A cache is a component that transparently stores data so that future requests for that data can be served faster. The data that is stored within a cache might be values that have been computed earlier or duplicates of original values that are stored elsewhere.

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207 views

Get the timout value of a saved transient?

Does anyone know if there is a Wordpress function to get the timeout value of a saved transient? I am using a transient with a 5 minute timeout to cache data from a web API call locally. Between ...
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367 views

How many SQL queries WP Super Cache make to serve cached page?

WP Super Cache plugin generate page and save html of this page to static file and if needed this file is served instead of dynamically generate this page each time. Does WP Super Cache plugin make ...
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487 views

Transients API and multisite

we're using the Atlas HTML sitemap plugin, which caches the sitemap using the transients API with a call like: set_transient( 'dmac_html_sitemap', $output, 60*60*24*7 ); Now, we also have a multi-...
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2answers
682 views

How to set the cache for the built-in SimplePie feed parser?

I'm using the built-in SimplePie, AKA fetch_feed(), to retrieve a feed, and I want to be able to adjust the cache time from an admin menu. SimplePie itself is well documented, but not so much the ...
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1answer
2k views

How can I add Expire headers to images?

I'm trying to speed up my site a bit. How can I add Expire headers to images I upload? Must this be done with Apache configuration, or is there a setting or plugin to do the job?
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2answers
41 views

Clearing caches on plugin uninstall

When a plugin is uninstalled, it should remove all related data from the site (or network, if on multisite). If a plugin adds tables to the database, for example, it should remove those tables from ...
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1answer
52 views

Check if a user is connected and get is ID without fully loading wordpress

I'm writing an advanced cache for WP. I try to make it works with connected users. I want to calculate a user context hash. To build my hash I need a way to quickly know if the user is logged and get ...
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1answer
208 views

How many queries are normal to execute on a WP site?

I use the following PHP code in my theme's footer. <?php echo get_num_queries(); ?> queries in <?php timer_stop(1); ?> seconds. Then I realized that about 140 to 210 queries are ...
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1answer
46 views

How do I fetch feed info from cache instead of directly from feed?

I have been using SimplePie to fetch items from a feed and display them on an aside section on my site. I didn't notice before, but this was increasing the load time of the site by over 10 seconds. ...
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1answer
168 views

How to make a local cache of mshots images

I am using the Wordpress mshots api to generate automatic thumbnails of websites from the site url. I am using a customfield to capture the website url and pass the value to the mshots url to return ...
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1answer
123 views

How to enable Zend Optimiser+ with Batcache

I am using Batcache with APC Object Cache Backend so far. A lot of posts on internet claiming that using Zend Optimizer instead of APC would reduce CPU and memory usage. I could enable Zend ...
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1answer
170 views

Dynamic Stylesheet loads but doesn't finish

I am creating a website for an architect with large images being a main feature of the site. Given the potential size of the images I wanted to have a way to create responsive image sizing (and of ...
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3answers
554 views

Prevent installation of style.css cookies and file caching

I'm having a problem which I have never encountered before. When I update my style.css file within my child theme, the webpage does not use the new style. I have pinpointed that to a cookie within ...
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1answer
548 views

Correct way to perform non-cacheable DB query

Consider the code function getNow() { global $wpdb; $now = $wpdb->get_var("SELECT NOW()"); $wpdb->flush(); return $now; } I am using the above method to avoid caching ...
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1answer
50 views

Comment Moderation and CDN Caching

I work on a site that is entirely cached by a CDN. We are about to roll out comments and will be moderating every comment before it goes live. When someone posts a comment and the page is rendered ...
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2answers
107 views

How can I revert to showing cached pages when no database connection is available? [closed]

I don't know much about how super cache works, but I see that at the very least, I can find most of the pages of my site in the wp-content/cache/supercache folder. Now, if WordPress cannot connect to ...
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1answer
614 views

