can optionally set the ASR Manager to access the internet through a proxy server. References: QUESTION 24 You must replace the battery on the disk controller in three Exadata storage servers and must power off the affected storage servers. Which two commands must you execute to safely power off the storage servers in an X5 Database Machine? A. shutdown -h now on the affected storage servers B. CellCLI> LIST GRIDDISK WHERE STATUS!= inactive C. CellCLI > LIST GRIDDISK ATTRIBUTES name WHERE asmdeactivationoutcome!= Yes D. crsctl stop cluster all on one of the database servers E. CellCLI> ALTER GRIDDISK ALL INACTIVE Correct Answer: CE C: Step 1: Run the following command to check if there are other offline disks CellCLI> LIST GRIDDISK ATTRIBUTES name WHERE asmdeactivationoutcome!= 'Yes' If any grid disks are returned, then it is not safe to take the storage server offline because proper Oracle ASM disk group redundancy will not be intact.

21 E: Step 2: Inactivate all the grid disks when Oracle Exadata Storage Server is safe to take offline using the following command: CellCLI> ALTER GRIDDISK ALL INACTIVE Taking the storage server offline when one or more grid disks are in this state will cause Oracle ASM to dismount the affected disk group, causing the databases to shut down abruptly. QUESTION 25 Which two statements are true about the Enterprise Manager plug-in configuration for the X5 Database Machine? A. There is one plug-in for Cloud Control. B. There are several separate plug-ins for Cloud Control. C. Some components of the Database Machine require SNMP trap forwarders. D. All components of the Database Machine require SNMP trap forwarders. Correct Answer: AC QUESTION 26 Which two are benefits of an active/inactive configured InfiniBand network on Exadata Database Machine X5? A. Improved performance for Oracle Network traffic B. Improved reliability for Cache Fusion RAC network traffic C. Improved reliability when executing Distributed Command Line Interface (DCLI) to run CELLCLI commands D. Improved performance for ASM rebalance network traffic E. Improved performance when executing Distributed Command Line Interface (DCLI) to run CELLCLI commands Correct Answer: BC

22 Active-passive bonding provides reliability through failover. QUESTION 27 Identify two valid reasons for executing an X5 Exadata storage server rescue procedure. A. Accidental loss of all data from all griddisks in a storage server B. Corruption in the /(root) filesystem C. Corruption in a normal or high redundancy ASM diskgroup D. The failure of both physical disks 0 and 1 E. Only the failure of physical disk 1 F. Only the failure of physical disk 0 Correct Answer: BD The rescue procedure is necessary when system disks fail, the operating system has a corrupt file system, or there was damage to the boot area. If only one system disk fails, then use CellCLI commands to recover. In the rare event that both system disks fail simultaneously, you must use the Exadata Storage Server rescue functionality provided on the Oracle Exadata Storage Server Software CELLBOOT USB flash drive. Incorrect Answers: E, F: If only one system disk fails, then use CellCLI commands to recover. References: QUESTION 28 Which three statements are true about the CELLCLI command? A. It can execute commands on multiple storage servers in parallel. B. It has command-line history. C. It requires root privileges to create CELLDISKS and GRIDDISKS. D. It can be executed on storage servers. E. It can be executed using the DCLI utility.

23 Correct Answer: BDE The CellCLI utility supports command-line history. Each Exadata Storage cell can be monitored, configured, and maintained using the cellcli command line interface. The dcli utility facilitates centralized management across an Oracle Exadata Storage Server Software realm by automating the execution of CellCLI commands on a set of cells and returning the output to the centralized management location where the dcli utility was run. References: QUESTION 29 Because of a motherboard failure on an X6 high-capacity Exadata storage server, you must replace the server chassis with a replacement unit. Which are three of the components must you move from the original Exadata storage server to the new Exadata storage server? A. Redundant power supplies B. The host bus channel adaptor C. The USB flash drive D. The four Sun Flash Accelerator PCIe cards E. The 12 physical disks Correct Answer: ADE Remove the following reusable components: Fan modules SAS storage drive cables PCIe cards Power supplies References: QUESTION 30 You issued these commands to all Exadata Storage Servers in an X6 Exadata Database Machine using dcli:

24 alter iormplan objective = off alter iormplan active There are no database or category plans defined. You are suffering I/O performance problems at certain times, which vary by day and week. DSS and batch workloads perform well, but your OLTP workloads suffer poor response times when running at the same time as these other workloads. You must ensure that DSS and batch workloads retain relatively high throughput without causing excessive degradation of OLTP performance. Which statement would you issue to all Exadata Storage Servers to achieve this? A. alter iormplan objective = low_latency B. alter iormplan objective = high_throughput C. alter iormplan objective = balanced D. alter iormplan objective = auto Correct Answer: A When the objective option is set to basic, the database resource plan maximum utilization limits are not enforced. For stricter plan conformance, and enforcement of maximum utilization limits, the objective option must be set to something other than basic. The supported IORM objectives are auto, low_latency, balanced, and high_throughput. The objective may also be changed to low_latency in which case the latency for critical I/Os is very good but there is a significant degradation in scan throughput when both workloads are running concurrently. Incorrect Answers: B: The objective can be changed to high_throughput which will increase the scan throughput at the cost of critical I/O latency. C, D: The recommended objective option is auto which allows IORM to continuously monitor the workloads, and select the best mode based on the active workloads currently on the cells. The objective values of auto and balanced have the same behavior. QUESTION 31 Which three are true concerning Smart Scans? A. The decision to perform a Smart Scan is made by the Optimizer. B. Smart Scans are only possible during full table scans or fast full index scans.

