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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?

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

You notice performance degradation in your production Oracle 12c database. You want to know what caused this performance difference. Which method or feature should you use?

You notice that the performance of your production 24/7 Oracle 12c database has significantly degraded. Sometimes you are not able to connect to the instance because it hangs. You do not want to restart the database instance. How can you detect the cause of the degraded performance?

How can you detect the cause of the degraded performance?

RMAN is connected to a target database instance and an auxilary instance.
You execute the command:
RMAN> DUPLICATE TARGET DATABASE
TO dupdb
FROM ACTIVE DATABASE
SECTION SIZE 1G;
What is the outcome?

Choose the best answer
You want to create a duplicate database DUP_DB from your production database PROD on the same host. The PROD database uses Automatic Storage Management （ASM） for storage. Regular backups are taken using RMAN connected to a recovery catalog. You create an auxiliary instance and want to execute the command:
RMAN> DUPLICATE TARGET DATABASE TO dup_db
FROM ACTIVE DATABASE;
What is a prerequisite for the successful execution of this command

A user complains about poor database performance.
You want to verify if the user's session has waited for certain types of I/O activity.
Which view displays all waits waited on by a session at least once?

Automatic Shared Memory Management is disabled for one of your database instances. Some SQL statements perform poorly due to excessive hard parse activity, thereby degrading performance.
What would be your next step?

choose one
You take regular backups of one of your production databases by using RMAN with a recovery catalog. You have added two new tablespaces to this database which must be included in future backups.
Which process occurs which allows the new backups to contain the new datafiles?

Examine this configuration:

1）CDB1 is an Oracle Database 12c Release 2 database containing pluggable databases PDB$$SEED, PDB1, and PDB2.

2）PDB$$SEED is open READ ONLY

3）PDB1 is open READ WRITE

4）PDB2 is MOUNTED.

5）ORACLE_HOME is /u01/app/oracle/product/18.1.0/dbhome_1.

You execute these commands before upgrading the database to the current release:

$$ ・ oraenv

ORACLE_SID = [cdbl] ? cdbl

The Oracle base remains unchanged with value /uOl/app/oracle

$$$ORACLE_HOME/jdk/bin/java -jar preupgrade.jar TERMINAL TEXT

For which databases will fixup scripts be created?

Your production database is running in archivelog mode. You use RMAN with a recovery catalog to back up your database to media and the database is uniquely identified in the recovery catalog. You want to create a test database from the production database and allow the production database to remain open during the duplicate process. You restore the database backups to a new host with the same directory structure as the production database and want to use the recovery catalog for future backups after the database is successfully restored to the new host. How would you achieve this?

Examine this configuration:

1）CDB1 is a container database running in ARCHIVELOG mode

2）Controlfiles of CDB1 are multiplexed in

'/uOl/app/oracle/oradata/CDBl/controlfile/controlfileOl.ctlr and '/u02/app/oracle/fast_recover_area/cdbl/CDBl/controlfile02.ctl*

3）The only backup ofCDBl was taken when CONTROLFILE AUTOBACK was OFF

4）SNAPSHOT CONTROLFILE NAME is

'/uOl/app/oracle/product/12.2.0. l/db_l/dbs/snapcf_cdbl. f * .

While CDB1 is open, ‘/u02/app/oracle/fast_recover_area/cdbl/CDBl/controlfile02.ctl' is accidentally deleted.

To recover from this critical failure, you execute these commands:

$ rman target sys/oracle_4U@localhost:1521/cdbl

RMAN> SHUTDOWN ABORT

Oracle instance shut down

RMAN> STARTUP NOMOUNT

RMAN RESTORE CONTROLFILE FROM

'/uOl/app/oracle/oradata/CDBl/controlfile/controlfileOl.ctlr;

What will be the outcome?

Examine these actions:
1）Create a new database for a recovery catalog.
2）Create a tablespace with sufficient space in the catalog database for the recovery catalog.
3）Configure ARCHIVE LOG mode for the catalog database.
4）Create a user to own the recovery catalog schema with quota on the tablespace that will contain the catalog.
5）Grant the RECOVERY_CATALOG_OWNER role to the recovery catalog schema owner.
6）Grant the SYSBACKUP privilege to the recovery catalog schema owner.
Which are the minimum actions that must be performed before executing the CREATE CATALOG command?

Choose one
You want to create a test database as a replica of your production database with minimum intervention from a DBA.
Which method would you use?

You plan to create a database by using the Database Configuration Assistant (DBCA), with the following specifications:
Applications will connect to the database via a middle tier.
The number of concurrent user connections will be high.
The database will have mixed workload, with the execution of complex Bl queries scheduled at night.
Which DBCA option must you choose to create the database?

Examine this configuration:
1）The ORCL database data files are in Automatic Storage Management (Oracle ASM) disk group +DATA.
2）ORCL uses disk group +FRA for the Fast Recovery Area.
3）LISTENER is the listener for ORCL.
4）The database, listener, ASM instance, and ASM disk groups are managed by Oracle Restart.
5）All components are currently shut down.
You execute this command:
$ srvctl start database -d ORCL
What is the outcome?

You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?

In a recent Automatic Workload Repository (AWR) report for your database, you notice a high number of buffer busy waits. The database consists of locally managed tablespaces with free list managed segments.
On further investigation, you f ind that buffer busy waits is caused by contention on data blocks.
Which option would you consider first to decrease the wait event immediately?

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