Title: Refresh cache for single page Last modified: March 12, 2019 --- # Refresh cache for single page * Resolved [Mike Clarke](https://wordpress.org/support/users/rawthey/) * (@rawthey) * [7 years, 7 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/) * Is there any way for a PHP script in my theme to force a single page to be refreshed in the cache? * We have a page for an events calendar which uses a PHP script to show current and future events in our area. To ensure that events in the past are not displayed we clear the cache for that page every night from a cron job using * `$GLOBALS['wp_fastest_cache']->singleDeleteCache(false,$post_id)` * This works OK but performance issues on our server can result in the first request for this page each day being very slow so I’d like to be able to arrange for our cron job to force the page to be cached immediately after clearing it. - This topic was modified 7 years, 7 months ago by [Mike Clarke](https://wordpress.org/support/users/rawthey/). Viewing 14 replies - 1 through 14 (of 14 total) * Plugin Author [Emre Vona](https://wordpress.org/support/users/emrevona/) * (@emrevona) * [7 years, 7 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11303851) * I recommend you to enable “Restart After Completed” option of preload feature. Thus you don’t have to clear cache every night. * [https://www.wpfastestcache.com/features/restart-preload-after-completed/](https://www.wpfastestcache.com/features/restart-preload-after-completed/) * And you need to use the preload manually as below to get the best performance for preload feature. * [https://www.wpfastestcache.com/features/manually-preload-with-cron-jobs/](https://www.wpfastestcache.com/features/manually-preload-with-cron-jobs/) * Thread Starter [Mike Clarke](https://wordpress.org/support/users/rawthey/) * (@rawthey) * [7 years, 7 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11304495) * Thank you for the suggestions. * I was under the impression that selecting the “Restart After Completed” option would result in the preload process running continuously after all the cache files are created. Is that correct? Most of our pages don’t change very often and we already have “Clear cache of post / page” selected for the “Update Post” option so continually preloading everything is a bit of an overkill. * The idea of using wget -O – “[http://www.YOUR-URL.com/?action=wpfastestcache&type=preload”](http://www.YOUR-URL.com/?action=wpfastestcache&type=preload”); >/dev/null 2>&1 in a cron job as suggested in your second link could be a possibility but am I correct in thinking that this can only be used to preload the entire site and not individual pages? However it looks like I could just use wget to fetch my page after deleting it from the cache and this would result in it being cached again. * Plugin Author [Emre Vona](https://wordpress.org/support/users/emrevona/) * (@emrevona) * [7 years, 7 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11305327) * > I was under the impression that selecting the “Restart After Completed” option > would result in the preload process running continuously after all the cache > files are created. Is that correct? * yes. * > Most of our pages don’t change very often and we already have “Clear cache > of post / page” selected for the “Update Post” option so continually preloading > everything is a bit of an overkill. * you don’t need to enable either “update post” nor “new post” options if you enable“ restart” option of preload. * > The idea of using wget -O – “http://www.YOUR-URL.com/?action=wpfastestcache& > type=preload” >/dev/null 2>&1 in a cron job as suggested in your second link > could be a possibility but am I correct in thinking that this can only be used > to preload the entire site and not individual pages? * yes, entire site. * > However it looks like I could just use wget to fetch my page after deleting > it from the cache and this would result in it being cached again. * I wanted to show you a method. You don’t need to clear any single page with this method. * [Frank](https://wordpress.org/support/users/t-mug/) * (@t-mug) * [7 years, 7 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11315446) * Hi, it’s a bit counter intuitive for me as well. I struggle with the same thing. What’s the sense of beeing able to periodically deleting a certain page if afterwards the enabled preload would apply to the whole site anyway? * So it seems that preloading is always meant as renewing **all** cached files and is not meant to cooperate with the feature of periodic deletion of certain pages. So you **cannot** selectively preload, am I right? * The counter intuitive part for me is that “selecting” all pages for deletion after a certain amount of time will cause the preload process to start. But if you “select” a page (which is kind of the same context for me), then nothing happens, because it’s waiting for the next unfortunate visitor … 🙂 * Thanks anyway! Do I interpret things properly, so far? * Thread Starter [Mike Clarke](https://wordpress.org/support/users/rawthey/) * (@rawthey) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11340571) * Emre Vona wrote: * > I recommend you to enable “Restart After Completed” option