Drupal Cache Form

Drupal Clear Cache_form Table
Drupal Cache Control
Drupal Cache Form Extension
Drupal Cache Form Definition
Drupal Safe Cache Form Clear

4.6.x includes/bootstrap.inc cache_set()
4.7.x includes/bootstrap.inc cache_set()
5.x includes/cache.inc cache_set()
6.x includes/cache.inc cache_set()
6.x includes/cache-install.inc cache_set()

Stores data in the persistent cache.

Cache form Drupal change expire time. Ask Question Asked 6 years, 10 months ago. Active 3 years, 7 months ago. Viewed 1k times 2. Drupalflushallcaches is the function called from systemclearcachesubmit , the submission form handler called when you click on the 'Clear all caches' button, in the performance settings page. During cron tasks, systemcron clears the cache using the following code. If you'd like to clear an entire cache bin for database caches, regardless of the 'expire' value for a cached object, you need to do something like: cacheclearall('.', 'cachemymodulebin', TRUE); Providing an '.' for the first parameter tells the database cache interface's clear method to truncate the particular cache. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Stores data in the persistent cache. The persistent cache is split up into several cache bins. In the default cache implementation, each cache bin corresponds to a database table by the same name.

The persistent cache is split up into several cache bins. In the defaultcache implementation, each cache bin corresponds to a database table by thesame name. Other implementations might want to store several bins in datastructures that get flushed together. While it is not a problem for mostcache bins if the entries in them are flushed before their expire time, somemight break functionality or are extremely expensive to recalculate. Theother bins are expired automatically by core. Contributed modules can addadditional bins and get them expired automatically by implementinghook_flush_caches().

The reasons for having several bins are as follows:

Smaller bins mean smaller database tables and allow for faster selects andinserts.
We try to put fast changing cache items and rather static ones intodifferent bins. The effect is that only the fast changing bins will need alot of writes to disk. The more static bins will also be better cacheablewith MySQL's query cache.

Parameters

$cid:The cache ID of the data to store.

$data:The data to store in the cache. Complex data types will be automaticallyserialized before insertion. Strings will be stored as plain text and arenot serialized. Some storage engines only allow objects up to a maximum of1MB in size to be stored by default. When caching large arrays or similar,take care to ensure $data does not exceed this size.

$bin:(optional) The cache bin to store the data in. Valid core values are:

cache: (default) Generic cache storage bin (used for theme registry,locale date, list of simpletest tests, etc.).
cache_block: Stores the content of various blocks.
cache_bootstrap: Stores the class registry, the system list of modules,the list of which modules implement which hooks, and the Drupal variablelist.
cache_field: Stores the field data belonging to a given object.
cache_filter: Stores filtered pieces of content.
cache_form: Stores multistep forms. Flushing this bin means that someforms displayed to users lose their state and the data already submittedto them. This bin should not be flushed before its expired time.
cache_menu: Stores the structure of visible navigation menus per page.
cache_page: Stores generated pages for anonymous users. It is flushedvery often, whenever a page changes, at least for every node and commentsubmission. This is the only bin affected by the page cache setting onthe administrator panel.
cache_path: Stores the system paths that have an alias.

$expire:(optional) Controls the maximum lifetime of this cache entry. Note thatcaches might be subject to clearing at any time, so this setting does notguarantee a minimum lifetime. With this in mind, the cache should not beused for data that must be kept during a cache clear, like sessions.

Use one of the following values:

CACHE_PERMANENT: Indicates that the item should never be removed unlessexplicitly told to using cache_clear_all() with a cache ID.
CACHE_TEMPORARY: Indicates that the item should be removed at the nextgeneral cache wipe.
A Unix timestamp: Indicates that the item should be kept at least untilthe given time, after which it behaves like CACHE_TEMPORARY.

File

includes/cache.inc, line 141: Functions and interfaces for cache handling.

Code

Comments

To clear a specific cache item...

alanom commented

...pass $cid and $bin to the misleadingly named cache_clear_all()

Update Link

spuppett commented

Example of using cache in function

alandarev commented

Wrong expire time?

chrisroane commented

Shouldn't the expire time be added to the current time?

Like this:

Logic error

RogerB commented

cache_set() is being called on every invokation. It should only be called when the data is rebuilt.

Use REQUEST_TIME rather than

drewish commented

Use REQUEST_TIME rather than time().... but yeah you'd need to treat it as a timestamp so 360 would be some time in 1970.

Edit: this was supposed to be a reply to chrisroane's comment but I guess I clicked the wrong reply link.

Good catch!

chrisroane commented

Couldn't Get This to Work

chrisroane commented

The only way I could get the caching to work as expected in a custom function was to also use &drupal_static(__FUNCTION__) ....Below is a simplified version of what I got working:

General Cache Wipe Details

technicalknockout commented

The $expire option CACHE_TEMPORARY says

Indicates that the item should be removed at the next general cache wipe.

How is the next general cache wipe triggered? Is it triggered by cron jobs? Is it triggered every hour or every day?

cron

forestmars commented

@technicalknockout Yes, it happens on cron run by default, so how often depends on what you have cron set to.

General Cache wipe

xeeshangulzar commented

Is there any way that i can wipe cache after some minutes?

Try the Elysia cron module

bfr commented

Try the Elysia cron module for more fine grained control of the cron service. If that is not enough, implement cache_clear_all() or take a look at the code of drupal_flush_all_caches() for more ideas.

Not 100% sure but i think Rules could also do this.

Expire cache with Unix timestamp using strtotime()

sebas5384 commented

Example with strtotime(), maybe for a more clean and easy way for getting a cache to expire in 6 hours:

This way I can have a select form element with values like '+1 hour', '+6 hour', '+1 day', etc...

