once the application terminates, I write data on the database.
As from the new ios 4 applicationWillTerminate: is not known as, I have place the same saving code in applicationDidEnterBackground: and applicationWillTerminate:
I just read the task carried out in applicationDidEnterBackground: needs to have a couple of time.
So, when the writing around the db takes more, how could I manage this?
You receive 5 seconds to do any saving etc within the applicationDidEnterBackground: method.
If you want a lot more than 5 seconds there's this UIApplication approach to request experience thread that will permit additional time to complete anything you need:
Here's Apple's example code with this: