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Question ID 2500

Which three statements are true about histograms?
 

Option A

A.    They capture the distribution of different values in an index for better selectivity estimates.
 

Option B

B.    They can be used only with indexed columns.
 
 

Option C

C.    They provide metadata about distribution of and occurrences of values in a table column.
 

Option D

D.    They provide improved selectivity estimates in the presence of data skew, resulting in execution plans with uniform distribution.
 

Option E

E.    They help the optimizer in deciding whether to use an index or a full table scan.

 

Option F

F.    They help the optimizer to determine the fastest table join order.

Correct Answer C,E,F
Explanation


Question ID 2501

View the exhibit and examine the query and its execution plan from the PLAN_TABLE. Which statement is true about the execution?

Option A

A.    The row with the ID column having the value 0 is the first step execution plan.
 

Option B

B.    Rows are fetched from the indexes on the PRODUCTS table and from the SALES table using full table scan simultaneously, and then hashed into memory.
 

Option C

C.    Rows are fetched from the SALES table, and then a hash join operator joins with rows fetched from indexes on the PRODUCTS table.

 

Option D

D.    All the partitions of the SALES table are read in parallel.

Correct Answer C
Explanation


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