25 C. Smart Scans are possible on Index Organized Tables (IOTs). D. Smart Scans always outperform scans that are not offloaded. E. Smart Scans are possible on heap organized tables. F. Smart Scans are possible on uncompressed B*Tree indexes. Correct Answer: ABF B: In order for queries to take advantage of Exadata s Offloading capabilities, the optimizer must decide to execute a statement with a Full Table Scan or a Fast Full Index Scan. F: Smart Scans can be used for full scanning through B*Tree index segments. References: Expert Oracle Exadata - K. Osborne, et al., (Apress, 2011) BBS, page 346 QUESTION 32 You plan to migrate an existing production database supporting online transaction processing (OLTP) workloads to an X6 Exadata Database Machine. The database currently supports an application requiring fast response times to satisfy stringent business requirements, and most of the application queries use indexed access to tables. For which two cases would you consider dropping indexes that are not used for constraints after the migration to assure that Smart Scans occur? A. if Smart Scan performs better that any type of index scan on the corresponding table. B. if Smart only occur instead of index skip scans on the corresponding table. C. if Smart only occur instead of index range scans on the corresponding table. D. if Smart Scans performs equally well to any type of index scan on the corresponding table. Correct Answer: AC QUESTION 33 Which three are recommended options on an X5 Exadata Database machine, for staging files that will be loaded as external tables?

26 A. on an ACFS file system stored in a staging database on the Database Machine B. a ZFS over NFS file system mounted on a database server where the external table will be accessed C. an Exadata-based ACFS file system on the Database Machine D. a DBFS file system stored in a staging database on the Database Machine E. on local storage on one or more storage servers that are accessible to the database server where the load will be performed Correct Answer: ABE QUESTION 34 Which three are true concerning Hybrid Columnar Compression (HCC) deployed on Exadata storage? A. HCC can be used only when the Exadata Smart Flash Cache is configured in Write-Through mode. B. HCC data is never cached in the Exadata Smart Flash Cache. C. By default, decompression is performed by Exadata Storage Servers. D. Rows residing in HCC compressed segments, are always self- contained in a single database block. E. Rows residing in HCC compressed segments, are always self- contained in a single compression unit. F. Row-level locks are supported on HCC compressed data. Correct Answer: CEF C: The decompression process typically takes place on the Oracle Exadata Storage Server in order to maximize performance and offload processing from the database server. E: A logical construct called the compression unit is used to store a set of hybrid columnar compressed rows. When data is loaded, column values for a set of rows are grouped together and compressed. After the column data for a set of rows has been compressed, it is stored in a compression unit. F: What happens when I update a row on compressed tables? What about locks? BASIC and OLTP: the updated row stays in the compressed block usual Oracle s row-level locks Hybrid columnar: Updated row is moved, as in a delete + insert

27 How to see that? With dbms_rowid package New row is OLTP compressed if possible Lock affects the entire CU that contains the row Note: Oracle s Hybrid Columnar Compression technology is a new method for organizing data within a database block. As the name implies, this technology utilizes a combination of both row and columnar methods for storing data. This hybrid approach achieves the compression benefits of columnar storage, while avoiding the performance shortfalls of a pure columnar format. Incorrect Answers: B: Data remains compressed not only on disk, but also remains compressed in the Exadata Smart Flash Cache, on Infiniband, in the database server buffer cache, as well as when doing back-ups or log shipping to Data Guard. References: QUESTION 35 Which three statements are true about Recovery Manager (RMAN) daily differential incremental backup strategies on an X5 Database Machine for a database having 25% or more of its blocks modified each day and which has an 8 k block size? A. Fast incremental backups when 50% or more of the blocks have changed since the last backup, will run as slowly as normal incremental backup. B. Enabling Block Change Tracking (BCT) on the database can result in reduced consumption of storage network bandwidth. C. Enabling Block Change Tracking (BCT) on the database can result in a reduction of physical I/O on the cells during incremental backups. D. For level-1 backups, Block Change Tracking (BCT) is most beneficial when more than 25 percent of the blocks have changed since the last backup. E. For level-0 backups, Block Change Tracking (BCT) is most beneficial when more than 25 percent of the blocks have changed since the last backup. F. cellsrv returns only blocks that have changed since the last backup. Correct Answer: ACF A: Fast Incremental backups is possible with Block change tracking, which is initially introduced from version 10.2 onwards, by this tool it's very useful to reduce the RMAN incremental backup duration. If the changes are something around 20% then in this situation BCT helps a lot.

