The Transients API provides a standardized way to store data temporarily (with an expiration time) in the database.

learn more… | top users | synonyms

45
votes
3answers
11k views

Are transients garbage collected?

This question got me thinking Transient RSS feeds in wp_options not removed automatically? Transients are supposed to expire and be deleted. However the only way I see this handled is when transient ...
14
votes
3answers
8k views

How does object caching work?

I'm looking for a definitive answer here. When object caching is enabled, where do options and transients end up living? By default, both are stored in the database. But I've heard some references ...
14
votes
3answers
312 views

Should I use Transient API to store HTML String, or Object?

Let's assume that there is a plugin that displays 20 related posts (for each post) with a very complex query. And then using data from this query, it builds complex HTML layout. Also, should be noted ...
11
votes
5answers
1k views

When should I be using the Transients API?

I've never used the Transients API before and was wondering if anyone has guidance on when to use it. The Codex article implies that as a theme developer I might want to set each new WP_Query() as a ...
8
votes
3answers
646 views

Is there any danger in deleting all transients?

I have a big site for a client, and as it is a really customized wordpress installation with lots of extensions on functionality, I can't use the caching plugins. To improve the performance, I built ...
7
votes
2answers
1k views

Cache remote (HTTP) request with Transients API

I am trying to use get_transient() method in my Wordpress, I have read the document and seems like I am doing what has been described in the docs. I need to show weather in my website and I am using ...
6
votes
2answers
1k views

Using transients in conjunction with memcached

I was hoping someone could clear the air for me when it comes to using transients with memcached. When running a plugin like w3-total-cache, are there any actual performance advantages to using ...
6
votes
1answer
249 views

Why are transients cleared prematurely?

You would think that a transient set to expire at a certain time, would exist until that time. Unfortunately it seems they are disappearing from the database earlier, both on test and production. As ...
5
votes
2answers
596 views

Are transients private or public?

Are WP transients specific to the user-session or can they be accessed from any session anywhere? Since they are written to the DB, I would imagine they are public and accessible everywhere, but is ...
5
votes
1answer
188 views

Storing posts social counters by using transient api

I would like to know if it's a good practice to use transient api to cache social counters for every post. Loading post pages get quite slow while processing and getting all social APIs.
4
votes
5answers
15k views

Will it break my site if I delete all transient records in wp_options table?

My site currently has an outrageous 500k+ transient records in the wp_options table. This causes the table to be crashed frequently and so be my site. I thought transient records will all expired ...
4
votes
3answers
307 views

Fallback when Transient API fails

I'm trying to figure out how to best solve an issue I have with 3rd party API's (OG, Foursquare, Yelp, etc.). I use the transient API to call and store the various data in order to: Not exceed any ...
4
votes
4answers
1k views

Get a list of existing transients

I have been using transients a lot in WordPress since I discovered them, however to ensure my sites update properly when a post is edited or created I added a function to delete transients on post ...
4
votes
2answers
554 views

Does set_transient() overwrite/update transient option with same key?

Basically that's the question - I wonder if set_transient() overwrites/updates a transient option with the same key?
4
votes
1answer
421 views

Fragment caching increasing database queries

While implementing fragment caching on a wordpress site by using the technique described here: http://css-tricks.com/wordpress-fragment-caching-revisited/ I found that it seems to actually increase ...
3
votes
2answers
1k views

Best practices for using the transients API

I've recently come across the Transients API in Wordpress in hopes of improving the performance of the plugin that I'm trying to write. Basically the plugin is storing product details from the amazon ...
3
votes
2answers
2k views

wp-cron.php - How are WP's Cron transients removed?

I have a Wordpress Network that I am tasked with disabling the WP Cron and replacing it with an Apache Cron. I have set up a PHP script that when called by an Apache Cron will loop through all sites ...
3
votes
2answers
1k views

How to delete cached transients from a widget instance properly?

So I have created this widget which pulls a number of posts. And the query is being cached via transients. But I need the transient to be deleted whenever a post is saved so the query can be refreshed....
3
votes
1answer
51 views

Reset Transient on New Day

I have a plugin that interfaces with an API and am storing retrieved schedule data in a transient. Storing the transient for 24 hours: set_transient($schedule_cache, $schedule_data, 60 * 60 * 24); ...
3
votes
1answer
136 views

How to save new transients if query changes?

I am using WP REST API to pull blog posts into another site. Everything works great, but now I need to save the results into transients to prevent querying the blog every time. I am new to transients ...
3
votes
1answer
289 views

Should the caching of WordPress menus be specific to each page?

Introduction In optimizing large WordPress Websites for performance I always look at caching certain parts of the Website, mostly (of course) those that require a lot of Queries/calculation. For the ...
2
votes
4answers
612 views

Long option names fail silently?

This was really driving me crazy. I was debugging some code with code-generated transient names and they were failing like crazy for no apparent reason. After much much pain and experimentation I ...
2
votes
3answers
1k views

get_transient(), PHP switch(), and comparison operators

Im using a WordPress transient, which expires after an hour, to store a value which is an integer. Im trying to use switch() and multiple case() statements to evaluate if the transient exists or not (...
2
votes
1answer
368 views

Storing an XML Response (Transient)?

Haven't worked much with XML so I'm hitting a bit of a wall: function getapi() { $api_response = wp_remote_get( "http://example.com/getXML" ); $data = wp_remote_retrieve_body( $...
2
votes
1answer
301 views

Integrating WP-TLC-Transients with Wordpress - Where to Begin?

