SHARE When Oracle Corp. acquired Sun Microsystems for $7.5 billion in 2009, there was some concern expressed in the tech community that the company would view Sun’s open-source database – MySQL – as a troublesome competitor, destined for oblivion. Instead, Oracle has taken the MySQL car into the garage, added a new engine, fine-tuned the steering, and rolled out an in-memory database query accelerator, which the company claims is faster than anything else on the cloud market today. The new service, which Oracle introduced last year under the name HeatWave, offers an intriguing new spin on a technology that made its first appearance over 25 years ago.