.. include:: /Includes.rst.txt .. _caching-quickstart: =========================== Quick start for integrators =========================== This section gives some simple instructions for getting started using the caching framework without going into all the details under the hood. .. _caching-quickstart-tuning: Change specific cache options ============================= By default, most Core caches use the :ref:`database backend `. The default cache configuration is defined in :t3src:`core/Configuration/DefaultConfiguration.php` and can be overridden in :file:`config/system/settings.php`. If specific settings should be applied to the configuration, they should be added to :file:`config/system/settings.php`. All settings in :file:`config/system/settings.php` will be merged with :file:`DefaultConfiguration.php`. The easiest way to see the final cache configuration is to use the TYPO3 backend module :guilabel:`System > Configuration > $GLOBALS['TYPO3_CONF_VARS']` (with installed lowlevel system extension). Example for a configuration of a :ref:`Redis cache backend ` on Redis database number 42 instead of the default database backend with compression for the pages cache: .. literalinclude:: _settings.php :language: php :caption: config/system/settings.php | typo3conf/system/settings.php .. _caching-quickstart-garbage: Garbage collection task ======================= Most cache backends do not have an internal system to remove old cache entries that exceeded their lifetime. A cleanup must be triggered externally to find and remove those entries, otherwise caches could grow to arbitrary size. This could lead to a slow website performance, might sum up to significant hard disk or memory usage and could render the server system unusable. It is advised to always enable the :doc:`scheduler ` and run the "Caching framework garbage collection" task to retain clean and small caches. This housekeeping could be done once a day when the system is otherwise mostly idle.