“You might be interested in red toilet paper, because you bought blue and green toilet paper, and people who also bought blue and green toilet paper tend to also buy red toilet paper”. Recommendation engines are now everywhere, from e-commerce to social networks. Graphs databases like Neo4j are probably the best way to tackle the problem. But as an alternative, let’s try building a recommendation
DNS records and TTL - how long does a second actually last? In a DNS zone, every record carries its own time-to-live, so that it can be cached, yet still changed if necessary. This information is originally served by authoritative servers for the related zone. The TTL is represented as an integer number of seconds. At first sight, the mechanism looks straightforward: if the www.example.com record
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