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Question ID 2234

Which three statements are true about SQL plan directives?

Option A

A.    They are tied to a specific statement or SQL ID.
 

Option B

B.    They instruct the maintenance job to collect missing statistics or perform dynamic sampling to generate a more optimal plan.
 

Option C

C.    They are used to gather only missing statistics.
 

Option D

D.    They are created for a query expression where statistics are missing or the cardinality estimates by the optimizer are incorrect.
 

Option E

E.    They instruct the optimizer to create only column group statistics.

 

Option F

F.    Improve plan accuracy by persisting both compilation and execution statistics in the SYSAUX tablespace.

Correct Answer B,D,F
Explanation


Question ID 2235

You want to flash back a test database by five hours.
You issue this command:
 
SQL > FLASHBACK DATABASE TO TIMESTAMP (SYSDATE - 5/24); Which two statements are true about this flashback scenario?
 

Option A

A.    The database must have multiplexed redo logs for the flashback to succeed.

 

Option B

B.    The database must be MOUNTED for the flashback to succeed.
 

Option C

C.    The database must use block change tracking for the flashback to succeed.
 

Option D

D.    The database must be opened in restricted mode for the flashback to succeed.
 

Option E

E.    The database must be opened with the RESETLOGS option after the flashback is complete.
 

Option F

F.    The database must be opened in read-only mode to check if the database has been flashed back to the correct SCN.

Correct Answer B,E
Explanation

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