Examine the following ALTER command:
SQL> ALTER DISKGROUP dgroup1 UNDROP DISKS;
What is the purpose of the command?
Correct Answer:A
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 BI queries scheduled at night. Which DBCA option must you choose to create the database?
Correct Answer:C
References:
http://www.oracledistilled.com/oracle-database/administration/creating-a-database-using-database-configuration
The HR user executes the following query on the EMPLOYEES table but does not issue COMMIT, ROLLBACK, or any data definition language (DDL) command after that:
HR then opens a second session.
Which two operations wait when executed in HR’s second session? (Choose two.)
Correct Answer:AC
When does a database checkpoint occur?
Correct Answer:A
You upgraded from a previous Oracle database version to Oracle Database version to Oracle Database 12c. Your database supports a mixed workload. During the day, lots of insert, update, and delete operations are performed. At night, Extract, Transform, Load (ETL) and batch reporting jobs are run. The ETL jobs perform certain database operations using two or more concurrent sessions.
After the upgrade, you notice that the performance of ETL jobs has degraded. To ascertain the cause of performance
degradation, you want to collect basic statistics such as the level of parallelism, total database time, and the number of I/O requests for the ETL jobs.
How do you accomplish this?
Correct Answer:D
* Monitoring database operations
Real-Time Database Operations Monitoring enables you to monitor long running database tasks such as batch jobs, scheduler jobs, and Extraction, Transformation, and Loading (ETL) jobs as a composite business operation. This feature tracks the progress of SQL and PL/SQL queries associated with the business operation being monitored. As a DBA or developer, you can define business operations for monitoring by explicitly specifying the start and end of the operation or implicitly with tags that identify the operation.
You ran this command on a source database:
$> expdp hr/hr DIRECTORY=dumpdir DUMPFILE=emp1.dmp VIEWS_AS_TABLES=emp_dept On the target database, you run this command:
$> impdp hr/hr DIRECTORY=dumpdir DUMPFILE=emp1.dmp VIEWS_AS_TABLES=emp_dept Which two statements are true? (Choose two.)
Correct Answer:DE