Unable to perform the backup because the database is closed

OK....I have painstakingly been going through this over and over; I have no idea why Oracle makes this so dfifficult.  I have a windows account with administrator privledges...all i sgood there.  I connect through the Enterprise Manager (same as RMAN really according to the script) using SYSTEM account.  OK...all is good there but then when the job is executing, I am getting this error:

Unable to perform the backup because the database is closed

Really need to resolve this...thx
Glen_DAsked:
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mrjoltcolaCommented:
Is the database open?

What happens if you try?

sqlplus / as sysdba

SQL> alter database open;
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Glen_DAuthor Commented:
I receive an error stating that "a database already opened by the instance"

Thx
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schwertnerCommented:
This happens often when the DB is not registered.
Backup LISTENER.ORA file!!!!!!!

In ...\network\admin open listener.ora

see

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = D:\Ora10g)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (SID_NAME = test)
      (ORACLE_HOME = D:\Ora10g)
    )
  )

Add the entry
    (SID_DESC =
      (SID_NAME = test)
      (ORACLE_HOME = D:\Ora10g)
    )
with regard to the particular Oracle Home and SID Name.


In Oracle 11g you have to create from scratch in the listener.ora file the section

SID_LIST_LISTENER =
&..

mentioned above.

Restart the listener:
c:>lsnrctl stop
c:>lsnctl start

Only after that we can go further,
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schwertnerCommented:
Alternativelly you have to ensure correct ORACLE_SID and other parameters.
Possibly there are other instances on your computer that do not run
and RMAN get loosed.

I will recommend do not use OEM for backups although the new trend of Oracle is to advise to use it.
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Glen_DAuthor Commented:
I used the SYS account instead of SYSTEM and logged in as SYSDBA.  Ran one immidiate backup and then set a job for daily backups.

Should be good...thx
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schwertnerCommented:
Good luck!
Please - use only SYS account working with OEM and doing
administrative tasks. Other accounts do not have the needed privileges and the worst thing is that it is hard task to figure out which privileges have to
be assigned to do a particular job.
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