of preload feature. > Thus you don’t have to clear cache every night. * I’ve tried out this option and it’s made an improvement to the way things work but there’s some issues I’m still a bit uncertain about. * We currently have 578 items cached. With the preload option set to process 6 pages per minute that should take about 8 hours to refresh the entire cache with the wp_fastest_cache_Preload cron task firing every 5 minutes. So there’s a chance that our events page could still be showing the previous day’s version even if I delete it from the cache in the middle of the night. However I’ve been monitoring the cache contents for a few days and it looks like the events page gets refreshed in the cache within a couple of hours of my daily cron task which deletes it from the cache. Does the preload system give priority to pages which are not cached or have I just been lucky? * Despite my estimate of 8 hours to refresh the entire cache I see some files in the cache which are several days old. I think this is a side effect of the way that we deal with old events. In order to avoid getting ‘404’ errors when people follow search engine results pointing to events which happened in the past we don’t delete these from the system, instead the page issues a 301 redirect to a page which informs the visitor that the event took place in the past and where possible we provide links to similar events which might be of interest. It appears that when the preload feature follows the redirect it leaves the cached copy of the original page in place instead of deleting it. Would it be possible for WP Fastest Cache to remove an item from the cache if it detects that the item is not available or results in a redirection? I appreciate that my pages affected by this are very much a special case and can workaround the problem if this isn’t possible. * Plugin Author [Emre Vona](https://wordpress.org/support/users/emrevona/) * (@emrevona) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11341520) * did you add cron-job as below? [https://www.wpfastestcache.com/features/manually-preload-with-cron-jobs/](https://www.wpfastestcache.com/features/manually-preload-with-cron-jobs/) * Thread Starter [Mike Clarke](https://wordpress.org/support/users/rawthey/) * (@rawthey) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11399087) * > did you add cron-job as below? > [https://www.wpfastestcache.com/features/manually-preload-with-cron-jobs/](https://www.wpfastestcache.com/features/manually-preload-with-cron-jobs/) * No, I appreciate that I’d get more control over the timing instead of relying on the WoedPress scheduler but I’ve been running for a while now with the ‘restart’ option set and things seem to be running OK with updates at a fairly regular 5 minute interval. Using cron I could run it more frequently but don’t want to put too much load on the system. * There’s still a few oddities with some existing unchanged cached pages being refreshed while there were still uncached pages to be processed. Also a small number of pages stay in the cache for up to three days before being refreshed, But overall the cache appears to be doing what I need so I’ll leave things as they are. * Plugin Author [Emre Vona](https://wordpress.org/support/users/emrevona/) * (@emrevona) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11399743) * maybe browser caching causes this issue. Did you try via [https://www.browserling.com/](https://www.browserling.com/) before? * Thread Starter [Mike Clarke](https://wordpress.org/support/users/rawthey/) * (@rawthey) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11416491) * > maybe browser caching causes this issue * No, my observations were based on the timestamps on the files in the cache directory. * Plugin Author [Emre Vona](https://wordpress.org/support/users/emrevona/) * (@emrevona) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11418925) * did you check the timestamp via [https://www.browserling.com/](https://www.browserling.com/)? * Thread Starter [Mike Clarke](https://wordpress.org/support/users/rawthey/) * (@rawthey) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11420578) * > did you check the timestamp via [https://www.browserling.com/](https://www.browserling.com/)? * No I logged into the server via ssh and ran `find public_html/wp-content/cache/ all -type f -ls | sort -k 9 | less` to get file details sorted in date order - This reply was modified 7 years, 6 months ago by [Mike Clarke](https://wordpress.org/support/users/rawthey/). * Plugin Author [Emre Vona](https://wordpress.org/support/users/emrevona/) * (@emrevona) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11422926) * can you tell me a sample url please? * Thread Starter [Mike Clarke](https://wordpress.org/support/users/rawthey/) * (@rawthey) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11437947) * > can you tell me a sample url please? * The site is [https://www.sedbergh.org.uk](https://www.sedbergh.org.uk) * There’s currently 591 pages in the cache and the preload with restart after completion option is selected. With 6 pages every 5 minutes the entire site should be cached in about 8 hours. We do however have a number of pages for events which occurred