Oracle Database Discussions

I have a big database running on oracle 11g release 2 with a lot of users and huge of transactions per day running in the archivelog mode, I'm going to change the mode of the database to no archive log mode

using the following steps :-

SQL> shutdown immediate

SQL> startup mount

SQL> alter database noarchivelog;

SQL> alter database open;


is there any risk to do that

may the database after altered to noarchivelog mode, couldn't be opend?

what are the Reserves to be taken before conducting this work ?


thanks a lot.