Free Access Oracle.1Z1-083.v2022-11-09.q168 Practice Test (Page 33)

Question 156

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.

Question 157

In performance management, which two factors might reduce the ability of an application to scale to a large number of users? (Choose two.)

A.poorly written SQL

B.the number of tablespaces containing tables updated by a transaction

C.poorly trained users who do not commit transactions

D.the number of data files containing extents belonging to tables updated by a transaction

E.issuing multiple savepoints during a transaction

Question 158

Examine the statements that use flashback technologies:
FLASHBACK TABLE customers TO TIMESTAMP TO_TIMESTAMP('2013-02-04 09:30:00', 'YYYYMM-DD HH:MI:SS'); SELECT * FROM customers AS OF SCN 123456; FLASHBACK TABLE customers TO BEFORE DROP; FLASHBACK DATABASE TO TIMESTAMP TO_TIMESTAMP('2013-02-04 09:30:00', 'YYYY-MM-DD HH:MI:SS'); SELECT * FROM customers VERSIONS BETWEEN SCN 123456 AND 123999; ALTER TABLE customers FLASHBACK ARCHIVE; Which set ofstatements depends on the availability of relevant undo data in the undo tablespace?

A.1,2,5

B.1,3,6

C.3,4,5

D.2,3,5,6

Question 159

Choose three. Which three are true about cloning databases into an existing CDB with RMAN?

A.A user with SYSDBA or SYSBKUP must be logged in with RMAN to CDB$ROOT when cloning a PDB.

B.Two or more PDBs can be cloned with the same command.

C.A non-CDB can be cloned into a PDB.

D.The target and auxiliary instance passwords must be the same.

E.A user with SYSDBA or SYSBKUP must be logged in with RMAN to the non-CDB being cloned when cloning a non-CDB.

F.Only one PDB can be cloned at a time.

Question 160

Which two statements are true about the Database Configuration Assistant (DBCA)?

A.It can be used to create a database template from an existing database.

B.It can be used to add a new tablespace.

C.It can be used to copy an existing Oracle database to a new host and apply any patches necessary in the new host.

D.It can configure Automatic Storage Management (ASM) diskgroups.

E.It can generate SQL database creation scripts.

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