Caching-Plugins and Ajax-Page-Parts

I'd love to use »W3 Total Cache« for my Wordpress page. Caching the full page is really fasten up the site. But there is a lot of current community activity and most pages including some "latest ...
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1answer
699 views

Headway body classes and W3TC page cache conflict [closed]

I'm currently working on a website using WordPress, Headway, Modernizr and W3 Total Cache. The problem I'm having is that W3TC is caching the body tag, which means that this isn't being updated ...
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1answer
194 views

Reasonable Size Limit to options entry

I have a set of ~4700 records that I need to have locally searchable for my plugin via an auto-complete (it's the Google Product Search categories). Would it be okay to store this data in the options ...
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1answer
248 views

Mixing Tweets with Posts

I have a client who wants their blog to display both Posts and Tweets in chronological order. These should be mixed into the same feed. I didn't find any plugins that accomplished this, although there ...
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1answer
68 views

Is the object cached?

I have a function to instantiate a class to provide var access to other functions. function my_data(){ global $post,$the_data; $postid = get_the_ID(); $the_data = new MY_Class ( $postid ); return $...
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1answer
568 views

Transient / object cache maximum key length [duplicate]

Possible Duplicate: Long option names fail silently? The WordPress Transients API makes it easy to save expensive values and look them up later. If you install an object backend (such as APC ...
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2answers
192 views

How to find time last viewed?

I want to run an update script on pages that haven't been viewed and updated within X days. I'm using post meta to cache some related RSS feed data, and I want it updated once a week or two, but only ...
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1answer
135 views

Plug-in Conflict: Art Direction and Super Cache

I use Art Direction plugin to create customized posts sometimes. I also want to use Super Cache plugin for traffic spikes. However I've found that once you have Supercache activated Art Direction ...
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1answer
10 views

cache specific data?

I want to display some information from database in each post, for example date of registration of user and user role etc. It is quite static data that doesn't change. Now if I make a query to the ...
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2answers
329 views

Live website is not showing the changes I've made [closed]

I used to have my website hosted through Godaddy and 4 months ago something weird started happening. Every time that I would make changes to my site, it wouldn't show up on the live website. The only ...
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1answer
219 views

get_post_meta causes database queries

I want to know why my site's search results are slow. I've used the excellent Debug Bar plugin, and found out that each search result causes 5 DB queries, of which 3 are SELECT meta_key (see below for ...
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15 views

Can we turn off Wordpress `transient` cache? [duplicate]

When studying Wordpress, I notice that a lot of database changes are on wp_options table - a closer monitor will show that a lot of transient related changes are made. I wonder if we can turn off ...
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1answer
63 views

Hook an action when a transient is deleted ? Can't get it to work!

I'm working on a plugin, and it caches a remote page when requested. The file is created with tempnam(). I save the path of that cached file in a transient, using the transient API. Once the ...
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402 views

Run oembed separately outside the_content()

I have this structure for my content.php : <div class="featured"> <!--featured image here--> </div> <h1 class="entry-title">Post Title</h1> <div class="entry-...
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1answer
138 views

How to prevent/delay MySQL connections when an object cache is used?

We are using an object cache backed by memcached, however I think that WordPress will still connect to MySQL on every page load, which shouldn't be needed if all queries can be handled by the object ...
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0answers
603 views

Wordpress PHP 5.5 and OPcache

I have tried to run on my Apache 2.4 and PHP 5.5 OPcache. My admins turned it on for me but the site was not faster - it was slower. Is there a how-to somewhere or a code snipet needed in WordPress ...
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0answers
189 views

Cache issues with redis and nginx

I have a problem with the rewrite rules in my nginx config file. I am running wordpress with nginx and redis to cache the site. I can get the redis to cache all pages not a problem, but as I am ...
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116 views

Index page and random posts needs a forced refresh in order to show new content

I have this weird problem with both on desktop and mobile, which requires a manual refresh in order for the index-page to show new posts. It also appears as if the user is not logged in. Basically, I ...
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1answer
623 views

