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QUESTION 26
Storage indexes are unique to the Exadata Database Machine and their primary goal is to reduce the amount 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 values meeting 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 index storage.
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 during the I/O request.
A. 3. 7, 5, 2, 1, 6, and 4
B. 3, 7, 1, 5, 6, 2, and 4
C. 3, 6, 1. 7, 2, 5 and 4
D. 3, 5, 1, 7, 6, 2. and 4
Answer: D
QUESTION 27
Identify four significant changes when a backup of Exadata compute nodes must be performed.
A. application of operating system patches
B. before shutdown to preserve storage indexes
C. application of Oracle patches
D. reconfiguration of significant operating system parameters
E. installation or reconfiguration of significant non-Oracle software
F. storage server rebalancing
G. addition of an Exadata storage expansion rack
Answer: ACDG
QUESTION 28
Which table compression technique will not work on Exadata without licensing the Oracle Advanced Compression Option?
A. COMPRESS
B. COMPRESS BASIC
C. COMPRESS FOR OLTP
D. COMPRESS FOR QUERY
E. COMPRESS FOR ARCHIVE
Answer: C
Explanation:
OLTP Table Compression is a part of the Oracle Advanced Compression option, which requires a license in addition to the Enterprise Edition.
QUESTION 29
After migrating from legacy disk-based configuration, which three approaches would you use to evaluate the 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.
Answer: ACD
Explanation:
A: You wish to determine which database objects are currently cached in Smart Flash Cache. Use the list flashcachecontent CellCLI command to report the objects currently stored in Smart Flash Cache and map these to database object names.
C: IOSTAT can be used to get both DISK and FLASH performance data.
D: Using Storage Cell Metrics to Measure IORM (Exadata IO Resource Manager) Performance Impact Exadata provides a number of performance metrics for each of the Category, Interdatabase, and Intradatabase IORM types. You can find these metric and their descriptions using CellCLI commands. With a representative database workload running and after your IORM plan has been created, use the list metriccurrent or list metrichistory CellCLI command to report your current or historical IORM metrics.
QUESTION 30
You are concerned about how recovery from a failed Exadata Storage Server would work. Which statement is true about the Exadata CELLBOOT USB?
A. Exadata automatically copies OS binaries and configuration files from another cell during patching to sync the internal USB.
B. Regular Exadata Storage Server patches make sure that the internal USB is updated so that it can be used for recovery.
C. Changes to network configuration files are possible without using ipconf.pl as long as all relevant files are updated.
D. Some space from the CELLBOOT USB is used for cache metadata when write back flash cache is enabled.
E. Each patch that is performed on Exadata storage servers requires manual resync of the CELLBOOT USB.
Answer: A
Explanation:
A (not B, not E): Oracle automatically performs backups of the operating system and cell software on each Exadata Storage Server. The contents of the system volumes are automatically backed up and require no Oracle DMA intervention or operational processes. Oracle assumes responsibility for backing up the critical files of the storage cells to an internal USB drive called the CELLBOOT USB Flash Drive.
Note:
The ipconf utility is installed in /opt/oracle.cellos on both the Exadata Storage Servers and Compute Nodes and is symbolically linked to /usr/local/bin/ipconf. ipconf is called at system startup time to set and validate your Exadata server network information.
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