oracle 10g允许对备份集进行压缩，直接备份到磁带不能直接压缩。
RUN {
ALLOCATE CHANNEL ch0 TYPE disk maxpiecesize 10G ;
BACKUP as compressed backupset DATABASE FORMAT='E:\BACKUP\%U' ;
BACKUP CURRENT CONTROLFILE;
SQL 'alter system switch logfile';
# backup archivelog time between 'sysdate-3' and 'sysdate';
RELEASE CHANNEL ch0;
}
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