ITPub博客

select (UR*(UPS*DBS))+(DBS*24) as "bytes" from (select values as UR from v$parameter where name='undo_retention'),(select (sum(undoblks)/sum(((end_time-begin_time)*86400))) as ups from v$undostat),(select values as DBS from v$parameter where name='db_block_size');[@more@]