Brian Leung <c50342182003@yahoo.com.hk> wrote in
news:d4dl9q$dd0$1@news.hgc.com.hk:

> Hi,
> If I use "alter database backup controlfile to trace", suppose I lose
> all control files. How can I recover from the trace file?
> Thank you
>

By invoking the edited trace file from SQL*Plus.
I suggest that you at least look at the contents of the file;
it might give you a clue or two.