The cloud database market continues to solidify as Google puts a price tag on its Cloud SQL offering. With actual charges to begin on June 12, the move finally gives developers a way to see what they'll be spending on Cloud SQL, but comparing Google's offering to Amazon, Microsoft and others might still be a bit tricky. Google's Cloud SQL is MySQL-based and is intended to be used with Google App Engine (GAE). Google's pricing structure is very simple, though not as comprehensive or as expandable as Amazon or others. Google has two billing plans: a package plan and a per-use plan. The package plan has four tiers, each of which includes a set amount of RAM, storage and I/O per day. For instance, Google charges $1.46 per day for the D1 tier, which has .5GB of RAM, 1GB of storage and 850,000 I/O requests.