Oracle 1z0-052 Exam Questions

Question 6 of 284

You have recently collected statistics on certain objects of a schema in your database. But you observe suboptimal execution plans for the queries on these objects after two days of statistics collection. The optimizer statistics retention period is set to its default value.
Which action would help to use the previous set of statistics on the objects?

Restore statistics from statistics history.

Reduce the optimizer statistics retention period by 2 days.

Set the OPTIMIZER_PENDING_STATISTICS parameter to TRUE.

Reduce the Automatic Workload Repository (AWR) retention period by 2 days.

Correct Answer: A

Question 7 of 284

Which three statements regarding the server parameter file (SPFILE) are true? (Choose three.)

An SPFILE is a binary file.

An SPFILE cannot reside on a client.

An SPFILE cannot contain static parameters.

An SPFILE can store changes persistently across instance restarts.

An SPFILE can be read by the database server, but it is not written to by the server.

An SPFILE must be created manually, before creating a database, even if you use the Database Configuration Assistant (DBCA) to create the database.

Correct Answer: A, B, D

Question 8 of 284

Your test database is configured to run in NOARCHIVELOG mode. One of the data files in the USERS tablespace is lost due to a media failure. You notice that all the online redo logs have been overwritten since the last backup.
What would you do to recover the data file?

Take the USERS tablespace offline and re-create the lost data file.

Shut down the instance, restore the data file from the last consistent backup and restart the database instance.

Shut down the instance, restores all the database files from the last consistent backup and restart the database instance.

Take the USERS tablespace offline, restore all the data files of the USERS tablespace from the last consistent backup and make the tablespace online.

Correct Answer: C

Question 9 of 284

Examine the command:
SQL>DBMS_STATS.SET_TABLE_PREFS('SH','CUSTOMERS','PUBLISH','false');
Which statement describes the effect of the above command?

Automatic statistics collection is stopped for the CUSTOMERS table

Statistics for the CUSTOMERS table are locked and cannot be overwritten

Existing statistics for the CUSTOMERS table become unusable for the query optimizer

Subsequently, statistics gathered on the CUSTOMERS table are stored as pending statistics

Correct Answer: D

Question 10 of 284

The instance abnormally terminates because of a power outage.
Which statement is true about redo log files during instance recovery?

Inactive and current redo log files are required to accomplish recovery.

Online and archived redo files are required to accomplish instance recovery.

All redo log entries after the last checkpoint are applied from redo log files to data files.

All redo log entries recorded in the current log file until the checkpoint position are applied to data files.

Correct Answer: C