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Dirty reads and nonrepeatable reads are prevented; phantom reads can occur Bean methods with this isolation level have the same restrictions as those in the Read Committed level and can execute only repeatable reads Serializable The transaction has exclusive read and update privileges; different transactions can neither read nor write to the same data Dirty reads, nonrepeatable reads, and phantom reads are prevented This isolation level is the most restrictive These isolation levels are the same as those defined for JDBC Specifically, they map to the static final variables in the javasqlConnection class The behavior modeled by the isolation levels in the connection class is the same as the behavior described here The exact behavior of these isolation levels depends largely on the locking mechanism used by the underlying database or resource How the isolation levels work depends in large part on how your database supports them.

much of the testing, it is more likely to have errors than using RSoP in planning mode. Such errors may be in upper-level GPOs that are not applied during testing, or in site GPOs not being tested, and so on.

Perform an inventory on the types of existing and proposed systems that might affect the design. Attaining knowledge that spans the entire organization is impor tant. Even if not all systems will affect the proposed design, knowledge of all sys tems allows you to ask the right questions. In addition, few organizations restrict digital communications to their employees only. Most have some digital interface with customers, vendors, and partners. Before starting a design, determine what types of systems exist. Here is a list of things to check or to check for:

18-13

Windows, Linux, Unix, other midrange systems, and IBM-style mainframes Existing network infrastructure, network devices, and appliances Various specialized network roles, such as databases, Web servers, and e-mail servers Specialized access scenarios, such as telecommuters, mobile personnel (such as sales staff), branch offices, foreign offices, and warehouses

In EJB, the deployer sets transaction isolation levels in a vendor-specific way if the container manages the transaction The EJB developer sets the transaction isolation level if the enterprise bean manages its own transactions Up to this point, we have discussed only container-managed transactions; we discuss bean-managed transactions later in this chapter..

any passerby. By using Group Policy Loopback processing mode, you can ensure that any user will receive only the policies that are supposed to be used on the kiosk, rather than the policy settings that might apply on a different networked computer.

B. Incorrect: Each computer will join the domain as a separate computer account. C. Correct: In placing all kiosk computer accounts within the same OU, they will

If the system will interface with customer or partner systems, understand the types of systems that customers and partners will have. The security design must include recommendations on how to securely interoperate with devices outside of your network. For each proposed design, evaluate computers, software, and network infrastruc ture that will need to interoperate with computers targeted for new software or processes by following these steps:

D. Incorrect: It may be impossible to do this based on your company s physical net-

Generally speaking, as the isolation levels become more restrictive, the performance of the system decreases because transactions are prevented from accessing the same data. If isolation levels are very restrictive in other words, if they are at the Serializable level then all transactions, even simple reads, must wait in line to execute. This can result in a system that is very slow. EJB systems that process a large number of concurrent transactions and need to be very fast will therefore avoid the Serializable isolation level where it is not necessary. Isolation levels, however, also enforce consistency of data. More restrictive isolation levels help to ensure that invalid data is not used for performing updates. The old adage, garbage in, garbage out, applies. The Serializable isolation level ensures that data is never accessed concurrently by transactions, thus ensuring that the data is always consistent. Choosing the correct isolation level requires some research about the database you are using and how it handles locking. You must also carefully analyze how each piece of data in your application is being used. For instance, most systems have some entities which will rarely, if ever, change. Even if these types of data do change, they would rarely affect the integrity of the system. Therefore, a low isolation level can be specified when a piece of business logic is viewing only this type of data. Other data, such as the current balance in an Account, on the other hand, can greatly affect the integrity of our BankEJB; this may require isolation to be more restrictive.