Yes and no :-)
Yes - it uses a bitmap rather than hacking about with
FET$ and UET$
No - it does not solve extent fragmentation fully
since it does not limit the extent sizes in use in the
existing tablespace. Basically it finds the greatest
common divisor of all the existing extents in the
tspace and uses that as the 'granularity' for extents.
You could end up with a something as low as a single
block
Bottom line - if you're suffering on FET$ and UET$
then do it. If not, then it would be preferable to
create new "proper" lmt tablespaces, move the data to
them and drop the old ones...lots of work though
hth
connor
hth
connor
- John Dunn <john.dunn_at_sefas.co.uk> wrote: > Not
sure that I fully understand that.
>
> Does that mean that tablespace_migrate_to_local does
> not actually give me
> any of the advantages of locally managed tablespaces
> in terms of extent
> management?
>
> John
>
>
>
> > -----Original Message-----
> > From: Mark Leith [SMTP:mark_at_cool-tools.co.uk]
> > Sent: 03 July 2002 16:18
> > To: Multiple recipients of list ORACLE-L
> > Subject: RE:
> dbms_space_admin.tablespace_migrate_to_local
> >
> > John,
> >
> > No you can't. Here is an excerpt from one of
> Jonathan Lewis' articles on
> > his
> > web site:
> >
> > "The final consequence of converting a dictionary
> tablespace to a locally
> > managed tablespace is that xxx_tablespaces will
> show the extent_mangement
> > to
> > be "LOCAL", but the allocation_type to be "USER".
> Clearly, the examples
> > above show that Oracle will in general be unable
> to use autoallocate on
> > the
> > tablespace, and if it switched to uniform the
> consequences of having a
> > unit
> > size of one block could be disastrous. After
> conversion, extents will be
> > allocated according to the normal next_extent
> methods, with the proviso
> > that
> > rounding to the unit size will occur."
> >
> > Taken from:
> >
> > http://www.jlcomp.demon.co.uk/ch_08.html
> >
> > And page that explains getting a "uniform" extent
> size (scroll to the
> > bottom
> > of the page):
> >
> > http://p2p.wrox.com/archive/oracle/2001-04/0.asp
> >
> > HTH
> >
> > Mark
> >
> >
> ===================================================
> > Mark Leith | T: +44 (0)1905 330 281
> > Sales & Marketing | F: +44 (0)870 127 5283
> > Cool Tools UK Ltd | E: mark_at_cool-tools.co.uk
> >
> ===================================================
> > http://www.cool-tools.co.uk
> > Maximising throughput & performance
> >
> >
> > -----Original Message-----
> > Sent: 03 July 2002 12:43
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Can this be used to specify the allocation,
> autoallocate or uniform?
> >
> > John
> >
> >
> > --
> > Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> > --
> > Author: John Dunn
> > INET: john.dunn_at_sefas.co.uk
> >
> > Fat City Network Services -- (858) 538-5051
> FAX: (858) 538-5051
> > San Diego, California -- Public Internet
> access / Mailing Lists
> >
>
> > To REMOVE yourself from this mailing list, send an
> E-Mail message
> > to: ListGuru_at_fatcity.com (note EXACT spelling of
> 'ListGuru') and in
> > the message BODY, include a line containing: UNSUB
> ORACLE-L
> > (or the name of mailing list you want to be
> removed from). You may
> > also send the HELP command for other information
> (like subscribing).
> >
> > --
> > Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> > --
> > Author: Mark Leith
> > INET: mark_at_cool-tools.co.uk
> >
> > Fat City Network Services -- (858) 538-5051
> FAX: (858) 538-5051
> > San Diego, California -- Public Internet
> access / Mailing Lists
> >
>
> > To REMOVE yourself from this mailing list, send an
> E-Mail message
> > to: ListGuru_at_fatcity.com (note EXACT spelling of
> 'ListGuru') and in
> > the message BODY, include a line containing: UNSUB
> ORACLE-L
> > (or the name of mailing list you want to be
> removed from). You may
> > also send the HELP command for other information
> (like subscribing).
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author: John Dunn
> INET: john.dunn_at_sefas.co.uk
>
> Fat City Network Services -- (858) 538-5051 FAX:
> (858) 538-5051
> San Diego, California -- Public Internet
> access / Mailing Lists
>
> To REMOVE yourself from this mailing list, send an
> E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of
> 'ListGuru') and in
> the message BODY, include a line containing: UNSUB
> ORACLE-L
> (or the name of mailing list you want to be removed
> from). You may
> also send the HELP command for other information
> (like subscribing).
Connor McDonald
http://www.oracledba.co.uk
http://www.oaktable.net
"Remember amateurs built the ark - Professionals built the Titanic"
Do You Yahoo!?
Everything you'll ever need on one web page
from News and Sport to Email and Music Charts
http://uk.my.yahoo.com
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: =?iso-8859-1?q?Connor=20McDonald?=
INET: hamcdc_at_yahoo.co.uk
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
Received on Wed Jul 03 2002 - 12:18:31 CDT
