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There is redundant information in the resultant gure, however, since every employee, branch, job combination in manages is also in works-on If the manager were a value rather than an manager entity, we could instead make manager a multivalued attribute of the relationship works-on But doing so makes it more dif cult (logically as well as in execution cost) to nd, for example, employee-branch-job triples for which a manager is responsible Since the manager is a manager entity, this alternative is ruled out in any case The best way to model a situation such as the one just described is to use aggregation Aggregation is an abstraction through which relationships are treated as higherlevel entities Thus, for our example, we regard the relationship set works-on (relating the entity sets employee, branch, and job) as a higher-level entity set called works-on Such an entity set is treated in the same manner as is any other entity set We can then create a binary relationship manages between works-on and manager to represent who manages what tasks Figure 219 shows a notation for aggregation commonly used to represent the above situation

With more and more users on the Internet, and growing instances of security breaches, companies are concerned more than ever about the safety of data Many companies are considering or have installed a firewall to protect internal networks A firewall can be a dedicated hardware box or a software application running on a PC or server It is used to separate two networks or subnets by deploying security policies that decide which traffic to permit and which to deny Typically, a firewall is developed around the support of authentication and authorization, data confidentiality, data audits, and policy management and control A Cisco router can act as a firewall by enabling access lists on its interface(s) The security

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A s indicated in 5, y o u should u s e the diagram rules to ensure that there are n o obvious errors in your ERD You also should u s e the guidelines in this section to check for design errors D e s i g n errors are more difficult to detect and resolve than diagram errors because design errors involve the meaning o f elements on a diagram, not just a diagram's structure The following subsections explain c o m m o n design problems, while Table 64 summarizes them

Figure 220 summarizes the set of symbols we have used in E-R diagrams There is no universal standard for E-R diagram notation, and different books and E-R diagram software use different notations; Figure 221 indicates some of the alternative notations that are widely used An entity set may be represented as a box with the name outside, and the attributes listed one below the other within the box The primary key attributes are indicated by listing them at the top, with a line separating them from the other attributes

The McGraw Hill Companies, 2001

provided by access lists is limited, but installing Cisco's Firewall IOS software on a router will increase the security and security-related configuration options Offering even better security than the Cisco Firewall IOS is the Cisco PIX Firewall In addition to the Firewall IOS and the PIX Firewall, Cisco offers NetSonar for assessment of network device security, and NetRanger for security intrusion detection These utilities will be covered in more detail in 14

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In a large ERD, it is easy to connect the wrong entity types or omit a necessary relationship You can connect the wrong entity types if y o u do not consider all o f the queries that a data base should support For example in Figure 6 1 2 , i f Customer is connected directly to Reading instead o f being connected to Meter, the control o f a meter cannot be established unless the meter has b e e n read for the customer Queries that involve meter control cannot be answered except through consideration o f meter readings If the requirements do not directly indicate a relationship, y o u should consider indirect implications to detect whether a relationship is required For example, the requirements for the water utility database do not directly indicate the n e e d for a relationship from Bill to Reading However, careful consideration o f the consumption calculation reveals the need for a relationship The Includes relationship connects a bill to its most recent meter read ings, thus supporting the consumption calculation

Cardinality constraints can be indicated in several different ways, as Figure 221 shows The labels and 1 on the edges out of the relationship are sometimes used for depicting many-to-many, one-to-one, and many-to-one relationships, as the gure shows The case of one-to-many is symmetric to many-to-one, and is not shown In another alternative notation in the gure, relationship sets are represented by lines between entity sets, without diamonds; only binary relationships can be modeled thus Cardinality constraints in such a notation are shown by crow s foot notation, as in the gure

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