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Drupal does a lot of work in the database, especially for authenticated users and custom modules. It is common for the database to be the cause of the bottleneck. Here are some basic strategies for optimizing Drupal s use of the database.

implementations in the Apache Commons Database Connection Pool (DBCP). You can download the JAR file from http://commons.apache.org/collections.

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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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.

A user has placed multiple fingers on the screen and has begun a movement. The user is in the process of moving multiple fingers in a scale or rotation. The user has completed the scale or rotation by removing fingers.

This application is running on a BlazeDS server and requires the following JAR files, along with the JARs installed with your BlazeDS server: commons-codec-1.3.jar commons-collections.jar commons-dbcp-1.2.2.jar commons-httpclient-3.0.1.jar commons-logging.jar commons-pool-1.4.jar concurrent.jar mysql-connector-java-5.1.7.jar spring.jar

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

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.

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

Those are the basic building blocks for our application. It is ready to access data from the MySQL database. The first data persistence solution we will explore uses JDBC.

During the gesture, the event handler is free to check the rotation and scale properties of the corresponding event and update the display accordingly. Listing 11-1 shows an example usage of the gesture handlers. Listing 11-1. Example Gesture Handler function gestureChange(event) { // Retrieve the amount of change in scale caused by the user gesture // Consider a value of 1.0 to represent the original size, while smaller // numbers represent a zoom in and larger numbers represent a zoom // out, based on the ratio of the scale value var scale = event.scale; // Retrieve the amount of change in rotation caused by the user gesture // The rotation value is in degrees from 0 to 360, where positive values // indicate a rotation clockwise and negative values indicate a counter// clockwise rotation var rotation = event.rotation; // Update the display based on the rotation. } // register our gesture change listener on a document node node.addEventListener("gesturechange", gestureChange, false); Gesture events are particularly appropriate in applications that need to manipulate objects or displays, such as in diagramming tools or navigation tools.

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