Redis Is Memcached On Steroids. Imagine You Created A Super Cool Unique… 7591978

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With social media sites such as Twitter the sharing of links is problematic at best because of the 140 character limit imposed on message length. This problem has given rise to the proliferation of URL Shortening Services and whilst these services do a fantastic job on the whole there are risks involved with trusting a third party to redirect your links. There are over 100 URL shortening services online, the majority of which are free. A more complete list of these services can be found on my website. What is the link destination? There is usually no way of knowing your final destination until you click the link. The true target is obscured. Admittedly this risk applies to all link cloaking technologies but usually when you receive a dubious link via email for example, you can either view the plain text version of the link or hover your mouse over the URL to see the destination address and assess its validity. With all shortened URLs this first line of defence has been removed, you don't know where clicking the link will take you.
One tiny example of how this simplifies things is incrementing a counter, for example if you wanted to know how many redirects resulted from a specific encoded URL. Memcached would store the count as a string representing an integer, get this value, and then set a new string to represent a larger integer. With Redis, you would simply increment the integer atomically. Similar to other key value databases, Redis trades off limited in-memory storage capacity in exchange for a faster look up speed. However, for disaster recovery, Redis persists to disk for backup. RDB files are a compressed, binary representation of the in-memory store to preserve a point-in-time snapshot of your dataset at specified intervals by initiating a fork() of a child process, useful for disaster recovery. RDB persistence is enabled by default. AOF (append-only-files) maintains a text log of write operations used to reconstruct the original dataset, for example upon server restart. AOF and RDB persistence can be enabled at the same time, or persistence completely disabled. In most every scenario, Redis has evolved to be as good as, if not better, than Memcached. However, both Redis and Memcached have the ability to dramatically increase performance with relatively minimal work to implement.
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Fortunately, all it takes to find one of these places is research. Most of the URL shorteners that pass the link credit on are very vocal about the fact that they pass the credit on to the website. This means that if a link credit can be passed on then it will be passed on to its rightful owner. Therefore, the content owner does not need to worry about doing business with of those types of URL shortener services. In closing, a business owner must make sure to use the right URL shortener and not allow the default shortener to dictate where the link credit will go. This also assures the business owner that they will know where the link credit will go in the present and in future. Therefore, a business owner should do their homework and figure out what service to use as soon as possible to limit the loss of off page SEO. The sooner a person can do this one simple thing, the better off they will be in the end.


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