[[\yii\caching\ApcCache]]: uses PHP APC extension. This option can be considered as the fastest one when dealing with cache for a centralized thick application (e.g. one server, no dedicated load balancers, etc.).

[[\yii\caching\DbCache]]: uses a database table to store cached data. By default, it will create and use a SQLite3 database under the runtime directory. You can explicitly specify a database for it to use by setting its db property.