Android Question Sqlite-Use Memory

If I understand you correctly; You want to delete data.db via a file manager or other means. Don't you have to detach it first?
Please forgive me if I did not understand your question.

Sorry. My English is not good. I'm using google translate.
My problem is not to delete it. (File.Delete(Starter.rp.GetSafeDirDefaultExternal(""),"data.db"))
I'm deleting my physical database. I do not delete the memory.
But after this deletion the query does not work. It gives a disk error.

Error: android.database.sqlite.SQLiteDiskIOException: disk I/O error (code 1802)

attach database doesn't copy the database.

You need to create new tables in the memory database and copy the tables from the attached database. Only then you can delete it.