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NEW QUESTION 1
Examine this IORM plan:
Which two are true concerning this plan?
- A. The Finance database can use at least 45%, but never more than 60%, of the total Flash Cache capacity.
- B. I/Os from the finance database are guaranteed to get a minimum of 45% of the I/O bandwidth if the demand exists, and a maximum of 60% of the I/O bandwidth even if noother databases are doing I/O to the cell, and the demand from the finance database exceeds 60% of the maximum I/O rate of the cell.
- C. If I/Os come from the HR database only, then they may get up to 100% of the I/O bandwidth on the cell.
- D. I/Os from the finance database are guaranteed to get 45% of the I/O bandwidth if the demand is at least 60% of the maximum I/O rate of the cell, but may get 100% of the I/O bandwidth if no other databases are performing I/O to the cell.
- E. If I/Os come from the HR database only, then they may get up to 10% of the I/O bandwidth on the cell.
Explanation: The IORM plan can be configured using the ALTER IORMPLAN command on command- line interface (CellCLI) utility on each Exadata storage cell. It consists of two parameters - dbplan and catplan. While the "dbplan" is used to create the I/O resource directives for the databases, the "catplan" is used to allocate resources by workload category consolidated on the target system.
allocation/share - Specify the resource allocation to a specific database in terms of percentage or shares.
limit - Specify maximum limit of disk utilization for a database.
NEW QUESTION 2
Which three statements are true about bulk data loading capabilities in an X5 Database Machine environment?
- A. DBFS must use the DBFS_DG diskgroup for any DBFS store.
- B. DBFS may be used if Exadata-based shared storage is required to stage data before bulk loading into a database.
- C. DBFS must be used to have a POSIX-compliant shared storage solution that is accessible from the database servers on a Database Machine.
- D. DBFS must be used to bulk load data into a production database on the Database Machine.
- E. ACFS may be used if Exadata-based shared storage is required to stage data before bulk loading into a database.
- F. ACFS must be used to have a POSIX –compliant shared storage solution that is accessible from the database servers on a Database Machine.
- G. ACFS may use the DBFS_DG diskgroup to contain the ADVM volume file.
Explanation: External tables on DBFS file-systems provide the probably the most high-performance way to bulk load data into your database.
Bulk Data Loading
Describe the various options for staging data to be bulk loading into Database Machine Configure the Database File System (DBFS) feature for staging input data files
Use external tables based on input data files stored in DBFS to perform high-performance data loads
NEW QUESTION 3
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.
Explanation: 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.
NEW QUESTION 4
You plan to migrate an Oracle database supporting an online transaction processing (OLTP) workload to an X5 Exadata Database Machine.
The database machine is running database version 220.127.116.11. The source database has these attributes:
Database version: 12.1.0 Byte order: Big Endian Database size: 24 TB
You have decided to perform physical migration using the Transportable Tablespace method.
Examine this list of possible steps to accomplish this task.
1. Create a new 18.104.22.168 Exadata –based database.
2. Export the source system metadata using transportable Tablespace (TTS).
3. Transfer the files to the Database Machine and use the RMAN CONVERT command to change them to the little endian format.
4. Import the metadata into the target database.
5. Use the RMAN CONVERT to change the database files to the little endian format on the source system.
Identify the required steps in the correct order.
- A. 1, 2, 4, 5
- B. 1, 2, 5, 3, 4
- C. 1, 2, 3, 4, 5
- D. 1, 2, 3, 4
- E. 1, 2, 5, 4, 3
- F. 1, 2, 5, 4
Explanation: Step 1: 1. Create a new 22.214.171.124 Exadata –based database.
Step 2: 2. Export the source system metadata using transportable Tablespace (TTS). Step 3: 3. Transfer the files to the Database Machine and use the RMAN CONVERT command to change them to the little endian format.
Step 4: 4. Import the metadata into the target database.
This method is often chosen when migrating between platforms with different endian formats, or in cases where physical re-organization is not necessary.
The transportable tablespace method is generally mu References:https://docs.oracle.com/en/cloud/paas/exadata-cloud/csexa/mig-transportable-tablespace.html
NEW QUESTION 5
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.
Explanation: 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.
NEW QUESTION 6
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.
Explanation: DBFS SecureFiles Store Capabilities include support for file system snapshots. Oracle ACFS includes advanced features such as file system snapshot.
NEW QUESTION 7
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.
Explanation: 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.
NEW QUESTION 8
A file contains a script with several EXACLI commands that must be executed on each cell in an X5 full rack.
The script must run on each cell simultaneously. How would you achieve this?
- A. Copy the script to all cells using the DCLI command and manually execute it on each cell using the DCLI command.
- B. Copy the script to the cells using the EXACLI command and execute the script on all cells using the EXACLI command.
