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Flushing a cache is a fancy word for deleting the cache. Deleting a cache simply means that it will be rebuilt the next time a person requests the relevant section of the website. It's something you might want to do if you have recently updated content and you want to make sure that the website is showing the very latest information.
Content Cache Detail
Drilling down on a content cache block or category shows all of the specific caches in that block. From here you can individually delete cache items, or drill down further to see the actual fragment of HTML in the cache.
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For example:
<<< Content Cache start (_body_CA9F4090-B0D0-E16E-5B0158F9D9FD2779) ::::
(timeout 15:00)>>>
The period of time the cache will remain in place before it is recreated.
Q. What if I just want to preview my content? Do I have to worry about
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the cache?
When you request "Preview" from a content items overview page, any
template caching on that page is automatically flushed.
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Yes. If you are logged in to FarCry and can see the "floater menu" in
the top left hand corner of the screen, you can select "Show Latest" to
flush caches on pages you are browsing.