> We discussed this project in ou rcompany, and there are some questions about
> this:
>
> - Is it true or false, that only SYSDBA can do a database shutdown, or it
> can be done by the database owner, or anybody can shutdown a database?

You can test such simple problem yourself :-)
Both SYSDBA and database-owner can do shutdown. Nobody else.

> - While the database is in shutdown state, only one connection can be done,
> or at least only one user can have access to that database?

"Unlimited" number of connections, but again - only SYSDBA and database-owner
can connect. (This one is easy to test too :-)

Ivan