Oracle Oracle Database Application Development 1Z0-062 Questions & Answers

• Question 401:

  Which two statements are true about the logical storage structure of an Oracle database? (Choose two.)

  A. An extent contains data blocks that are always physically contiguous on disk.

  B. An extent can span multiple segments.

  C. Each data block always corresponds to one operating system block.

  D. It is possible to have tablespaces of different block sizes.

  E. A data block is the smallest unit of I/O in data files.

  Correct Answer: DE

• Question 402:

  Which two statements correctly describe the relationship between data files and logical database structures? (Choose two.)

  A. A segment cannot span data files.

  B. A data file can belong to only one tablespace.

  C. An extent cannot span data files.

  D. The size of an Oracle data block in a data file should be the same as the size of an OS block.

  Correct Answer: BC

  A single extent can never span data files. https://docs.oracle.com/database/121/CNCPT/logical.htm#CNCPT1095

• Question 403:

  Which statement is true about the Log Writer process?

  A. It writes when it receives a signal from the checkpoint process (CKPT).

  B. It writes concurrently to all members of multiplexed redo log groups.

  C. It writes after the Database Writer process writes dirty buffers to disk.

  D. It writes when a user commits a transaction.

  Correct Answer: D

  References:

  http://docs.oracle.com/cd/B19306_01/server.102/b14220/process.htm (see log writer process (LGWR))

• Question 404:

  The ORCL database is configured to support shared server mode. You want to ensure that a user connecting remotely to the database instance has a one-to-one ratio between client and server processes.

  Which connection method guarantees that this requirement is met?

  A. connecting by using an external naming method

  B. connecting by using the easy connect method

  C. creating a service in the database by using the dbms_service.create_service procedure and using this service for creating a local naming service

  D. connecting by using the local naming method with the server = dedicated parameter set in the tnsnames.ora file for the net service

  E. connecting by using a directory naming method

  Correct Answer: D

• Question 405:

  Which two tasks can be performed on an external table? (Choose two.)

  A. partitioning the table

  B. creating an invisible index

  C. updating the table by using an update statement

  D. creating a public synonym

  E. creating a view

  Correct Answer: DE

  You can, for example select, join, or sort external table data. You can also create views and synonyms for external tables. However, no DML operations (UPDATE, INSERT, or DELETE) are possible, and no indexes can be created, on external tables.

  http://docs.oracle.com/cd/B28359_01/server.111/b28310/tables013.htm#ADMIN01507

• Question 406:

  Which three statements are true about a job chain? (Choose three.)

  A. It can contain a nested chain of jobs.

  B. It can be used to implement dependency-based scheduling.

  C. It cannot invoke the same program or nested chain in multiple steps in the chain.

  D. It cannot have more than one dependency.

  E. It can be executed using event-based or time-based schedules.

  Correct Answer: ABE

• Question 407:

  The HR user receives the following error while inserting data into the sales table:

  

  On investigation, you find that the users tablespace uses Automatic Segment Space Management (ASSM). It is the default tablespace for the HR user with an unlimited quota on it.

  Which two methods would you use to resolve this error? (Choose two.)

  A. Altering the data file associated with the USERS tablespace to extend automatically

  B. Adding a data file to the USERS tablespace

  C. Changing segment space management for the USERS tablespace to manual

  D. Creating a new tablespace with autoextend enabled and changing the default tablespace of the HR user to the new tablespace

  E. Enabling resumable space allocation by setting the RESUMABLE_TIMEOUT parameter to a nonzero value

  Correct Answer: AB

• Question 408:

  Which three factors influence the optimizer's choice of an execution plan? (Choose three.)

  A. the optimizer_mode initialization parameter

  B. operating system (OS) statistics

  C. cardinality estimates

  D. object statistics in the data dictionary

  E. fixed baselines

  Correct Answer: ACD

• Question 409:

  Examine the resources consumed by a database instance whose current Resource Manager plan is displayed.

  

  Which two statements are true? (Choose two.)

  A. An attempt to start a new session by a user belonging to DSS_QUERIES fails with an error.

  B. An attempt to start a new session by a user belonging to OTHER_GROUPS fails with an error.

  C. The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited for the CPU due to resource management.

  D. The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited for the CPU due to I/O waits and latch or enqueue contention.

  E. A user belonging to the DSS__QUERIES resource consumer group can create a new session but the session will be queued.

  Correct Answer: CE

• Question 410:

  Examine the parameters for your database instance:

  

  You execute the following command:

  SQL> ALTER TABLESPACE undotbs1 RETENTION NOGUARANTEE;

  Which statement is true in this scenario?

  A. Undo data is written to flashback logs after 1200 seconds.

  B. Inactive undo data is retained for 1200 seconds even if subsequent transactions fail due to lack of space in the undo tablespace.

  C. You can perform a Flashback Database operation only within the duration of 1200 seconds.

  D. An attempt is made to keep inactive undo for 1200 seconds but transactions may overwrite the undo before that time has elapsed.

  Correct Answer: D