Databases power all modern applications, from banking and ATM software to space shuttle systems and your Angry Birds game. Wherever you go, you will find databases. The most common databases used today are relational or SQL databases, where data is stored in interconnected tables. In turn, you can query those tables using a query language that resembles plain English, Standard Query Language (SQL). To get the most value of the SQL databases you use as a developer, system administrator, or database administrator, it’s vital that you have visibility into what’s going on. …