OCP-083_在线真题试卷与模拟练习_OCP-083_考试宝

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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 ALTER TABLE 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?

You notice that the performance of your production 24x7 Oracle 12c database has
Significantly degraded. Sometimes, you are not able to connect to the database instance because
It hangs.How can you detect the cause of the degraded performance?

You must transport the UNIVERSITY tablespace from one database to another. The
UNIVERSITY tablespace is currently open read/write.
The source and destination platforms have different endian formats.
Examine this list of actions:
1 Make the UNIVERSITY tablespace read-only on the source system.
2 Export the UNIVERSITY tablespace metadata using EXPDP.
3 Convert the UNIVERSITY tablespace data fies to the destination platform format using RMAN on the source system.
4 Copy the UNIVERSITY tablespace data files to the destination system.
5 Copy the Data Pump dump set to the destination system.
6 Convert the UNIVERSITY tablespace data files to the destination platform format using RMAN on the destination system.
7 Import the UNIVERSITY tablespace metadata using IMPDP.
8 Make the UNIVERSITY tablespace read/write on the destination system.
Which is the minimum number of actions required, in the correct order, to transport the UNIVERSITY tablespace?

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 users 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:
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:
While CDB1 is open, ‘/u02/app/oracle/fast_recover_area/cdb1/CDB1/controlfile02.ctl’is
Accidentally deleted.
To recover from this critical failure, you execute these commands:
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 t he
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 t he execution of complex BI 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:
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?