Free Access Oracle.1Z0-083.v2026-05-24.q248 Practice Test (Page 37)

Question 176

Choose two. When backing up to the Oracle Fast Recovery Area (FRA), you determine that the backup takes too long and suspect a performance bottleneck. Which two are true about diagnosing and tuning these problems?

A.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.

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 takesroughly the same time as an actual backup, then read I/O is a likely bottleneck.F

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

E.If an RMAN BACKUP VALIDATE command takesroughly the same time as an actual backup, then both read and write I/O are likely bottlenecks.

Question 177

Examine this command:
$ rhpctl move database -sourcehome Oracle_home_path -destinationhome
Oracle_home_path
For which two purposes can you use this command? (Choose two.)

A.to switch an existing Oracle Database home to a newer release of Oracle software on the same server

B.to switch to a read-only Oracle home

C.to switch back to the previous Oracle home as part of a rollback operation

D.to switch the Oracle Database home when using a centralized Rapid Home Provisioning server

E.to switch to a patched Oracle Database home

Question 178

Your container database, CDB1, is in local undo mode.
You successfully execute this command while connected to CDB1:
CREATE PLUGGABLE DATABASE pdb1
ADMIN USER pdb1_admin IDENTIFIED BY pdb123 ROLES=(CONNECT)
CREATE_FILE_DEST='/u01/app/oracle/oradata/cdb1/pdb1';
Which three are true about PDB1? (Choose three.)

A.Service PDB1 is created for remote logins to PDB1.

B.It is in mount state after creation.

C.It has no local users.

D.It has the same number of roles as CDB1.

E.It has the same common users defined as does CDB1.

F.It has only local roles.

Question 179

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

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

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

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

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

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

Question 180

Which two are true about monitoring waits for sessions and services?

A.v$session_wait and v$session both contain details of the event on which a waiting session is currently waiting.

B.v$session_wait_class displays waits broken down by wait class only for waiting sessions.

C.v$session_wait and v$session both contain details of the event on which a non-waiting session last waited.

D.v$session_event displays all waits for all past and existing sessions if the wait has occurred at least once for a session.

E.v$service_event displays wait counts for every wait event whether waited on or not, for each service.

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Question 176

Question 177

Question 178

Question 179

Question 180

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