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Question ID 2518

Exhibit
 
Examine the following SQL statement:
 
Examine the exhibit to view the execution plan.
Which statement is true about the execution plan?

Option A

A. The EXPLAIN PLAN generates the execution plan and stores it in c$SQL_PLAN after
 
executing the query. Subsequent executions will use the same plan.
 

Option B

B.    The EXPLAIN PLAN generates the execution plan and stores it in PLAN_TABLE without executing the query. Subsequent executions will always use the same plan.
 

Option C

C.    The row with the ID 3 is the first step executed in the execution plan.
 

Option D

D.    The row with the ID 0 is the first step executed in the execution plan.

 

Option E

E.    The rows with the ID 3 and 4 are executed simultaneously.

Correct Answer E
Explanation


Question ID 2519

Which two types of SQL statements will benefit from dynamic sampling?
 

Option A

A.    SQL statements that are executed parallel
 

Option B

B.    SQL statement that use a complex predicate expression when extended statistics are not available.
 

Option C

C.    SQL statements that are resource-intensive and have the current statistics
 

Option D

D.    SQL statements with highly selective filters on column that has missing index statistics

 

Option E

E.    Short-running SQL statements

Correct Answer A,B
Explanation

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