in my scenario, it is a read-heavy database with occasionally writes. As average about 3 tags for 500,000 images, it should supports 1.5 million in-memory recor

in my scenario, it is a read-heavy database with occasionally writes. As average about 3 tags for 500,000 images, it should supports 1.5 million in-memory records on one computer. for performance, I expect ~100ms to retrieve 100,000 records.