Drupal "Fatal error: Allowed memory size of 134217728 bytes exhausted when clearing the cache"

Frequently after the change of a server or hoster or during the build-up of a Drupal site you might run into the "Fatal error: Allowed memory size of 134217728 bytes exhausted when clearing the cache". This usually isn't as dramatic as it looks like. The most common cause for this problem is a php memory limit that is too low. Thus the solution is to increase the php memory limit. If you increase the limit to 256M or even 512M you will certainly be without any php memory limit troubles with a standard Drupal installation.

If you run your site on a hosting environment, the quickest solution is to ask your hosting comany to increase the limit. If you can ctronl the serbver yourself, you find different ways to increase the PHP memory limit within the following article: https://drupal.org/node/207036