Summery of all Used Oracle-Blocks

Hello!

I am backing up with Oracle8/rman80.
Rman only backups used Oracle-Blocks.

But the statement i used for to control the backupsetsize gives the allocated segments not the used OracleBlocks, they could be less.

SELECT
  SUM(bytes) / ( 1024 * 1024 ) netto_database_size_m FROM
  dba_segments;

Do you know a statement for the exact number of used Oracle-Blocks? Thank you!

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