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I am up to here in drupal documentation :

Start at least one instance of memcached on your server. Edit settings.php to make memcache the default cache class, for example: $conf['cache_backends'][] = 'sites/all/modules/contrib/memcache/memcache.inc'; $conf['cache_default_class'] = 'MemCacheDrupal'; $conf['memcache_key_prefix'] = 'something_unique';

Why do I need a memcache key prefix if have only one database? Anyway where and how do I set it?

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2 Answers 2

Reset to default
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All those settings are added to settings.php

usually sites/default/settings.php

$conf['cache_backends'][] = 'sites/all/modules/contrib/memcache/memcache.inc'; $conf['cache_default_class'] = 'MemCacheDrupal'; $conf['memcache_key_prefix'] = 'k1'; // Use database for cache_form $conf['cache_class_cache_form'] = 'DrupalDatabaseCache';

You only need a memcache key prefix if you're using memcache with more than one site on that server. Adding a short key, e.g $conf['memcache_key_prefix'] = 'k1'; is good practice.

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  • Thank you. I didn't use a prefix and also used the following which has it up and running:include_once('./includes/cache.inc'); include_once('./sites/all/modules/memcache/memcache.inc'); $conf['cache_default_class'] = 'MemCacheDrupal'; Commented Jan 14, 2013 at 10:28
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    If you have a larger site and don't want AJAX or form cache functionality to break, add this as well: $conf['cache_class_cache_form'] = 'DrupalDatabaseCache'; Commented Dec 4, 2014 at 17:36
  • @StevenLinn, thanks, cache_form exclusion rule added for completeness. Commented Jan 23, 2015 at 9:48
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Solution for Drupal 8: (also in settings.php)

$settings['memcache']['key_prefix'] = 'something_unique';

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