This script will give you an overview of RMAN database backups including DB size, backup size and backup level. I use the SQL statement in an Enterprise Manager report. I use the script to monitor the backup process. The script provides this information: incremental backup type, the total size of the datafiles, the backed up size, and the ratio. The backup type is especially useful to monitor the backup strategy and the backup size and ratio is useful to calculate the need for backup storage (tapes). I have tested this on Oracle 8.0,8.1, 9.0 and 9.2.
select to_char(completion_time,'YYYYMMDD') "Backup Date", max(incremental_level) "Level", sum(round(DATAFILE_BLOCKS * BLOCK_SIZE / 1048576)) "Total DB Size (MB)", sum(round(BLOCKS * BLOCK_SIZE / 1048576)) "Backup (MB)", round(sum(BLOCKS) / sum(DATAFILE_BLOCKS) * 100 ) "Ratio" from v$backup_datafile group by to_char(completion_time,'YYYYMMDD';)I often used the scripts in conjunction with the one below, which gives the same information for redologs.
select to_char(p.completion_time,'YYYYMMDD') "Backup date", sum(round(b.BLOCKS * b.BLOCK_SIZE / 1048576)) "REDO Backup (MB)" from v$backup_redolog b, v$backup_piece p where b.set_count=p.set_count AND b.set_stamp=p.set_stamp group by to_char(p.completion_time,'YYYYMMDD');
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