Flávio Costa wrote:

> By using gfix, can I bring database to single user mode and attatch only
> once at a time?
>
>

You have distinct modes:

one wich allows everyone to connect
the other that allows only sysdba to connect (even more than one connection)
and another one that permits only a single connection from sysdba

see you !

--
Alexandre Benson Smith
Development
THOR Software e Comercial Ltda
Santo Andre - Sao Paulo - Brazil
www.thorsoftware.com.br