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Thiết kế web với joomla 1.6(5).x part 72

Quản lý hiệu quả và tiếp cận Hiệu suất và khả năng truy cập trang web của bạn cần được quan tâm chung cho tất cả các chủ sở hữu trang web. Chương này xem xét làm thế nào Joomla! có thể được tối ưu hóa cho hiệu suất tốt hơn và cách tiếp cận có thể được cải thiện thông qua quản lý tốt các bản mẫu và các nội dung | CHAPTER 2jL Managing Performance and Accessibility The performance and accessibility of your site should be common concerns for all web site owners. This chapter looks at how Joomla can be optimized for better performance and how the accessibility can be improved through good management of templates and content items. Although it may initially appear that no positive relationship between performance tuning and web site accessibility exists the opposite is true. Many of the items that improve the performance of a Web site are also consistent with improving the accessibility of a Web site. Indeed the bells and whistles that many site owners include in their sites can limit both the site s performance and its accessibility. IN THIS CHAPTER Understanding cache management Improving content performance Tuning Joomla performance Enhancing accessibility Understanding Cache Management Cache files are temporary files created and stored on the server that help to cut down on server load and improve performance times. When a file is cached the server can display the cached value instead of going through the effort of calling up the information from out of the database and assembling it for display. When site traffic is heavy the efficiency gained through caching can result in dramatic performance improvements. Joomla supports both global site caching and the ability to control caching for individual modules. You can also set the length of the time things are cached which tells the system how long to hold something before refreshing it. In some situations for example when you install an updated component you may want to dump your cached data in order to force the system to 701 Part V Site Maintenance and Management update the information in the cache. The Joomla admin system gives you the ability to flush the cache either completely or selectively. The Joomla cache management controls are split between the Global Configuration Manager the System - Cache plugin and the .