28 C: Exadata Storage Server offload capability combined with RMAN block change tracking will efficiently perform large I/Os at the storage-tier level, returning only individual changed blocks for incremental backups and increasing the backup performance of the system. Note: Level 1 backup: A level 1 backup includes only those blocks that have been changed since the "parent" backup was taken. Remember a parent backup may be either a level 0 or a level 1 backup. Block change tracking allows indeed the highest benefit for databases where the changes are not so high, Level 0 backup: A level 0 incremental backup is physically identical to a full backup and it includes every data block in the file except empty blocks. The only difference is that the level 0 backup is recorded as an incremental backup in the RMAN repository, so it can be used as the parent for a level 1 backup. References: QUESTION 36 You plan to consolidate multiple mission-critical databases onto a single rack Exadata X6 database Machine. You do not plan to use virtualization on the database servers. You have identified two database categories, based on differing availability and maintenance objectives. Which two choices will be the best solution? A. Create a single database cluster that accesses a single storage grid. B. Create a single database cluster that accesses multiple storage grids. C. Partition the Exadata storage servers into two separate storage grids. D. Create a single storage grid and share space on the celldisks using Exadata storage realms. E. Partition the database servers into two separate clusters. Correct Answer: BE QUESTION 37 The InfiniBand switches on your X5 Database Machine contain the software version as confirmed using the version command: [root@exampsw ib2 bin] # version SUN DCS 36p version: Build time: Apr :15:19

29 SP board info: Manufacturing Date: Serial Number: NCD3X0178 Hardware Revision: 0x0006 Firmware Revision: 0x0102 BIOS version: NOW1R112 BIOS date: 04/24/2014 Which two tools are useful for monitoring the InfiniBand switches for fan problems and by which users should they be run? A. Run the env_test command on the switches after logging in as the ilom-admin user. B. Run the getfanspeed command on the switches after logging in as root. C. Run the env_test command on the switches after logging in as root. D. Run the showtemps command on the switches after logging in as the ilom-admin user. Correct Answer: CD C: Login as root on IB switch and run, # env_test Example output include: Starting FAN test: Fan 0 not present WARNING Fan 1 running slow rpm 5450 limit 6440 WARNING Fan 2 running slow rpm 5341 limit 6440 WARNING Fan 3 running slow rpm 5341 limit 6440 D: The showtemps command displays internal temperatures for the switch. The following example shows how to display switch temperatures with the showtemps command. # showtemps Back temperature 29 Front temperature 30 SP temperature 36 Switch temperature 52, maxtemperature 56 All temperatures OK #

30 References: QUESTION 38 Which three are true concerning Exadata Smart Flash Cache on X6 Database Machines with High Capacity Storage Servers? A. The keep cache is limited to a maximum of 80% of the total Smart Flash Cache capacity. B. Smart Scan will always use the Smart Flash Cache for all I/Os fast full index capacity. C. Smart Scan will always use the Smart Flash Cache for all I/Os for full table scans. D. Single block reads can benefit from Smart Flash Cache. E. Multiblock reads can benefit from Smart Flash Cache. Correct Answer: BDE D: By default Exadata stores only small I/Os in the Exadata Smart Flash Cache. Small I/Os in most cases are single-block reads. During a full table scan Oracle requests blocks in multiblock lumps (by default 16 blocks), and these are Incorrect Answers: C: Oracle has over time has almost completely eliminated caching of table scan blocks from the buffer cache and why by default Exadata does not cache full table scan blocks in the Exadata Smart Flash Cache. During a full table scan Oracle requests blocks in multiblock lumps (by default 16 blocks), and these are not stored in the Exadata Smart Flash Cache unless you change the CELL_FLASH_CACHE clause for the segment. References: QUESTION 39 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? A. Use a cron job on a database node to run it at regular intervals. B. Use a cron job on each cell to run it at regular intervals. C. Run it once each cell and it will then perform periodic monitoring automatically. D. Create a OS job in Enterprise Manager to run the exachk utility at regular intervals. E. Use exachk to schedule itself to run at regular intervals.

31 Correct Answer: ADE 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: Best practices: Execute the latest version of the exachk utility before and after planned maintenance activities and at least once every month QUESTION 40 Which two are true about the allocation of I/O resources by IORM within the CELLSRV process? A. Database Writer I/O always prioritized over all user I/O. B. 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 P and Q are still mapped to the same categories. C. 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 the interdatabase plans are unchanged. D. 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 interdatabase plans are unchanged, and consumer groups A and B are still mapped to the same category. E. Log Writer I/O and Control File I/O are always prioritized over all user I/O.