amount of unused block compression per TS?

  • From: Martin Berger <martin.a.berger@xxxxxxxxx>
  • To: Oracle-L Freelists <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 18 Jun 2009 08:01:52 +0200

Hi List,
Does anyone knows a method how to get the amount of unused blocks [1]
per TableSpace?
I try to compare the amount of data RMAN will backup in an incremental
or full backup.
I know how to use block change tracking [2] to count the changed
blocks since the last full backup using X$KRCBIT as described by Alex
Gorbachev in [3].
But until now I did not find any way to provide me the number of never
used blocks of a TS.
can anyone gives me a hint?
thank you all in advance,
 Martin

[1] http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/glossary.htm#i432341
[2] http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/glossary.htm#insertedID33
[3] http://www.pythian.com/documents/UKOUG06-10gBCT.ppt
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