試験の準備方法-ハイパスレートの1Z0-083勉強資料試験-ユニークな1Z0-083勉強時間

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Oracle Database Administration II 認定 1Z0-083 試験問題 (Q28-Q33):

質問 # 28
While backing up to the Oracle Fast Recovery Area (FRA), you determined the backup is taking too long and suspect a performance bottleneck.
Which three are true about diagnosing and tuning these problems? (Choose three.)

A. If an RMAN BACKUP VALIDATE command takes roughly the same time as an actual backup, then both read and write I/O are likely bottlenecks.
B. Data files with a high value in V$BACKUP_ASYNC_IO.SHORT_WAITS are a potential performance bottleneck when asynchronous I/O is used.
C. If an RMAN BACKUP VALIDATE command takes roughly the same time as an actual backup, then read I/O is a likely bottleneck.
D. Data files with a high value in V$BACKUP_SYNC_IO.DISCRETE_BYTES_PER_SECOND are a potential performance bottleneck when synchronous I/O is used.
E. Setting DBWR_IO_SLAVESto a non zero value can improve backup performance when using asynchronous I/O/
F. If an RMAN BACKUP VALIDATE command takes noticeably less than an actual backup, then write I/O is a likely bottleneck.
G. Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using synchronous I/O.

正解：D、F、G

質問 # 29
Choose three. Which three are true about corrupted data blocks and their recovery in an Oracle Database?

A. If a row lock is held by a nonexistent transaction, the block containing the row is logically corrupt.
B. If a row lock is held by a nonexistent transaction, the block containing the row is media corrupt.
C. DB_BLOCK_CHECKING=TRUE causes a check sum to be added to each data block to help detect physical or media corruption.
D. DB_LOST_WRITE_PROTECT=TYPICAL causes extra logging overhead on the standby database.
E. A media corrupt block is one where the block is not formatted correctly.
F. The ANALYZE TABLE VALIDATE STRUCTURE CASCADE command verifies that each table row has an index entry pointing to it.

正解：A、D、F

質問 # 30
A container database called CDB1is OMF-enabled.
PDB_FILE_NAME_CONVERTis not configured in CDB1.
PDB1was unplugged from CDB1earlier in the week.
Examine this command, which will be executed in CDB1:
CREATE PLUGGABLE DATABASE pdb1
USING '/u01/app/oracle/oradata/pdb1.xml'
SOURCE_FILE_NAME_CONVERT =
('/u01/app/oracle/oradata/', '/u02/app/oracle/oradata/');
Which two are true? (Choose two.)

A. DBMS_PDB.CHECK_PLUG_COMPATIBILITY must be run in CDB1 before executing the command.
B. PDB_FILE_NAME_CONVERT must be set before executing the command.
C. PDB1 must be dropped from CDB1.
D. PDB1 data files already exist in the correct location.
E. /u01/app/oracle/oradata/pdb1.xml does not contain the current locations of data files for PDB1.

正解：C、E

解説：
The question gives the impression that the source files were held at /u01/app/oracle/oradata, but are now physically located at /u01/app/oracle/oradata. The xml description file is still at
/u01/app/oracle/oradata/pdb1.xml
A: FALSE - SOURCE_FILE_NAME_CONVERT is only needed if the XML file does not accurately describe the current location of the pdb's files.
B: FALSE - If pdb1 ran correctly before, it will run correctly now - assuming that no major upgrade of CDB1 has happened.
C: FALSE - PDB_FILE_NAME_CONVERT is needed only when OMF is not used. The question tells us that OMF is enabled.
D: TRUE - The use of the SOURCE_FILE_NAME_CONVERT parameter indicates that the DB files have been moved, so the xml file does not hold the correct locations E: TRUE - Unplugging a database will result in the PDB remaining in a MOUNT state. It is still part of the CDB and will still be backed up etc... After unplugging, a PDB needs to be dropped before a new PDB can be created with the same name.

質問 # 31
How do you configure a CDB for local undo mode?

A. Open the CDB instance in upgrade mode.
In cdb$root, execute alter database local undo on, and then restart the CDB instance.
B. Open the CDB in read-only mode.
In cdb$root, ex cute alter database local undo on, and then change the CDB to read/write mode.
C. Open the CDB instance in restricted mode.
In cdb$root, execute alter database local undo on.
create an undo tablespace in each PDB, and hen restart the CDB instance
D. Open the CDB instance in upgrade mode.
In each PDB, execute alter database local undo on, create an undo tablespace, and hen restart the CDB instance.
E. Open the CDB instance in restricted mode.
In cdb$root, drop the undo tablespace.
Execute alter database local undo on in each PDB and then restart the CDB instance.

正解：A

解説：
https://docs.oracle.com/en/database/oracle/oracle-database/12.2/admin/administering-a-cdb-with-sql-plus.html#GUID-1AAB032F-D13A-4E06-A062-59E0487C2FC5

質問 # 32
Choose three. Which three are true about actions that can or cannot be performed by users with the SYSBACKUP privilege?

A. They can view data from any user-defined tables.
B. They can drop any tablespace.
C. They can view data from any data dictionary view or dynamic performance
D. They can create any table.
E. They cannot create restore points.
F. They cannot drop tablespaces.

正解：B、C、D

質問 # 33
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