I have a simple table inherance, with an upper class GeneralElement. A
class that inherits is Activity:
class Activity < GeneralElement
The GeneralElement table is very big (about 2.000.000 rows!). Other
classes that inherit from GeneralElement return queries very fast, but
Activity.last is very slow. I have added indexes to id and type, but it
has no effect. What can I do?
I'll appreciate any help