Using different caching backend in TYPO3 6.x After #t3cs2013 I simply wanted to test the ad-hoc performance of using redis as a cache backend. The following lines simply demonstrate-this doesn't mean, it makes sense to use this particular cache backend. The example below uses only the Redis Backend and Namespaces.

AdditionalConfiguration.php

<?php
/**
* We have to increse the database name. You could also have a meaningful name,
* but it has to be unique, so the caches do not interfere.
**/

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_pages']['backend'] = 'TYPO3\\CMS\\Core\\Cache\\Backend\\RedisBackend';
/**
* Options as per http://docs.typo3.org/typo3cms/CoreApiReference/CachingFramework/FrontendsBackends/Index.html#caching-backend-redis
**/
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_pages']['options'] = array(
    'database' => 3,
);

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_runtime']['backend'] = 'TYPO3\\CMS\\Core\\Cache\\Backend\\RedisBackend';
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_runtime']['options'] = array(
    'database' => 4,
);

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cash_hash']['backend'] = 'TYPO3\\CMS\\Core\\Cache\\Backend\\RedisBackend';
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cash_hash']['options'] = array(
    'database' => 5,
);

/**
 * Don't try this at home!
 */
//$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_core']['backend'] = 'TYPO3\\CMS\\Core\\Cache\\Backend\\RedisBackend';
//$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_core']['options'] = array(
//    'database' => 5,
//);

this configuration is suboptimal, as it resets defaultLifetime key which was set in the DefaultConfiguration.php