Basic Concept of Multilevel Database Security - Multilevel Security for Relational Databases - page 31

the departure relation is used to store the departure notice of each
employee when he leaves the site of the work, the timesheet relation
is used to store the timesheet of each employee every day, and the
annual rights relation is used to store the rights of each employee
every year.

2.5.2 Impact of Varying the Number of Tuples

This experiment was designed to determine if the cost of processing
varying numbers of tuples has an impact on the performance of
the multilevel database models. We chose this experiment because
the size of a database is, in part, based on the number of its tuples
(records), and the number of tuples processed during each transaction
could determine how long it takes to return a response to a user
(Figure 2.4).

2.5.3 Impact of Varying the Number of Attributes

This experiment was designed to determine if the cost of processing
varying numbers of attributes has an impact on the performance of
the multilevel database models (Figure 2.5).

8
7
6

5
4
3

2
1
0

0 500 1000

Number of Tuples

1500 2000

SeaView
MLR

Jajodia-Sandhu
Belief-Consistent

Smith-Winslett

Figure 2.4 The impact of varying the number of tuples on the performance of a multilevel
database.