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Upgrade to Oracle Database 12c Questions and Answers

Question 1

Examine the details of the Top 5 Timed Events in the following Automatic Workloads Repository (AWR) report:

What are three possible causes for the latch-related wait events? (Choose three.)

Options:

A.

The size of the shared pool is too small.

B.

Cursors are not being shared.

C.

A large number COMMITS are being performed.

D.

There are frequent logons and logoffs.

E.

The buffers are being read into the buffer cache, but some other session is changing the buffers.

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Question 2

The current system change number (SCN) for a live database is 663571.

You decide to use the flashback table statement to flash back the customers table to SCN 662116.

After flashing back the customers table, you query It and decide to undo the effects of the flashback table command.

Which is the fastest way to do this?

Options:

A.

Execute another flashback table statement to restore the customers table to SCN 663571.

B.

Perform tablespace point-in-time recovery because flashback table cannot be performed on a table that has already been flashed back.

C.

Execute the RMAN recover block command by specifying the table name and SCN 663571 because fiashback table cannot be performed on a table that has already been flashed back.

D.

Perform table polnt-in-time recovery because flashback table cannot be performed on a table that has already been flashed back.

Question 3

You plan to drop the column of a table that has Flashback Archiving enabled.

You want to ensure minimal service disruption.

How would you do this in your Oracle 12c Database?

Options:

A.

Disable Flashback Archiving, set the column unused, and re-enable Flashback Archiving.

B.

Disable Flashback Archiving, drop the column unused, and re-enable Flashback Archiving.

C.

Disassociate the Flashback Archive using the DBMS_FLASHBACK_ARCHIVE.DISASSOCIATE_FBA procedure, drop the column, and re-associate the Flashback Archive using the DBMS_FLASHBACK_ARCHIVE.RESASSOCIATE_FBA procedure.

D.

Drop the column using the ALTER TABLE statement.

E.

Disassociate the Flashback Archive using the DBMS_FLASHBACK_ARCHIVE.DISASSOCIATE_FBA procedure, set the column unused, and re-associate the Flashback Archive using the DBMS_FLASHBACK_ARCHIVE.RESASSOCIATE_FBA procedure.