Additionally, the Drush command cache is cleared with drush cache-rebuild , since that was one of the caches included in the old drush cache-clear command. Another method of clearing the cache is to truncate--or clear all the data from--the cache-related database tables. Confirm that you do when the alert pops up. Other database administrative programs will also have the ability to truncate tables.
Skip to main content. Last updated February 11, Site Administration 8. Goal Learn three methods of clearing Drupal's cache: via the administrative UI, with Drush, and by truncating tables in the database. Select the "clear all caches" button After successfully clearing the cache Drupal should display the message "Caches cleared. Add Performance page to Shortcuts Depending on your role, you may be clearing the cache a lot!
Open a Terminal window and cd to your Drupal site root If you're using Drush aliases , you can skip this step. Run the command drush cache-rebuild drush cr Wait for the command to successfully execute and return to your site.
Each object of the page contains metadata, and this piece of metadata tells the Internal Dynamic Page Cache module if it has to cache the page or not. You can change default metadata by Cache API. A cache has 3 properties. If you want to change default cache settings you can use them. These properties are the following. Context is a cache dependency on context, that creates variations when the render arrays are being generated. For example, one page for two different users may look different.
In this case, the context is the user. These contexts may be the user permissions, language settings or URL parameters. Tags define what object the cache depends on. Using cache tags you can automatically invalidate cached pages.
Constructing any object, you can change the cache settings to make it more flexible. You need to set your settings in rendering. In practice, it looks like that:. For the best possible cacheability of the highly dynamic parts of a page, you can use auto-placeholdering.
Drupal generates placeholders for dynamic content, and only at the very last moment, it is replaced with actual content. This allows Internal Dynamic Page Cache module to render the cache fragments except for the parts of the page that are too dynamic for caching. But we have one problem - Drupal shows a whole page at once, i. For solving this problem BigPipe has been developed. If found it can serve faster from its own cache otherwise it forwards the request to original web server.
Varnish could handle serving static files and anonymous page-views only. Additionally, you need to set Varnish as cache-backend for Drupal Refer varnish project page.
Also you need to configure Varnish to tell where it should listen to your web server. On user request, instead of regenerating pages from PHP, it can serve. It achieves this by modified. Pages that are served directly from boost will contain a short markup information at the end of the html code like. Boost module supports crawler automatically regenerates URLs for expired pages. It works well in shared hosting environment. Many Drupal users are reporting success using Memcached for authenticated page-views and Boost for anonymous page-views together.
CDN is a Geo-dispersed network that stores content closer to the user. It essentially reduces the latency between the end user and the server. Unlike the other caching options, a CDN will always involve an additional financial cost. There are several techniques to perform caching in Drupal. Efficient use of these methods could improve your site performance. A poor cache configuration could cause negative effects. Generally, one can figure out best possible caching configuration with the server resources available by trying them out for that particular website.
You can leverage full page caching for anonymous users using Varnish if you are having a dedicated server or Boost if on a shared server. APC OpCode cache generally does help with better low level performance tweaks. Cache for authenticated users can use Memcache reducing load on database. Drupal 8 performance gain: In Drupal 7, it is just possible to delete a specific cache item, or clear an entire cache bin, or use prefix-based invalidation.
It means if you modify a node, you cannot precisely target all the cache items that contain this node. But, Drupal 8 with the introduction of cache tags has more precise cache invalidation. Each cache item can have number of cache tags. This helps us to target our cache items more precisely for deletion, and an obvious gain in the cache hit ratio.
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