Install Apache Bench – Ubuntu 14.04

AB is a tool for benchmarking Apache Hypertext Transfer Protocol (HTTP) server. It is designed to give an impression of how current Apache installation performs. More specifically it shows how many requests per second Apache installation is capable of serving.
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SQL: hierarchical recursive query

This post is merely a self reminder. Using hierarchical data in a SQL database is very common. It’s complexity clearly points that the management of hierarchical data is not what a relational database is intended for. The tables of a relational database are not hierarchical, but are simply a flat list. But practical usage of parent-child relationship data structure is quite useful.
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