Re: How to set the WHOLE Database in backup mode

If you do not want to shutdown your dtabase (and lose the SGA and other interesting bits). The following PL*SQL can accomplish this for you. Please note that :
1. Hot backups require that archive log mode is on 2. Temp tablespaces based on temp files cannot be backed up.

The following PL*SQL code will place the Oracle database into backup mode. It selects all of the tablespaces and uses the Oracle 8i ³EXECUTE IMMEDIATE² command. This is just a sample of the code and it requires more extensive error checking. This can be handled by adding an exception handler to this code.

Errors will occur if the database is not in archive log mode. This code must be run as an Oracle user with the privileges for backup (dba or sysoper).

The database can be taken out of backup mode by replacing the beg_end value with the word END and remove the log switch command.

declare
  cmd VARCHAR2(1000) ;
  beg_end VARCHAR2(6) := 'BEGIN' ;
begin
  dbms_output.enable(1000000) ;
  cmd := 'Begin @' || TO_CHAR(SYSDATE,'hh24:mi:ss');   dbms_output.put_line(cmd) ;
  cmd := 'ALTER SYSTEM SWITCH LOGFILE ' ;   EXECUTE IMMEDIATE cmd ;
  dbms_output.put_line(cmd) ;
  FOR ts_rec IN (SELECT tablespace_name FROM dba_tablespaces) LOOP     cmd := 'ALTER TABLESPACE ' || LOWER(ts_rec.tablespace_name)

        || ' ' || beg_end || ' BACKUP ' ;     EXECUTE IMMEDIATE cmd ;
    dbms_output.put_line(cmd) ;
  END LOOP ;
  cmd := 'End @' || TO_CHAR(SYSDATE,'hh24:mi:ss') ;   dbms_output.put_line(cmd) ;
end ;

HTH
   James

In article <1ac7c7b3.0304221633.67ee444e_at_posting.google.com>, Paul Drake <drak0nian_at_yahoo.com> wrote:

> Rick Denoire <100.17706_at_germanynet.de> wrote in message
> news:<frg8avcq7pigvia1qt6jpni7mcm9skvnff_at_4ax.com>...
> > Well we know the command "alter tablespace <tralala> begin backup",
> > but if there are a dozen of tablespaces, and one has to make a hot
> > Snapshot of the DB files, then I wonder if having to use this command
> > a dozen of times (for each tablespace separately) will garantee that
> > all tablespaces are in sync when the last of them is set in backup
> > mode.
> >
> > So is there any other command to set the DB as a whole in the backup
> > mode?
> >
> > Thanks
> > Rick Denoire
>
> sure -
> sqlplus /nolog
>
> alter system checkpoint;
> alter system archive log current;
> shutdown abort
> startup restrict
> shutdown immediate
>
> <run your cold backup job>
>
> startup
> quit
>
> you now have a consistent backup set - and you didn't even have to put
> any tablespaces in backup mode - and it won't require any recovery.
>
> if that it not what you wanted, then you must change what you want.
> "hot" or "consistent" are mutually exclusive concepts.
>
> Pd
Received on Wed Apr 23 2003 - 08:49:58 CDT