Alternative Database Cache

This project is not covered by Drupal’s security advisory policy.

The Alternative Database Cache module is a drop-in replacement for Drupal Core's default cache implementation. Its goal is to fix long-standing problems with Drupal's core caching mechanism.

Improvements

	Drupal Core	ADBC
On cron, w/out minimum lifetime	Cache is wiped on every cron run	Cache is wiped at a configurable interval (default: once per 24hrs).
On cron, w/minimum lifetime set	Cron deletes all cache entries no more than once per cache_lifetime.	Cron deletes only cache entries older than cache_lifetime at a configurable interval.
On content change, w/out minimum lifetime	Page/block caches completely cleared every time content is saved.
On content change, w/minimum lifetime set	If page/block caches were last cleared more than cache_lifetime ago, both bins are emptied. Otherwise, no action is taken.	Page/block cache entries older than cache_lifetime are deleted.

Installation

Enable this module like you would any module, whether at /admin/modules or via drush.

In your settings.php file, you'll need to add the following lines to force Drupal to use the ADBC backend.

/**
 * ADBC settings.
 */
$conf['cache_backends'][] = 'sites/all/modules/adbc/adbc.cache.inc';
$conf['cache_default_class'] = 'AlternativeDrupalDatabaseCache';

You may need to change the path to adbc.cache.inc depending on how your site's structure is set up.
Once enabled, the module exposes a new "Cache garbage collection frequency" setting in the performance settings page. It defaults to 24 hours, but you may want to set this lower or higher depending on your needs.

Additional Reading

Project information

Module categories: Performance
16 sites report using this module
Created by iamEAP on 23 July 2012, updated 25 May 2016
This project is not covered by the security advisory policy.
Use at your own risk! It may have publicly disclosed vulnerabilities.