On Jul 12, 2001 at 12:10:25AM, Vladimir Begun 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.
A way to calculate number of really used blocks (for 8+):
SELECT COUNT(DISTINCT
DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid)
|| DBMS_ROWID.ROWID_RELATIVE_FNO(rowid)
)
FROM schema.table;
SELECT COUNT(DISTINCT SUBSTR(rowid, 1, 15)) FROM schema.table;
--
Vladimir Begun | I expect people to expect Perl to do the
http://vbegun.net/ | right thing.
http://vbegun.net/wap/ | -- Larry Wall in
[EMAIL PROTECTED] | <[EMAIL PROTECTED]>
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Author: Vladimir Begun
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