Which two are true about backup set

多选题

Which two are true about backup set compression using RMAN default compression?

A、

Compressed backups cannot have a section size defined

B、

Unused blocks below the high water mark are backed up

C、

Binary compression adds CPU overhead to backup operations

D、

Compressed backups can be written only to media

E、

Compression can be done only for locally managed tablespaces

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A、

log writer performance

B、

SQL statements

C、

database instance memory management and sizes

D、

general operating system health

E、

database writer performance

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单选题 Examine this configuration

1.CDB1 is a container database running in ARCHIVELOG mode

2.Multple uncommitted transactions are running in CDB1

3.Redo log groups 1 and 2 are INACTIVE

4.Redo log group 3 is the CURRENT group

All members of redo log group 3 are lost before it is archived

Examine these possible steps

1.SHUIDOWN ABORT

2.STARTUP NOMOUNT

3.STARUP MOUNT

4.ALTER DATABASE MOUNT

5.RESTORE DATABASE

6.RECOVER DATABASE NOREDO

7.RECOVER DATABASE UNTIL AVAIABIE

.8.RESTORE ARCHIVELOG ALL

.9.ALTER DATABASE OPEN

10.ALTER DATABASE OPEN RESETLOGS

choose the minimum required steps in the correct order to recover the database

A、

1.3,5,6.9

B、

1,3,5,8,6,10

C、

1.,2,5.7.4,10

D、

1.3,5.7,10

E、

1.,3.5,6.10

F、

1,3.5,6,10

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单选题 How do you configure a CDB for local undo mode?

A、

Open the CDB instance in restricted mode. In CDBSROOT, drop the UNDO tablespace Execute AI TER DAMBASE LOCAL UNDO ON in each PDB. and then restart the CDB instance

B、

Open the CDB instance in restricted mode. In CDB$ROOT, execute ALTER DATABASE LOCAL UNDO ON. create an UNDO tablespace in each PDB, and then restart the CDB instance.

C、

Open the CDB instance in upgrade mode. In CDB&ROOT, execute ALTER DATABASE LOCAL UNDO ON, and fen restart the CDB instance

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Open the CDB instance in upgrade mode. In each PDB, execute ALTER DATABASE LOCAL UNDO ON, create an UNDO tablespace, and then restart the CDB instance

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The universiry tablespace is currently open read/write

The source and destination platforms have the same endian format.

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C、

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B、

FLASHBACK TABLE

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FLASHBACK TRANSACTION

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FLASHBACK DATABASE

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FLASHBACK DATA ARCHIVE

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CDB1_TAB and APPROOT_TAB

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CDB1_TAB only

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V$SESSTAT

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V$SESSION WAIT

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V$SESSION EVENT

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V$SESSION

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