Database: Redis

install the redis extension phpredis

configuration in configs.php

return [
    'components' => [
        'redis' => [
            'product' => [
                'host'     => 'localhost',
                'pconnect' => true,
            ],
            'default' => [
                'host'     => 'localhost',
                'pconnect' => true,
            ],
        ],
        // ...
    ],
    // ...
];

$app->get('/product/:id', function($id) {
    $this->redis->product->incr('view:'.$id);
});

$app->get('/', function(){
    $this->redis->counter->incr(); // same as $this->redis->default->incr('cunter');
});

$this->redis->foo->bar = 'val'; // same as $this->redis->hset('foo', 'bar', 'val');

$this->redis->foo->hget('bar'); // same as $this->redis->hget('foo', 'bar');