We are running the latest available version of Moodle (maintained by git) on Ubuntu 12.04 and php 5.4.9. Due to performance troubles I tried make use of the caching system by installing memcached. Once installed I created a memcached cache store instance within the Moodle administration interface and added "Configuration Setting" (6th point) for caching. Since that time I cannot open this administration interface because PhP/Apache crashes and I only can find the segfault error message in the error file of Apache's log system (" child pid 2818 exit signal Segmentation fault (11)") .
How can I disable this point within Mysql because the GUI-interface is no longer useful. However I want to use the caching system - but it should work. Perhaps somebody has an idea how to solve this unpleasant "caching feature"?