zxing barcode generator example c# Part 8: System Maintenance and Recovery in Visual C#

Create Quick Response Code in Visual C# Part 8: System Maintenance and Recovery

Part 8: System Maintenance and Recovery
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Displays previous event Displays next event Copies current event to Clipboard
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Figure 31-2. The properties dialog box for an event provides a textual description and binary data that are not shown in the main Event Viewer window.
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Directly below the Next Event button, near the upper right corner of the window, is a handy Copy button, as shown in Figure 31-2. Clicking here sends the entire contents of the Event Properties dialog box to the Clipboard, allowing you, for example, to paste the information into an e-mail message and send it to a support technician. (You can also copy some or all of the text in the dialog box by selecting it and pressing Ctrl+C. Use this technique to selectively copy field data from the top of the dialog box as well as information in the Description and Data boxes.)
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Monitoring System Activities with Event Viewer Tip Find better descriptions on the Web The Description field in some events is a model of clarity and completeness. Others, however, leave much to be desired. You can usually find more information on the Web by searching for event id followed by the Event ID number. One particular site deserves mention: EventID.Net (http://eventid.net). Here you can search for information by event ID and source; results typically include a clear description, links to relevant knowledge base articles, and comments and suggestions from knowledgeable users.
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Searching for an Event
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The Find command on Event Viewer s View menu allows you to locate particular items in the current log. The Find dialog box, shown in Figure 31-3, includes a Description box in which you can specify all or a portion of an event s descriptive text. To locate the most recent event that involved any kind of failure, for example, you would select the first event in the log (assuming you ve kept the default chronological sort order), choose Find, type fail in the Description field, and click Find Next.
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Figure 31-3.
You can use this dialog box to find a particular event.
Part 8: System Maintenance and Recovery
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Microsoft Windows XP Inside Out, Second Edition
Filtering the Log Display
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As you can see from a cursory look at your System log, events can pile up quickly, obscuring those of a particular type (such as print jobs) or those that occurred at a particular date and time. To filter a log so that Event Viewer displays only the items you currently care about, right-click the log s name in the console tree and choose Properties. Then fill out the Filter tab of the log s properties dialog box (it looks much like the Find dialog box shown in Figure 31-3), and click OK. To restore the unfiltered list, return to this dialog box and click Restore Defaults. With the help of the New Log View command on the Action menu, you can quickly switch between filtered and unfiltered views of a log or between one filtered view and a different filtered view. Simply select the log in which you re interested, right-click, and then choose New Log View. Event Viewer adds the new view to the console tree. Select the new view and filter to taste. Now you can move between views by navigating the console tree.
Working with Log Files
In general, you don t need to do anything with the log (.evt) files. But you might want to limit their size, archive their content, or clear them tasks that are explained in the following sections.
Setting Log File Size and Longevity
Log files don t continue to pile up new events forever. If they did, they would eventually consume an unmanageable amount of disk space. By default, each log file has a maximum size of 512 KB. You can adjust that downward or upward in 64-KB increments. Caution
Although Event Viewer lets you specify a size for each log as large as 4 GB, don t attempt it. The total combined size of the three event logs should not exceed 300 MB. (Fortunately, there s seldom a reason to make them anywhere near that big.) That s because Event Viewer uses memory-mapped files, which means that all three log files are loaded into system memory. Other services also vie for the same pool of system memory, and are constrained by a 1-GB limit on the amount of this type of memory used by any one process. If the system is unable to allocate memory for system-mapped files, you ll undoubtedly experience significant performance degradation and encounter errors such as lost events.
Also by default, events in each log file have a minimum longevity of seven days. That means that if a file reaches its maximum size, new events overwrite the oldest ones but only if the oldest ones are at least seven days old. That too is an adjustable parameter. To change either a log file s maximum size or its events minimum longevity, select the log in question in the console tree. Then choose Properties from the Action menu. Figure 31-4
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