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Examine the kinds of applications you are running and the resources these appli cations require. Are the resources adequate Consider network or disk utilization or other activities occurring at the times that you see increasing resource utilization. Try to understand the usage patterns. Are they associated with specific protocols or computers Consider variables in your workload, such as processing different jobs at different times. What work is being done by the system Approach bottleneck correction in an organized manner. Never make more than one change at a time, always repeat monitoring after a change to validate the results, eliminate results that are suspect, and keep good records of what you have done and what you have learned.

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The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson and then try the question again. Answers to the questions can be found in the Questions and Answers section at the end of this chapter. 1. What action should you take to troubleshoot problems indicated by error and warning messages in the directory service log

<entity-mappings> <entity-listeners> <entity-listener class="org.package.Auditor"> <post-persist name="postInsert"/> <post-load name="postLoad"/> </entity-listener> </entity-listeners> </entity-mappings

2. What registry subkey contains the entries for which you can increase the logging level to retrieve more detailed information in the directory service log

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4. What are the four steps in the process of analyzing and interpreting performancemonitoring results

Many IIS-specific features can be used by themselves, and many interoperate with operating system permissions to provide additional security for Web sites. Follow the guidelines in the following sections to control access to Web servers, Web sites, appli cations, and server resources.

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If you want to turn off default entity listeners to a particular entity class, you can use the @javax.persistence.ExcludeDefaultListeners annotation:

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You can restrict access to the Web site or application by blocking specific domain names and IP addresses, or by allowing only specific domains and IP addresses. You can, for example, restrict access to intranet sites to computers on your internal network or some portion of your internal network. You can block specific IP addresses from which attacks are occurring. Access cannot be blocked by a portion of a Web site or an application.

5. In the process of analyzing and interpreting performance-monitoring results, what is a baseline

@Entity @ExcludeDefaultListeners public class NoEntityListenersEmployee { ... }

Use address ranges instead of domain names where possible. If domain names are used, a reverse lookup must be done each time a request for access is received, and this will reduce performance.

To troubleshoot problems indicated by error and warning messages in the direc tory service log, examine details about the message by double-clicking the error or warning message. You can retrieve more detailed information about directory service process ing by increasing the logging level for the appropriate registry entry in the HKEY_LOCAL_MACHINE SYSTEM\CurrentControlSet\Services\NTDS\Diagnostics subkey in the Registry. All of the entries in the Diagnostics subkey have the REG_DWORD data type and a default value of 0. Leave logging levels set to 0 unless you are investigating a problem. Increasing the logging level increases the detail of the messages and the number of messages emitted and can degrade server performance. To troubleshoot problems indicated by System Monitor, you must be able to ana lyze and interpret the results of each counter you have selected for monitoring. There are four steps in the process of analyzing and interpreting performancemonitoring results: (1) establish a baseline, (2) analyze performance-monitoring results, (3) plan and implement changes to meet the baseline, and (4) repeat steps 2 and 3 until performance is optimized.

To block access, leave the default setting (in which all users are allowed to access the site) and then specify the domain or IP address range to be blocked. To restrict access to specific domains or address ranges, disable default access (in which no users are allowed to access the site) and then add the domain names and IP address ranges of the exceptions that you want to make (as shown in Figure 13-3). Restricting access to intranet Web sites to specific internal subnets not only makes good security sense, but it meets the business needs of restricting certain types of data to specific employees and preventing access by outsiders who penetrate the internal network. Wireless users, for example, can be given IP addresses from a range that is blocked from accessing certain internal Web sites. Visitors and intruders might gain access to the network, but access to the internal Web site is prevented.