Cheers!

Very nice and clean example.

cbiggins commented

Poor Documentation

rvelhote commented

This is very lame but the $expire parameter, when set in a form of a Unix timestamp, is ignored if the parameter cache_lifetime set in admin/config/development/performance is not set to X minutes.

This will cause cache_get to return expired entries!

Sadly, the description for the cache_lifetime parameter is incorrect because it mentions 'cached pages' so one would assume that it's applicable to whole pages and not specific cache entries.

This is not documented and should not even happen otherwise it destroys the purpose of setting an expire parameter.

Expire does nothing

rcls commented

I can confirm there is an issue with the $expire parameter. I spent last night testing this issue out with a simple retrieval of data and storing it to the cache and setting the $expire to time() + 300 (5 minutes). I then printed out the time, the time the cache was set and expiration. The time the cache was set and expiration worked fine, but I noticed that even after 30 minutes this cache would still persist.

A simple way to go around this was to check if time() was bigger than the $cache->expire and then clearing out the cid with cache_clear_all(). An example code is below.

if ($cached = cache_get('db

rakesh.gectcr commented

if ($cached = cache_get('db_index', 'cache')) {
$tables = $cached->data;
}
else {
$tables = drupal_get_schema();
// Setting the data to drupal cache.
cache_set('db_index', $tables, 'cache', CACHE_TEMPORARY);
}

Jimmy Huang

Drupal

Founder, since 2006

NETivism

Founder, since 2009

jimmy at netivism.com.tw

User can see the lastest post

客戶說他的網頁不會更新

Display blank page randomly
隨機出現白畫面

My css effect has gone
CSS的效果不見了

Form can't submit.
本來正常的表單，卻再也送不出去了

Everyone saw broken page but not on my computer.
別人看網頁壞掉，但我看起來是好的

Why my counter not increase?
為什麼我的文章點閱沒增加？

Only a word comes to mind...

Logstalgia

Peopo.org

over 100,000 nodes (not many)
over 800,000 node-category relation
over 300 query in page (when no cache)
over 140 enabled drupal modules
heavy query (join large table)

31 ms for render page

to anonymous user

0ms for 304 not modified

376 ms for render page

to logged in user

Cache control in http header

Only for anonymous visitor
Tell browser take control of cache
Tell browser this page will expire after 21600s
Drupal already done in default:

read: drupal_serve_page_from_cache

Etag / Expires / Last Modified
in HTML header

Only for anonymous visitor
Etag:

Add unique id to delivered page

Last-Modified:

Used to detect if page modified since last visit.

Expires:

Setting by 'max-age' of heder cache-control

read: drupal_serve_page_from_cache

Static file cache in browser

Do not write CSS / Javascript in page
drupal_add_css in ALL PAGE
durpal_add_js should consider too

Nginx

Combination of proxy / static http file server

We won't hit Dynamic if we don't need
Extreme low in memory comsumption
Build-in cache mechanism
Build-in flood control mechanism

Asynchronous event-driven handle request

Eat ton of request in 1 process
More effective in multi-processor env

microcache in Nginx

Flood Protection / DOS protection
Short lifetime ( 1s - 5s )
Can used for logged user (use carefully)
Never hit PHP when continue hitting

read: microcache config on drupal-with-nginx

Boost.module of Drupal

Only for anonymous visitor
Static HTML page generation when first hit on PHP
Use rewrite rule (in Nginx or Apache) to redirect to HTML
Expired by

Cron
Crawler ( drupal 6 only)
Node update ( drupal 6 only )

Serve static html from nginx

10x faster than Apache prefork

nginx: 100,000 requests in 60s
apache: 10,000 requests in 60s

Drupal Clear Cache_form Table

What Drupal does from fresh hit?

Warm up PHP in every request

Load system wide variables
Load menu to check user have permission to access page
Load localized data to prepare translation strings
Load modules to prepare work
Render forms when needed
Gethering content in Blocks of page
Deliver page rendered by template / theme system
Finally we got an page! So slow...

Run SQL Query in every needs

OP Code Cache for PHP

Before: 104MB per page

Memory used at: devel_boot()=5.43 MB, devel_shutdown()=104.15 MB

Memory used at: devel_boot()=2.34 MB, devel_shutdown()=49.58 MB

OPcode cache in php-apc cache status

Drupal Cache Stack

almost cache everything

Page ( only for anonymous user )
Variables
Session cache ( 3 party module )
Localized string
Module info/registry
Template engine registry
Filtered content
Forms
Aggregated content (Block/Views/Panels)
Aggregated resource (CSS/JS/Image)

Core - Page Cache / Block Cache / CSS and JS cache

Views Cache (in period or ...)

Panels Cache (per page or ...)

Block Cache (set by module code)

Recommended Modules for cache

Memcache API and Integration or Memcache Storage

save cache into memcached (instead hitting database)

Views Content Cache

cache views based on content save
more effective because not time period

Panel Page Cache or Panel Hash Cache

cache panels based on url / user / content type

setting cache clear rules in simple clicks (with rules)

Claw specific pages you need.

Cache Strategy

You should look decent to different strategy for each block

cache in Time Period
cache per User
cache per Page (URL)
cache per User per Page
cache per Role per Page
others

cache per content type
cache per node
cache per role
...

Cache Clear Strategy

Expired after time period
Expired when new version exists

clear node cache when node update
clear views / panels cache when node update
clear user profile page when user update
clear term page when term update

Expired in specific URL parameter

Drupal Cache Control

Drupal is a Query Monster