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Apache keeps extensive log files in /var/log/httpd/. With a default install, three logs are kept. The first is the access_log. This contains detailed information (such as remote IP address, the time and date of the request, and what was requested) of all requests received by Apache. error_log contains similar information but records error messages instead. For example, if a file does not exist or Apache receives an invalid request (such as those caused by attack scripts), the information will end up in here. It s the first place to look if you suspect something is amiss or you just want to make sure that everything is running smoothly. Apache separates the SSL side of things from the standard logs. Both ssl_access_log and ssl_error_log contain the same sorts of information; they re just separated out to make them easier to work with.

use EXECUTE AS in a stand-alone fashion, using it to switch the security context of the current database session. You can then switch back to your original security context by issuing the REVERT command. The abridged syntax for EXECUTE AS is as follows (the advanced cookie and CALLER options of this command are not discussed here but can be referenced in SQL Server 2005 Books Online under the EXECUTE AS topic): EXECUTE AS { LOGIN | USER } = 'name' [ WITH { NO REVERT } ] The arguments of this command are described in Table 18-18. Table 18-18. EXECUTE AS Abridged Syntax Arguments

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This application s GUI consists of a labeled text field and a button. The text field contains some text with accented letters. (Rindfleischetikettierungs berwachungsaufgaben bertragungsgesetz, which literally translates to cattle marking and beef labeling supervision duties delegation law, is the longest verified German word.) When you click this button, normalize() is invoked to perform canonical decomposition on the text s precomposed characters ( , , and ). Because the normalized result contains base letters followed by the diacritical marks for these characters, a regular expression is used to throw away these marks.

{ LOGIN | USER } = 'name'

The ability to create virtual hosts is probably one of the most powerful features that Apache offers. It is also no doubt one of the most widely used, and for good reason; it lets you run multiple web sites from a single web server. There are effectively two types of virtual host. You can create name-based virtual hosts or IP-based virtual hosts. Name-based virtual hosts are by far the most common and most useful because they allow you to have an almost unlimited number of web sites on one IP address. If you are hosting on an ADSL line or similar, chances are that you have only one IP address anyway. Although most hosting providers can supply you with more IP addresses, they often come at a hefty premium.

Select LOGIN to impersonate a SQL or Windows login or USER to impersonate a database user. The name value is the actual login or user name. If NO REVERT is designated, you cannot use the REVERT command to switch back to your original security context.

Groznyh s Text Normalization and Monitoring Image I/O Events Tech Tip (http://java.sun.com/ mailers/techtips/corejava/2007/tt0207.html#1). You should also check out the internationalization section of John O Conner s blog (http://www.joconner.com/category/internationalization/) for entries like Normalization: Canonical Decomposition. Sergey is a Swing Text developer at Sun. John has spent many years developing the i18n features at Sun.

So, why use IP-based virtual hosts Well, they do have one very important and critical role. You may remember from the beginning of the chapter when you looked at SSL certificates very briefly that because a secure session is established between the web browser and the web server before the web browser sends its request, Apache has no way to know which SSL certificate it should serve. In effect, it can serve only one SSL certificate on an IP address. Using multiple IP addresses is the only way for the server to hand out separate SSL certificates. Other than that, IP-based virtual hosts aren t really used that much. Apache already comes with the settings needed to create a default SSL virtual host. You saw this when you accessed the server using HTTPS when you first set up Apache. Although you saw the same page on both the secure and insecure versions, this is because by default Apache looks in the same location for both.

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