On a use-case diagram, an extends relationship extends a use case ...

[cdr_15]

On a use-case diagram, an extends relationship extends a use case by capturing additional actions or behaviors that need to be performed.
 
  Indicate whether the statement is true or false

Question 2

Sequential retrieval on the primary key is impractical with the hashed file organization.
 
  Indicate whether the statement is true or false

[mmj22343]

Answer to Question 1

TRUE
Explanation: Microsoft Visio shows this as a line with a hollow triangle pointing toward the extended use case and labeled with the <> symbol, extends a use case by adding new behaviors or actions.
CL

Answer to Question 2

TRUE
Explanation: Although there are several variations of hashed files, in most cases the rows are located nonsequentially as dictated by the hashing algorithm. This makes sequential retrieval impractical.
CL

[cdr_15]

TYSM

[daiying98]

Excellent