in the past (e.g. [https://www.sedbergh.org.uk/view-event/history-society-the-yards-of-kendal/](https://www.sedbergh.org.uk/view-event/history-society-the-yards-of-kendal/)) and these redirect to a page offering suggestions for alternatives, this page is not cached. These extra ‘dead’ events result in more than 591 pages being checked but I’d still expect the entire cache to be refreshed within one day but we currently have pages in the cache from 2 days ago. Here’s the first few lines from a directory list of all cached pages sorted in increasing date order( with user and group ID obfuscated) * ``` 248031481 39 -rw-r--r-- 1 ######### ##### 38851 Apr 15 12:52 public_html/wp-content/cache/all/activities/things-to-do-around-sedbergh/a-walk-to-akay-woods/index.html 817646536 32 -rw-r--r-- 1 ######### ##### 31507 Apr 15 13:16 public_html/wp-content/cache/all/community/index.html 1085025119 28 -rw-r--r-- 1 ######### ##### 27890 Apr 15 19:50 public_html/wp-content/cache/all/view-event/amenities-committee/index.html 1068103848 35 -rw-r--r-- 1 ######### ##### 35030 Apr 15 20:06 public_html/wp-content/cache/all/search/map/page/2/index.html 1081113542 30 -rw-r--r-- 1 ######### ##### 29211 Apr 15 20:09 public_html/wp-content/cache/all/search/admin/index.html 1081114494 34 -rw-r--r-- 1 ######### ##### 34051 Apr 15 20:10 public_html/wp-content/cache/all/search/map/index.html 294330742 28 -rw-r--r-- 1 ######### ##### 28149 Apr 15 20:10 public_html/wp-content/cache/all/search/map/page/3/index.html 294331226 31 -rw-r--r-- 1 ######### ##### 30366 Apr 15 20:10 public_html/wp-content/cache/all/search/parking\ permit/index.html 1126852735 35 -rw-r--r-- 1 ######### ##### 34680 Apr 16 00:36 public_html/wp-content/cache/all/accommodation-detail/russell-cottage/index.html 1087493208 30 -rw-r--r-- 1 ######### ##### 29352 Apr 16 01:01 public_html/wp-content/cache/all/locations/barry-mckay-appleby/index.html 1087494129 30 -rw-r--r-- 1 ######### ##### 30084 Apr 16 01:01 public_html/wp-content/cache/all/locations/daisyroots-books-grange-sands/index.html 1087492667 29 -rw-r--r-- 1 ######### ##### 28851 Apr 16 01:01 public_html/wp-content/cache/all/locations/pages-books-settle/index.html ``` * And the most recent entries from the end of the list: * ``` 505814688 29 -rw-r--r-- 1 ######### ##### 28756 Apr 17 09:45 public_html/wp-content/cache/all/banners/lakes-panorama/index.html 1271696260 29 -rw-r--r-- 1 ######### ##### 28661 Apr 17 09:46 public_html/wp-content/cache/all/banners/castle-hill/index.html 1271696991 29 -rw-r--r-- 1 ######### ##### 28998 Apr 17 09:46 public_html/wp-content/cache/all/locations/dales-countryside-museum-hawes/index.html 1316094697 35 -rw-r--r-- 1 ######### ##### 34340 Apr 17 09:56 public_html/wp-content/cache/all/view-event/sedbergh-artisan-market-18/index.html 1316092262 33 -rw-r--r-- 1 ######### ##### 32753 Apr 17 09:56 public_html/wp-content/cache/all/view-event/sedbergh-artisan-market-19/index.html 1316095845 35 -rw-r--r-- 1 ######### ##### 34997 Apr 17 09:57 public_html/wp-content/cache/all/view-event/sedbergh-artisan-market-16/index.html 1316095536 35 -rw-r--r-- 1 ######### ##### 34583 Apr 17 09:57 public_html/wp-content/cache/all/view-event/sedbergh-artisan-market-17/index.html 1307866353 35 -rw-r--r-- 1 ######### ##### 35058 Apr 17 10:00 public_html/wp-content/cache/all/view-event/sedbergh-artisan-market-15/index.html 1307867714 30 -rw-r--r-- 1 ######### ##### 29772 Apr 17 10:01 public_html/wp-content/cache/all/view-event/antiques-fair/index.html 1314524776 31 -rw-r--r-- 1 ######### ##### 30462 Apr 17 10:17 public_html/wp-content/cache/all/view-event/farfield-mill-free-entry-to-locals/index.html 1292158275 30 -rw-r--r-- 1 ######### ##### 29188 Apr 17 10:18 public_html/wp-content/cache/all/view-event/fish-chips-in-dent/index.html 994960231 259 -rw-r--r-- 1 ######### ##### 136267 Apr 17 10:26 public_html/wp-content/cache/all/community/parish-council/meetings/index.html ``` - This reply was modified 7 years, 6 months ago by [Mike Clarke](https://wordpress.org/support/users/rawthey/). * Plugin Author [Emre Vona](https://wordpress.org/support/users/emrevona/) * (@emrevona) * [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11440417) * do you mean that the preload works slowly? Viewing 14 replies - 1 through 14 (of 14 total) The topic ‘Refresh cache for single page’ is closed to new replies. * ![](https://ps.w.org/wp-fastest-cache/assets/icon-256x256.png?rev=2064586) * [WP Fastest Cache - WordPress Cache Plugin](https://wordpress.org/plugins/wp-fastest-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-fastest-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-fastest-cache/) * [Active Topics](https://wordpress.org/support/plugin/wp-fastest-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-fastest-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-fastest-cache/reviews/) ## Tags * [cache](https://wordpress.org/support/topic-tag/cache/) * [php](https://wordpress.org/support/topic-tag/php/) * 14 replies * 3 participants * Last reply from: [Emre Vona](https://wordpress.org/support/users/emrevona/) * Last activity: [7 years, 6 months ago](https://wordpress.org/support/topic/refresh-cache-for-single-page/#post-11440417) * Status: resolved