I have played around the the Drupal Cache module - and could not even get it started with the default (simplest comfiguration when used according to the documentation.

The original states:

Installation
1. Enable "Cache" (from "Cache" package) module on
Admininster -> Site building -> Modules page.

2. SETUP WEB-SITE'S settings.php CONFIGURATION FILE

Add the following lines to your settings.php:

    $conf['cache_inc'] = './sites/all/modules/cache/cache.inc';
    $conf['cache_settings'] = array(
      'engines' => array(
        db-engine => array(
          'engine' => 'database',
        ),
      ),
      'schemas' => array(
        'db-schema' => array(
          'db-engine',
        )
      ),
      'bins' => array(
        'default' => 'db-schema',
      ),
    );
?>
"default" is for the default caching schema. All valid cache bins (tables)
can be added in addition, but you must have a "default" if you skip any bins.

[From Cache | drupal.org]

But it would not work until I started going through the source, and found that the default had to be :

   $conf['cache_settings'] = array(

   'engines' => array(

   'database-engine' => array(

   'engine' => 'database',

   ),

   ),

   'schemas' => array(

   'database-schema' => array(

   'database-engine',

   )

   ),

   'bins' => array(

   'default' => 'database-schema',

   ),

   );