Suppose you have news website and you want to show last 20 news on the homepage.
Some log files works in same way.
Using MySQL this can be done with "select - order by - limit" query. If there are lots of news, the table will eighter grow or will became fragmented. In both cases site will slow down dramaticly.
Here is how this may be done with Redis.
$r = new Redis(); $r->connect("127.0.0.1", "6379"); $newsroom = "sport"; $newsitem = "Barcelona vs Sporting Lissabon 2:1"; // Create a hash key $key = "news:" . $newsroom; // Push into the list... $r->lpush($key, $newsitem); // Trim the list, so it can contain up to 20 items... $r->ltrim($key, 0, 20 - 1);
Redis connection note
The example uses generic connection to the Redis server. To make the example work with our service you will need to use code similar to this one:
// change these parameter according to the information in your instance list $host = '184.108.40.206'; $port = 1234; $password = 'somehashcode'; $db = 0; $r = new Redis(); $r->connect($host, $port); $r->auth($password); $r->select($db);
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Because we want this page to be useful for memcached users, we tagged with memcached all examples that may be "recreated" for memcached server.
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