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.
Change specific cache options¶
By default, most Core caches use the database backend.
The default cache configuration is defined in
EXT:core/Configuration/DefaultConfiguration.php and can be overridden in
If specific settings should be applied to the configuration, they should be
config/system/settings.php. All settings in
config/system/settings.php will be merged with
DefaultConfiguration.php. The easiest way to see the final cache
configuration is to use the TYPO3 backend module
System > Configuration > $GLOBALS['TYPO3_CONF_VARS']
(with installed lowlevel system extension).
Example for a configuration of a Redis cache backend on Redis database number 42 instead of the default database backend with compression for the pages cache:
<?php use TYPO3\CMS\Core\Cache\Backend\RedisBackend; return [ // ... 'SYS' => [ // ... 'caching' => [ // ... 'pages' => [ 'backend' => RedisBackend::class, 'options' => [ 'database' => 42, ], ], ], ], ];
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 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.