Re-org tablespace with BOLBS.

Hi,
I want to do reorg of tablespace wich has tables with BLOBS in it. It is a 9i database and the size of this tablespace is around 1000 GB. The records are being extracted out of this table and at present the internal space used by lobs as queried by dbms_lob.getlength is 250 GB.
I know that it has to be done only by exp/imp and it is going to take a long time.
1.What should be the optimum internal space used(which is 250 g, now) at which I should think of starting the reorg. This cannot come below 150 g.
2.How long will the reorg take.
3.Is there any method or base line which will indicate me the approximate time required.
Any experience, input at this forum will greatly help me.
Thanks
KH

Do you really have a single 1TB tablespace?Yes
Respect!! Out of interest, how many datafiles isThe number of datafiles are
COUNT(FILE_NAME)
524
s that? On what OS?the OS is
SunOS srvrname 5.9 Generic_118558-06 sun4u sparc SUNW,Sun-Fire-V490
Incidentally, why are you having to reorganise this
tablespace? I think I can guess but I'd like to know
for sure.
This tablespace has grown to 1000 + Gig. When it was designed there
was no plan to purge/delete older records. Now the purge job is going
on to control the size of the database. And records are being
extracted and stored in an archival database. Thus the internal space
used by the lobs in that tablespace(I queried with dbms_lob.getlength)
has reduced to 250 Gig. But you know the tablespace is still holding
the 1000+ Gigs space and I know re-org is the only way to release space of this tablespace.
The option I am left with is the export and then import which will
for sure going to take weeks but may be month. As one of my
colleague's experience is that for a 10 Gig re-org it took 72 hours,
and other senior management is also of the same opinion.
Is there any relation to calculate how long will this take.
Thanks APC
KH

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