REMEMBER that empty_blocks represent the amount of
blocks above the HWM. The only way to know the blocks
below the HWM is with this select:
on 7.X select count(distinct
substr(rowid,15,4)||substr(rowid,1,8)) from
&owner..&table_name.;
on 8.X select count( distinct substr(rowid,1,15)) from
&owner..&table_name.;
This gives you the real space occupy by a segment or
as I said the amount of blocks below the HWM. Then
with the db_block_size you can infer the value in
bytes.
Regards.
--- Vladimir Begun <[EMAIL PROTECTED]>
wrote:
> on Jul 11, 2001 at 11:30:18PM, Chuan Zhang wrote:
> > Hi, DBA gurus,
> >
> > Recently, I will archiving some big tables. How
> to find free space under
> > HWM for a table?
>
> Do analyze and then you can calculate it:
>
> dba_segments.blocks - dba_tables.empty_blocks - 1
>
> Be aware the blocks which are below HWM can be empty
> because of preallocation or delete activities.
>
> --
> Vladimir Begun | echo
> "Congratulations. You aren't running
> http://vbegun.net/ | Eunice."
> http://vbegun.net/wap/ | -- Larry Wall
> in Configure from
> [EMAIL PROTECTED] | the perl
> distribution
> --
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> http://www.orafaq.com
> --
> Author: Vladimir Begun
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>
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Senior DBA
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