For those who think google app engine only has one kind of datastore, the one built around â€œbigtableâ€, think again. Nick Johnson goes into details of all the other options available with their proâ€™s and conâ€™s in his post.
App Engine provides more data storage mechanisms than is apparent at first glance. All of them have different tradeoffs, so it’s likely that one – or more – of them will suit your application well. Often, the ideal solution involves a combination, such as the datastore and memcache, or local files and instance memory.
Storage options he lists..
- Instance memory
- Local Files
Read more: Original post from Nick