Batcache messages no longer in page source

I have placed advanced-cache.php and object-cache.php in wp-contents and updated wp-config.php with define('WP_CACHE', true);, but I do not see the messages in the page source telling me that the page ...
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2answers
3k views

W3 Total Cache doesn't detect memcached [closed]

I have a wordpress installation (latest version) running on a debian server with memcached and php5-memcached installed (memcache appears on phpinfo()), but W3 Total Cache doesn't seem to recognize it,...
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0answers
238 views

.htaccess browser caching and user login [closed]

I have a site that involves user logins for certain content. I am leveraging browser caching in the .htaccess file. When a user logs in, they are redirected to a profile page. The problem I'm having ...
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2answers
573 views

How to optimize 'select found_rows()' query? Several 'high load average' alerts daily

I have 5,000 regular posts, 6,000 posts in one post type and 2,000 posts in another post type. Needless to say, that has made the wp_posts table quite large. Not to mention, I have custom taxonomies ...
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1answer
876 views

Some custom taxonomy child terms not showing in admin. Caching problem?

I have a problem with some custom taxonomy terms. I am using "Types" plugin for creating custom post types and custom taxonomies. I successfully created my postype and hierarchical taxonomy and ...
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0answers
231 views

After having installed APC Object Cache Backend transients stopped working

My understanding is that once you enable the persistent object cache, your transients are no longer stored in wp_options but in the cache. Once I installed Mark Jaquith's APC Object Cache Backend, ...
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0answers
36 views

Caching RSS plugin data

I'm developing plugin and I need it's data to be cached, let's assume that it's large RSS feed grabber. Basically data of one RSS feed is about 100 lines of parsed HTML code (about 2KB). On one page ...
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0answers
473 views

WP-Super-Cache - generate cache programmatically [closed]

I wonder if there is possibility to generate WP-Super-Cache programmatically after the cache is being purged ( after I have published a new post ). I thought of writing some kind of crawler that will ...
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1answer
61 views

WordPress cache feeds

I would like to implement a custom cache for all the feeds in my site. The rss requests are very intensive and I have a big db load. Do anyone know of a good action before running the rss query so I ...
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3answers
2k views

w3 Total Cache not Caching - Requested URI is rejected [closed]

For some reason Total Cache does seem to be caching my pages. Each time I got to a page, when I view source, the Total Cache comment shows that it regenerated the page for this request. What worse, ...
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3answers
1k views

What hooks to hook onto for automatic cache clearing

I have a WP-site with not that many writes, but quite a few reads and a few specific hotspots in the templates that I'd like to cache pretty aggressively with my own PHP-caching mechanism. I could ...
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1answer
963 views

Getting soft 404 errors (200 status) when caching plugins are enabled

I have a blog running the latest stable version of WordPress on a dedicated virtual server with the following situation. (Replace [caching plugin] with W3 Total Cache, Hyper Cache, or Quick Cache, as ...
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0answers
151 views

My WordPress site always displays a cached version of its homepage

I have a WordPress site that runs fine, but there's a strange behaviour: one a reader loads the page, the site shows a "cached" version of the site, with the same news and comment numbers that the ...
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3answers
1k views

My WordPress site always displays a cached version of its homepage

First of all, sorry if I'm making a mistake. I already asked this on the ServerFault forum, but got no answers at the moment and I thought it would be a good idea to ask the question here, considering ...
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1answer
425 views

w3 total cache and sitemap.xml

I have been installing lately w3 total cache on my wordpress site and today webmaster tools has been mailing an error by sitemap.xml crawling. Sitemap ist HTML. Is anybody experienced this issue with ...
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3answers
150 views

Fixed version number for cached stylesheets and javascript

Unless i use: wp_enqueue_style( 'dazzling-style', get_template_directory_uri() . '/css/main.css?ver=', array(), rand(10,99999), 'all' ); Then everytime I visit my site, be it local or live, I see ...