Online Access Free Oracle.1Z0-083.v2024-11-04.q291 Practice Test (Page 18)

1Z0-083 Exam Question 81

Which two are prerequisites for using FLASHBACK TABLE? (Choose two.)

A.A table's constraints must be disabled before issuing the flashback.

B.A table's indexes must be set to unusable before issuing the flashback.

C.The FLASHBACK ANY TABLE system privilege or the FLASHBACK object privilege must be granted to the table owner.

D.The FLASHBACK ANY TABLE system privilege or the FLASHBACK object privilege must be granted to the user performing the flashback.

E.Row Movement must be enabled on the table being flashed back.

1Z0-083 Exam Question 82

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.Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using synchronous I/O.

C.If an RMAN BACKUP VALIDATE command takes noticeably less than an actual backup, then write I/O is a likely bottleneck.

D.If an RMAN BACKUP VALIDATE command takes roughly the same time as an actual backup, then read I/O is a likely bottleneck.

E.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.

F.Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using asynchronous I/O/

G.Data files with a high value in V$BACKUP_ASYNC_IO.SHORT_WAITS are a potential performance bottleneck when asynchronous I/O is used.

1Z0-083 Exam Question 83

Which two are true about the execution of operating system scripts starting from Oracle Database 19c?
(Choose two.)

A.The sudo password must be specified in a response file.

B.orainstRoot.sh can be executed automatically by the Database installer by using sudo or root credentials.

C.The sudo password can be specified in a response file.

D.The root password cannot be specified in a response file.

E.root.sh can be executed automatically by the Database Installer only if it is provided with root credentials.

F.root.sh can be executed automatically by the Database installer only by using sudo credentials.

1Z0-083 Exam Question 84

Which two are true about the character sets used in an Oracle database? (Choose two.)

A.Unicode is the only supported character set for Oracle databases created using Database Configuration Assistant (DBCA).

B.Single-byte character sets always use 7-bit encoding schemes.

C.Single-byte character sets always use 8-bit encoding schemes.

D.Multibyte character sets allow more efficient space utilization than single byte character sets.

E.Unicode enables information from any language to be stored using a single character set.

F.Single-byte character sets provide better performance than multibyte character sets.

1Z0-083 Exam Question 85

A container database (CDB) contains two pluggable databases PDB1 and PDB2. The LOCAL_UNDO_ENABLED database property is set to FALSE in the CDB. Data file 24 of PDB2 was deleted and you need to restore and recover it. The only RMAN backup that exists was created with the BACKUP DATABASE command while connected to CDB$ROOT. Which three are true? (Choose three.)

A.Data file 24 can be restored and recovered while connected to CDB$ROOT.

B.Data file 24 can be recovered while connected to PDB2.

C.Data file 24 can be recovered only while connected to PDB2.

D.Data file 24 can be recovered while connected to CDB$ROOT.

E.Data file 24 can be restored only while connected to CDB$ROOT.

F.Data file 24 can be restored only while connected to PDB2.

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