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The Trace Styles pane displays an element s styles based on order and precedence of application. Since an element can inherit styles from its ancestors, multiple (and sometimes conflicting) properties may be applied to an element. Unfortunately, developers cannot easily determine which styles were applied to an element without more information from the browser. Figure 5 15 shows the traced styles of an example element. Each applied style is shown here, and those styles that have been overridden during the cascade are struck through. The source of each CSS

MySQL is the most common database used with Drupal. MySQL has the ability to cache frequent queries in RAM so that the next time a given query is issued, MySQL will return it instantly from the cache. However, in most MySQL installations, this feature is disabled by default. To enable it, add the following lines to your MySQL option file; the file is named my.cnf and specifies the variables and behavior for your MySQL server (see http://dev. mysql.com/doc/refman/5.1/en/option-files.html). In this case, we re setting the query cache to 64MB: # The MySQL server [mysqld] query_cache_size=64M The current query cache size can be viewed as output of MySQL s SHOW VARIABLES command: mysql>SHOW VARIABLES LIKE 'query_cache%';

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JavaServer Pages Overview 198 JSP Standard Tag Library Overview 200 Struts Overview 201 Configuring Web Applications 202 Web Application Deployment Descriptor 202 Struts 203 Tag Libraries 205 Writing a Struts Action 206 Create Action Class 207 Mapping Action Class 210 Writing JavaServer Pages 211 JSP Wizard 211 Summary 215.

Experimenting with the size of the query cache is usually necessary. Too small a cache means cached queries will be invalidated too often. Too large a cache means a cache search may take a relatively long time; also, the RAM used for the cache may be better used for other things, like more web server processes, memcache, or the operating system s file cache.

property is shown next to it, and clicking it will navigate to its definition in the Source pane of the CSS tab (described later in this chapter).

sTip In Drupal, visit Administer Reports Status report, and click the MySQL version number to

CHAPTER 13 Servlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

get a quick overview of the values of some of the more important MySQL variables. You can also check if the query cache is enabled from that page.

The Layout pane (Figure 5 16) displays layout information of elements that occupy space on a page. The offset, margin, border, padding, size, position, and z-index properties are available here.

If you need to get a sense of what is happening when a given page is generated, devel.module is invaluable. It has an option to display all the queries that are required to generate the page along with the execution time of each query. See 21 for details on how to use devel. module to identify and optimize database queries using the EXPLAIN syntax. Another way to find out which queries are taking too long is to enable slow query logging in MySQL. This is done in the MySQL option file (my.cnf) as follows: # The MySQL server [mysqld] log-slow-queries

Figure 5 16. The Layout pane Developers can edit the layout values displayed in this view by clicking a value and making changes in the edit box that appears. Inline elements (such as <span>) that do not use certain layout properties will show all layout values even though IE s layout engine may ignore some of them.

Servlet Overview 217 Servlet Structure 219 Handling Requests 221 Providing Responses 225 Servlet Life Cycle 227 Writing Servlets 228 Servlet Wizard 228 XDoclet Servlet Annotations 232 Completing the Servlet Implementation 233 Summary 239.

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