Last week, I asked about creating transients that would update before expiry to prevent users from waiting for the long loading time. I was pointed to WP-TLC-Transients which sound like exactly what ...
2
votes
1answer
89 views

How to use transients and variables

I am trying to implement transient fragments, I've been doing what is suggested here: http://css-tricks.com/wordpress-fragment-caching-revisited/ While it is working for headers, footers, landing ...
2
votes
2answers
524 views

Transient not working for custom loops

I'm working at a WordPress theme. Since I need to display featured posts, related posts, some widgets with recent posts and so on, I need to use multiple custom loops. Because of this, the number of ...
2
votes
1answer
627 views

Transient caching for wp query

I read about transient in the codex and some questions and answers here. So i'm developing a web app based on wp. It works now, but i want to optimize it. Users manage content regulary, so crud ...
2
votes
1answer
78 views

Is priming a Transient Cache possible?

I'm currently using Wordpress Transient Caching when querying images I've uploaded and tagged. Using Transient Caching has really sped up these queries once they are cached, but unfortunately, once ...
1
vote
3answers
595 views

Transients vs CRON +Custom Fields: Caching Data Per Post

Wanted some opinions on a solution I'm trying to come up with: I have a fan/enthusiast plugin I'm working on for fans of TV shows. One of the custom post types attached to the plugin is a release ...
1
vote
2answers
95 views

Transient API and caching Plugins

Hello wordpress NINJAS.... I am crazy about transient api and I have implemented it in my theme.My question is If I use transient api is it required caching plugin? (I hate plugins!!!) If I use ...
1
vote
1answer
92 views

How to cache posts based on $_GET? Option name is too long? Options / transients

I have a search feature set up that is fairly expensive and I want to cache the results, based on the $_get string, like: ?search_type=product&relation=or&date=all&s=tagsearch&merchcat=...
1
vote
1answer
2k views

WP_Query Performance Issues with meta_query

I'm working on a custom template for a new theme that uses a WP_Query instance to select posts from 2 post types with 2 custom fields that are NOT empty. Depending on the section of the site, a $...
1
vote
2answers
494 views

WordPress Caching - Transients API or “update_user_meta ” Cronjob?

I'm trying to set user meta based on queries. Basically, things like IF the query returns true, set this or if not, set this (or don't set it, if it is true). This works great but the problem is I ...
1
vote
1answer
166 views

How to delete transients written by fetch_feed()?

I'm using fetch_feed() to cache external rss sources displayed in a widget. in case the widget (or, more likely, the whole plugin) is deleted/deactivated, i want to manually delete all related ...
1
vote
1answer
124 views

Messing up with transient API - getting flushed on refresh

Following the _s theme I wanted to make my own version of Post Categories List with Transient, and here's what I made: function my_blog_categories() { global $post; if ( ( $...
1
vote
2answers
340 views

How to purge all transient caches?

Is there an easy way to delete all transient caches? A plugin maybe? Or like in drupal "drush cc all"?
1
vote
1answer
532 views

Using a wildcard with delete_transient()

I am using the Transients API to hold the output for a gallery plugin's shortcode I created. Due to the number of images used and different layouts needed, the transient name looks lik the following: ...
1
vote
2answers
401 views

Looping through posts per category gives same posts for each category

For a specific section on my website I loop through some categories and get the three latest posts in that categorie and list them. Like so: <?php $categories = get_categories(array('exclude' =>...
1
vote
1answer
100 views

Minimize database queries to user tables?

I'm trying to come up with a strategic way to collect large amounts of usermeta data (and output to the screen) while keeping database queries low. Some pages, like the home page, single pages, and ...
1
vote
2answers
91 views

Transient unique names

What would be the correct way to assign a different name to each transient for each instance of a plugin used as a widget or shortcode?
1
vote
1answer
89 views

Is this the proper usage of creating / using a transient?

I'm new to using transients. Is this the proper format to create a transient and have it pull from the DB instead of using the http api? I have standardized my snippet so others can double check ...
1
vote
1answer
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 ...
1
vote
1answer
463 views

How can I store an image in the database with Transients API?

I'm trying to store an image generated with imagecreatefrompng() using the Transients API, but it just stores an empty string (string(0) ""). Also, I notice if I set the transient before imagedestroy( ...
1
vote
1answer
55 views

Should I use the Transients API to temporarily hold edited attachements?

I'm building a store that allows users to order prints of photos. If the user orders a photo that has a different dimension than the one the photo is originally, they are prompted to crop the photo. ...
1
vote
1answer
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-...
1
vote
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 ...
1
vote
2answers
85 views

Delete transients in website

We have so many error happen on website (WordPress and Woocommerce) error log and it will show the following error message WordPress database error Deadlock found when trying to get lock; try ...
1
vote
1answer
56 views

What causes a transient to changes status to “Does Not Expire”?

I noticed that some transients on my site every now and then go from having an expiration date to "Does Not Expire". I have noticed this happening with some plugins (eg Gravity Forms) but also ...
1
vote
0answers
22 views

Which hook is fired when tag is added or changed? [duplicate]

I have a transient that collects WordPress tags with specific description. I'm looking for a hook name that fires when user edits a WordPress tag or creates a new tag in admin so I can delete my ...