- C. Execute it on all cells using the EXADCLI command specifying the file name containing the EXACLI script.
- D. Copy the script to all cells using the CELLCLI command and execute it on all cells in parallel using the CELLCLI command.
- E. Execute it on all cells using the DBMCLI command specifying the file name containing the EXACLI script.
Explanation: The exadcli utility runs commands on multiple remote nodes in parallel threads.
You can issue an ExaCLI command to be run on multiple remote nodes. Remote nodes are referenced by their host name or IP address. Unlike dcli, exadcli can only execute ExaCLI commands. Other commands, for example, shell commands, cannot be executed using exadcli.
NEW QUESTION 9
Which three statements are true about Automatic Hard Disk Scrubbing and repair on high- capacity storage servers in an X5 Database Machine?
- A. Disk repair is made immediately from Smart Flash Cache for corruption on disk when the corresponding data is clean in the Smart Flash Cache.
- B. Hard disks are scanned every two weeks by default but only when disks are idle.
- C. Hard disks are scanned every two weeks by default in all situations.
- D. Disk repair is made immediately from Smart Flash Cache for corruption on disk when the corresponding data is dirty in the Smart Flash Cache.
- E. Disk repair may be made from another mirror copy if the corrupt area is part of a Normal or High Redundancy Disk Group.
Explanation: The default schedule of scrubbing is every two weeks.
NEW QUESTION 10
Which four statements are true concerning the configuration or use of Enterprise Manager Cloud Control to monitor and manage Exadata Database Machine 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.
Explanation: 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
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.
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.
NEW QUESTION 11
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.
- 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.
Explanation: 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
NEW QUESTION 12
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.
Explanation: 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.
NEW QUESTION 13
Which two must be true for a Smart Scan to occur on a table?
- A. Sessions querying the table must set cell_offload_processing = true.
- B. It must be stored in an ASM diskgroup with a 4MByte AU size.
- C. It must be heap organized.
- D. It must be accessed using direct path reads.
- E. The table must not be compressed.
NEW QUESTION 14
Which two statements are true regarding the use of Auto Service Request (ASR) with an X6 Database Machine?
- A. The database server ILOMs must use SMTP over the management network for notifications to ASR Manager.
- B. The database server ILOMs must have SNMP traps configured to use the management network for notifications to ASR Manager.
- C. The storage server ILOMs must have SNMP traps configured to use the management network for notifications to ASR Manager.
- D. The database server MS process must have SNMP traps configured to use the management network for notifications to ASR Manager.
Explanation: B: Database Server ILOM plug-in
Monitoring databases and their instances, ASM environments, the Grid Infrastructure, and the host software environment are done by Enterprise Manager in the usual way as these are standard targets. But monitoring the hardware for the database servers requires the ILOM plug-in, as there is no Management Server (MS) on the database servers to receive SNMP traps from the ILOM. The plug-in will receive sensor state and availability data from the ILOM including alerts based on pre-set ILOM thresholds.
C: Exadata Storage Server plug-inextends the monitoring of exadata cells in addition to providing a GUI interface. The plug-in uses an SSH connection to the cellmonitor user on the cells and uses list commands only. This is for interactive monitoring. One may also set thresholds using the plug-in which are distinct from any thresholds set using cellcli utility as the celladmin user. For alerts to be sent to the plug-in, SNMP traps are used as follows:
Cell ILOM alerts are sent to the cell Management Server (MS) via an SNMP trap. The MS then send SNMP notifications onward to the plug-in.
Cell alerts flagged by MS itself, such as cell thresholds being exceeded, or ADR software alerts, are sent to the plug-in using SNMP.
NEW QUESTION 15
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.
- 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.
Explanation: 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.
NEW QUESTION 16
Which four are true about Exadata features?
- A. Storage Indexes persist across Exadata storage server reboots.
- B. Data Warehouse workloads will benefit from Smart Flash Cache configured in Write- Through mode.
- C. Hybrid Columnar Compressed tables can be compressed and decompressed on Exadata storage servers.
- D. Hybrid Columnar Compressed tables can be compressed and decompressed on the database servers.
- E. OLTP workloads will benefit from Smart Flash Cache configured in Write-Back mode.
- F. Storage Indexes persist across database server reboots.
Explanation: CD: That 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 logshipping to Data Guard.
E (not B): Use the Write-Back Flash Cache feature to leverage the Exadata Flash hardware and make Exadata Database Machine a faster system for Oracle Database Deployments. Write-through cache mode is slower than write-back cache mode. However, write-back
cache mode has a risk of data loss if the Exadata Storage Server loses power or fails.
F: Storage indexes are not stored on disk; they are resident in the memory of the storage cell servers.
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