only clear part of full page cache

Question

i'm using memcache and redis. is it possible to clear only a certain page or group of pages using these? Howso? For example i'd like to be able to only clear the homepage instead of the entire FPC.

Thanks.

Answer 1

If you know the tags of the pages you can remove only those using

    $cache = Mage::app()->getCache();
    foreach($cache->getTags() as $tag){
        if(strpos($tag, 'my_cache_tag')){
            $ids = $cache->getIdsMatchingAnyTags(array($tag));
            foreach($ids as $id){
                $cache->remove($id);
            }
        }
    }

This can also be used to find out the keys you want to delete inspecting the content of the $cache->getTags() object. Source here.

Here is a good guide for Magento cache management too.