Choose two.Which two are true about

多选题
Choose two.
Which two are true about monitoring waits for sessions and services?

A、 V$SERVICE_EVENT displays wait counts for every wait event for each service even
Including counts of zero for waits that never occurred.

B、 V$SESSION_WAIT and V$SESSION both contain details of the event on which a non-waiting
Session last waited.

C、 V$SESSION_WAIT and V$SESSION both contain details of the event on which a waiting
Session is currently waiting.

D、 V$SESSION_EVENT displays all waits events for those events that have occurred at least
Once for sessions that have now terminated.

E、 V$SESSION_WAIT_CLASS displays waits broken down by wait class only for terminated
Sessions.

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多选题 7.1、choose one
You enable Flashback Data Archive for a table for which you want to track and save all transactions
For four years. After some time, the requirement changes for keeping transactions from four to two
Years.
You execute the following command to change the requirement:
SQL> ALTER FLASHBACK ARCHIVE fdal MODIFY RETENTION 2 YEAR;
What is the outcome?

A、All historical data older than two years, if any, is purged from the flashback archive FDA1.

B、An error is returned because the retention period cannot be reduced.

C、All the flashback data archives are purged and the subsequently created flashback archives are
Maintained for two years.

D、All historical data older than two years, if any, is archived to flashback logs and the flashback
Archive is set to new retention time.

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多选题 1. Which three are true about thresholds, metrics, and server-generated alerts? (Choose three.)

A、 All metrics are instance related.

B、 Cleared stateful alerts are displayed by querying DBA_ALERT_HISTORY.

C、 A space usage management alert is automatically cleared after the underlying problem is
Resolved.

D、 They are generated by SMON when a tablespace is 97% full.

E、 Metrics are statistical counts for a specific unit.

F、 STATISTICS_LEVEL must be set to ALL to generate alerts.

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多选题 5. Which three are true about requirements for various FLASHBACK operations? (Choose three.)

A、 FLASHBACK transaction query requires undo to retrieve all versions of a row that existed between two points in time.

B、 FLASHBACK drop requires that the RECYCLEBIN parameter be set to ON.

C、 FLASHBACK version query requires that the RECYCLEBIN parameter be set to ON.

D、 FLASHBACK DATA ARCHIVE requires undo to store all versions of all rows of a table being tracked.

E、 FLASHBACK drop requires undo to retrieve all versions of a row that existed between two points
In time.

F、 FLASHBACK version query requires undo to retrieve all versions of a row that existed between
Two points in time.

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多选题 6. Which two are prerequisites for performing Flashback Transaction?

A、Fast Recovery Area must be enabled for the database.

B、The EXECUTE privilege must be granted to a user on the DBMS_FLASHBACK package.

C、Undo retention guarantee must be configured for the database.

D、A supplemental log must be enabled for the primary key.

E、Row movement must be enabled.

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多选题 4. For which two requirements can you use the USER_TABLESPACE clause with the CREATE PLUGGABLE DATABASE command? (Choose two.)

A、 to specify a default tablespace in a PDB cloned from another PDB in the same CDB.

B、 to exclude all tablespaces except SYSTEM, SYSAUX, and TEMP when plugging in a PDB

C、 to include specific user tablespaces only when relocating a PDB

D、 to specify the list of user tablespaces to include when moving a non-CDB to a PDB

E、 to exclude a temp tablespace when plugging in a PDB

F、 to specify the list of tablespaces to include when creating a PDB from the CDB seed

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多选题 7.2、Which three statements are true about Flashback Data Archive?

A、To use Flashback Data Archive, users must have unlimited quota on the Flashback Data Archive
Tablespace.

B、To enable Flashback Data Archive for a table, it is mandatory to have a default Flashback Data
Archive for a database.

C、While enabling Flashback Data Archive for a table, if no name is provided for Flashback Data
Archive, it is enabled using the default Flashback Data Archive.

D、A table enabled for Flashback Data Archive cannot be dropped unless Flashback Data Archive is
Disabled or disassociated first.

E、Flashback Data Archive prevents flashback queries from getting a snapshot-too-old error.

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多选题 2. Choose three.
In which three situations can you use threshold server-generated alerts to help diagnose and fix
Problems?

A、when free space in a dictionary managed tablespace falls below a specified percentage

B、when free space in a locally managed tablespace falls below a specified percentage

C、when the total number of locked user account exceeds a specific value

D、when the number of logons per second exceeds a specific value

E、when a resumable statement is suspended

F、when the total number of logons exceeds a specific value

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多选题 3. While backing up to an SBT channel, you determine that the read phase of your compressed Recovery Manager (RMAN) incremental level 0 backup is a bottleneck.
FORCE LOGGING is enabled for the database.
Which two could improve read performance? (Choose two.)

A、 Increase the size of tape I/O buffers.

B、 Disable FORCE LOGGING for the database.

C、 Increase the size of the database buffer cache.

D、 Enable asynchronous disk I/O.

E、 Increase the level of RMAN multiplexing.

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