Author Question: On a use-case diagram, an extends relationship extends a use case by capturing additional actions or ... (Read 32 times)

cdr_15 · **on:** Jul 7, 2018

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 · **Reply #1 on:** Jul 7, 2018

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