Memcached is a high-performance, distributed memory object caching system. It is used in a wide range of sites such as livejournal.com and facebook.com as a way to alleviate database load helping to speed up sites. Memcached is usually deployed as an adequate subset of servers in relation to your application and database infrastructure. It’s a great way to cut down your database calls by caching the requests.
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I find the Apache mod_status module to be very helpful in respect to Apache server performance/usage monitoring and debugging. However I have read books and posts stating a performance hit when the module is enabled particularly with “ExtendedStatus On”, so what’s the real deal? I never hear what the impact is, in a real world setting.
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