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Generalization hierarchies and M-way associative entity types are specialized data model ing constructs A typical novice mistake is to use them inappropriately You should not use generalization hierarchies just because an entity can exist in multiple states For example, the requirement that a project task can be started, in process, or complete does not indicate the need for a generalization hierarchy If there is an established classification and specialized attributes and relationships for subtypes, a generalization hierarchy is an appropriate tool A n M-way associative entity type (an associative entity type representing an M-way re lationship) should be used w h e n the database is to record combinations o f three (or more) objects rather than just combinations o f two objects In most cases, only combinations o f two objects should be recorded For example, if a database needs to record the skills pro vided by an employee and the skills required by a project, binary relationships should be used If a database needs to record the skills provided by employees for specific projects, an M - w a y associative entity type is needed N o t e that the former situation with binary rela tionships is much more c o m m o n than the latter situation represented by an M-way associa tive entity type

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NetSonar (recently renamed CiscoSecure Scanner) is a vulnerability assessment tool that gathers detailed information about all devices on your network, including servers (HTTP, e-mail, FTP, and so on) and network devices (including routers and switches) Services and protocols running on these devices are checked to determine security vulnerabilities The data collected can be generated into reports and graphs for monitoring and improving network security and security policies

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When a transaction requests a lock on a data item in a particular mode, and no other transaction has a lock on the same data item in a con icting mode, the lock can be granted However, care must be taken to avoid the following scenario Suppose a transaction T2 has a shared-mode lock on a data item, and another transaction T1 requests an exclusive-mode lock on the data item Clearly, T1 has to wait for T2 to release the shared-mode lock Meanwhile, a transaction T3 may request a shared-mode lock on the same data item The lock request is compatible with the lock granted to T2 , so T3 may be granted the shared-mode lock At this point T2 may release the lock, but still T1 has to wait for T3 to nish But again, there may be a new transaction T4 that requests a shared-mode lock on the same data item, and is granted the lock before T3 releases it In fact, it is possible that there is a sequence of transactions that each requests a shared-mode lock on the data item, and each transaction releases the lock a short while after it is granted, but T1 never gets the exclusive-mode lock on the data item The transaction T1 may never make progress, and is said to be starved We can avoid starvation of transactions by granting locks in the following manner: When a transaction Ti requests a lock on a data item Q in a particular mode M , the concurrency-control manager grants the lock provided that 1 There is no other other transaction holding a lock on Q in a mode that con icts with M 2 There is no other transaction that is waiting for a lock on Q, and that made its lock request before Ti Thus, a lock request will never get blocked by a lock request that is made later.

One protocol that ensures serializability is the two-phase locking protocol This protocol requires that each transaction issue lock and unlock requests in two phases: 1 Growing phase A transaction may obtain locks, but may not release any lock 2 Shrinking phase A transaction may release locks, but may not obtain any new locks

C y c l e s in an E R D may indicate redundant relationships A cycle involves a collection o f re lationships arranged in a loop starting and ending with the same entity type For example in Figure 610, there is a cycle o f relationships connecting Customer, Meter Bill, Reading, and In a cycle, a relationship is redundant if it can be derived from other relationships and Includes In the opposite direction, the customer associated ReadBy, and Uses relationships Although a relationship can be derived, it is and

The McGraw Hill Companies, 2001

NetRanger (recently renamed CiscoSecure Intrusion Detection System) is an intrusion detection security system used to detect, report, and terminate unauthorized activity in your network The content of packets is analyzed to verify traffic authorization Traffic such as SATAN attacks and ping sweeps can be detected (assuming they are configured in the policy) in real time NetRanger Director management console will then remove the offender from the network

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