To disable the dispatcher cache on a page template in AEM, you need to add the nocache property to the template node in the CRX repository. This can be done by navigating to the template node in CRXDE Lite or CRX Explorer, and adding the property nocache with a value of true. This will prevent the dispatcher from caching the page output based on that template. Additionally, you can also set cache headers in the response at the servlet level to control caching behavior.
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What is the impact of disabling dispatcher cache on website performance?
Disabling dispatcher cache can have a negative impact on website performance, as it can lead to slower page load times and increased server load. When the dispatcher cache is disabled, every request for a page or resource must be processed by the server, which can slow down response times and increase the amount of server resources required to fulfill requests.
Additionally, disabling the dispatcher cache can lead to increased network traffic, as the server must retrieve and process content for each request, rather than serving cached versions of pages and resources. This can result in higher bandwidth usage and slower loading times for users.
Overall, disabling the dispatcher cache can have a significant impact on website performance, so it is important to carefully consider the implications before making this change.
What is the relationship between caching headers and dispatcher cache in AEM?
Caching headers play an important role in determining how web browsers and content delivery networks cache and serve content to users. When a user requests content from a website, the caching headers instruct the browser on how to cache and reuse that content for subsequent requests. This can help improve website performance by reducing the amount of data that needs to be sent from the server to the browser.
In AEM, the Dispatcher cache is a built-in cache mechanism that stores static and dynamic content from the AEM author instance and serves it to users. The caching headers set in AEM can control how the Dispatcher cache stores and serves content. By setting the appropriate caching headers in AEM, administrators can control how long content is cached in the Dispatcher cache, how it is invalidated, and how it is served to users.
In summary, the relationship between caching headers and the Dispatcher cache in AEM is that the caching headers configured in AEM determine how content is cached and served by the Dispatcher cache. By setting proper caching headers, administrators can optimize website performance and improve user experience.
How to configure cache invalidation rules in AEM?
To configure cache invalidation rules in AEM, you can follow these steps:
- Log in to the AEM author instance as an administrator.
- Navigate to the configuration manager by clicking on Tools -> Operations -> Web Console.
- In the Web Console, search for the “Adobe Granite HTML Library Manager Configuration” configuration.
- Edit the configuration of the HTML Library Manager by clicking on the “View Details” button.
- In the configuration editor, under the “Client Libraries” section, you can configure cache invalidation rules for specific client libraries.
- To define cache invalidation rules, you can use the following syntax: path=pattern,expires=n,selectors=selector_list path: the absolute path of the resource that should trigger cache invalidation pattern: the regular expression pattern that the path should match expires: the expiration time for the stored version of the resource in the client library selectors: the list of selectors that should trigger cache invalidation
- Once you have defined the cache invalidation rules for the client libraries, save the configuration changes.
- Test the cache invalidation rules by accessing the resource and verifying that the cache is properly invalidated based on the configured rules.
By following these steps, you can configure cache invalidation rules in AEM to ensure that the cached versions of resources are invalidated when necessary.
What is the purpose of disabling dispatcher cache on page templates in AEM?
Disabling dispatcher cache on page templates in AEM (Adobe Experience Manager) allows for real-time content updates and changes to be reflected immediately on the website without the need to wait for the cache to expire or be cleared. This is important for websites that require frequent updates or have dynamic content that needs to be shown to users in real-time. By disabling dispatcher cache on page templates, the website can remain responsive and up-to-date with the latest content changes, ensuring a better user experience.
What is dispatcher cache in AEM?
Dispatcher cache in Adobe Experience Manager (AEM) is a feature that allows for the temporary storage of static content and assets on the dispatcher server. This helps to improve the performance of the website by reducing the load on the AEM server and decreasing the time it takes to load pages for users.
The dispatcher cache stores copies of frequently-accessed static content, such as images, CSS files, and JavaScript files, so that they can be served quickly to users without having to be generated by the AEM server each time. This helps to reduce the amount of server resources needed to serve content and can greatly improve the overall speed and performance of the website.
Additionally, the dispatcher cache can be configured to invalidate and refresh cached content based on certain criteria, such as time-based expiration, manual purging, or changes to the content in AEM. This ensures that users are always served the most up-to-date content while still benefiting from the performance improvements provided by the cache.
What is the impact of cache invalidation on AEM performance?
Cache invalidation plays a crucial role in determining the overall performance of an AEM (Adobe Experience Manager) system. When a cache is invalidated, it means that the stored data in the cache becomes outdated and needs to be replaced with fresh data. This process can have both positive and negative impacts on performance:
- Positive impact:
- Improved data accuracy: Cache invalidation ensures that users always have access to the most up-to-date information, leading to improved data accuracy.
- Reduced cache pollution: Invalidation prevents the cache from becoming filled with outdated or unnecessary data, ensuring that only relevant information is stored in the cache.
- Accelerated performance: By refreshing the cache with new data, invalidation can actually improve the system's performance by allowing it to serve up-to-date content more quickly.
- Negative impact:
- Increased load on the system: When cache invalidation occurs, the system may experience a spike in requests for fresh data, which can put additional strain on servers and potentially slow down the overall performance.
- Temporary performance dip: While the cache is being invalidated and new data is being fetched, users may experience a temporary dip in performance as the system works to refresh the cache.
Overall, the impact of cache invalidation on AEM performance can vary depending on the frequency of invalidation, the size of the cache, and the efficiency of the invalidation process. Properly managing cache invalidation is essential for ensuring optimal performance and user experience in an AEM system.
