Question : For backups using RMAN, setting NLS_LANG, NLS_DATE and parameter BACKUP_TAPE_IO_SLAVES

We are using SAP 4.6 C application, Oracle 8.1.7.3 database, and AIX 4.3 Operating System. I am taking the backups using RMAN (Recovery Manager, which is a Oracle tool) in cooperation with TSM (Tivoli Storage Manager).
In the RMAN messages log file after the completion of the Oracle database backups using RMAN, it is showing the backup set creation_time=26-FEB-03, it is showing only the date but not the time at which the backup has been taken place. Waht I have to do if I wants to get the backup time also to be recorded in the log file instead of only the backup date? I wants both the backup time and date to be recorded in the RMAN log file, for this what should I do? I have seen in Oracle manual to set the fololowing NLS environment variables before invoking RMAN.
The environment variables are : NLS_LANG=american,
NLS_DATE_FORMAT='Mon DD YYYY HH24:MI:SS'.
I don't know how to set these environment variable, pls guide me how to do these settings. And, it is saying that these variables has to be set before invoking RMAN, what does it means? Before taking the backups I have to set these variables or someother meaning? I have already invoked RMAN and daily taking the backups, now how should I set these variables so that I can get both the date and time in the backup log files.
And another issue is, when taking the backups to 3 different tapes at the same time, the init parameter BACKUP_TAPE_IO_SLAVES=TRUE has to be there in init.ora parameter file, this is what the Oracle manual is saying. Only this is the parameter I have to change to take the duplex backup sets or I have to add or change any other parameters or settings? I have to increase the number of backup channels also or not?
Pls guide me in the above issues.
Thank you.

Answer : For backups using RMAN, setting NLS_LANG, NLS_DATE and parameter BACKUP_TAPE_IO_SLAVES

Dear friend,

It is very simple to set this variable at when you start with RMAN.

ALTER SESSION SET NLS_DATE_FORMAT='Mon DD YYYY HH24:MI:SS'

or

ALTER SYSTEM SET NLS_DATE_FORMAT='Mon DD YYYY HH24:MI:SS'

I think after you set this parameter in your SQLplus you can work easily.

Thanks,
Gitesh Trivedi.