I've always renamed a datafile by putting the
tablespace offline. I do not have the luxury to stop
the instance. I do that kind of things at 4 AM when
there is less activity on the system.
In which case do I need to do a recovery on a datafile
?
- Trassens Christian <trassenc_at_TELEFONICA.COM.AR> a
écrit : > Doug,
>
> An aclaration: you can only put a tablespace or a
> datafile offline if the
> database is in ARCHIVELOG mode. You can issue an
> offline drop when the
> database is in NOARCHIVELOG mode. However I do not
> recomend it because of
> the risk of losing the information from the redo.
>
> After you put a tablespace/datafile offline, Oracle
> ALWAYS requires that you
> do media recovery on that datafile: recover datafile
> 'xxx'; ( you can issue
> a recover tablespace when the database is open ).
> Then you can put it
> online.
>
> Another thing that comes to my mind. If you want to
> rename a datafile in a
> ARCHIVELOG mode database and you choose to put the
> datafile offline, you
> have to do it with the NORMAL and not IMMEDIATE.
> Because with an OFFLINE
> NORMAL Oracle issues a checkpoint.
>
> And as Gaja said you can not put the tablespace
> SYSTEM offline.
>
> Regards.
>
> > -----Mensaje original-----
> > De: Gaja Krishna Vaidyanatha
> [SMTP:gajav_at_yahoo.com]
> > Enviado el: Jueves 6 de Julio de 2000 14:28
> > Para: Multiple recipients of list ORACLE-L
> > Asunto: Re:RE: Moving datafiles
> >
> > Doug,
> >
> > Your comment about offlining the tablespace and
> the effect of
> > that in running into the "datafile needs recovery"
> message is a
> > valid one. But if the database is in ARCHIVELOG
> mode, it is
> > easy enough to issue a "recover tablespace xxx"
> before the
> > tablespace is brought online.
> >
> > The message about one or more datafiles needing
> recovery in an
> > "offlined" tablespace is indicative of probably a
> checkpoint
> > and/or a log switch that has occured in the
> interval between the
> > tablespace being "offlined", datafile(s) being
> relocated and the
> > tablespace being "onlined". There are absolutely
> no issues with
> > issuing a "recover tablespace xxx" at that stage
> and it just
> > ends up synching up the header(s) of the
> datafile(s).
> >
> > I do agree with your methodology in you are
> running in
> > NOARCHIVELOG mode, when one runs the potential
> risk of n log
> > switches occuring during the operation, where n is
> the number of
> > redo log groups in the database. Of course the
> SYSTEM and
> > ROLLBACK tablespaces can be relocated only by the
> method that
> > you outlined.
> >
> > If we are talking about a normal production
> database, it may not
> > be too ambitious to assume that a "shutdown" is
> not feasible.
> > In that case "offlining", copying the datafile(s)
> and "onlining"
> > the tablepace will be the only option. Just
> wanted to share
> > some thoughts....
> >
> > Best Regards,
> >
> > Gaja.
> >
> > --- dgoulet_at_vicr.com wrote:
> > > Call me paranoid if you like, but my desired
> course of action
> > > on this has always
> > > been:
> > >
> > > 1) shutdown the database (either normal or
> immediate, but NOT
> > > abort)
> > > 2) cp /old_dir/old_file_name to
> /new_dir/new_file_name
> > > 3) startup mount the database
> > > 4) alter system rename file
> '/old_dir/old_file_name' to
> > > '/new_dir/new_file_name';
> > > 5) alter database open If the db opens at this
> point matters
> > > should be well.
> > >
> > > 6) check date/time stamps on both the old file
> and the new
> > > file. The new file
> > > date/time stamp should be just a minute or so
> ago while the
> > > old file date/time
> > > stamp should be earlier. If so, delete the old
> file.
> > >
> > > Why one would ask?? I've trashed a couple of
> db's by not
> > > following these rules
> > > in the past. If you try to do this by offlining
> the
> > > tablespace you can run into
> > > the "datafile needs recovery" message. Also a
> mv is a one way
> > > thing. If you
> > > happen to mv from a good disk drive to a bad one
> there is NO
> > > fall back. (Been
> > > there, done that, and it still smarts!!!)
> > >
> > > Dick Goulet
> > >
> > > ____________________Reply
> Separator____________________
> > > Author: Trassens Christian
> <trassenc_at_TELEFONICA.COM.AR>
> > > Date: 7/6/00 5:27 AM
> > >
> > > Yes. However or the database is down or you put
> the tablespace
> > > offline
> > > first.
> > >
> > > Regards.
> > >
> > > > -----Mensaje original-----
> > > > De: Solis Llera, Eduardo
> [SMTP:esolis_at_mapfre.com]
> > > > Enviado el: Jueves 6 de Julio de 2000 07:54
> > > > Para: Multiple recipients of list ORACLE-L
> > > > Asunto: RE: Moving datafiles
> > > >
> > > > yes that is correct.
> > > >
> > > > > -----Mensaje original-----
> > > > > De: Weerd de E.C. Kirsten
> > > [SMTP:Kirsten.deWeerd_at_oranjewoud.nl]
> > > > > Enviado el: jueves 6 de julio de 2000 11:44
> > > > > Para: Multiple recipients of list
> ORACLE-L
> > > > > Asunto: Moving datafiles
> > > > >
> > > > > Hi all,
> > > > >
> > > > > The simplest things sometimes keep
> confusing me, so
> > > I'll just ask
> > > > > and see if someone agress or not :-)
> > > > >
> > > > > I need to move some datafiles around on
> Hp-UX 10.20
> > > > >
> > > > > I figure I can do this in two steps :
> > > > >
> > > > > 1. on the OS : mv original_dir\datafile.dbf
> > > new_dir\datafile.dbf
> > > > >
> > > > > 2. in the DB : alter database rename file
> > > original_dir\datafile.dbf to
> > > > > new_dir\datafile.dbf
> > > > >
> > > > > Correct ???
> > > > >
> > > > > Greets,
> > > > >
> > > > > Kirsten
> > > > > Living near Antwerp, Belgium
> > > > > Working near Breda, Netherlands
> > > > >
> > > > > --
> > > > > Author: Weerd de E.C. Kirsten
> > > > > INET: Kirsten.deWeerd_at_Oranjewoud.nl
> > > > >
> > > > > Fat City Network Services -- (858)
> 538-5051 FAX: (858)
> > > 538-5051
> > > > > San Diego, California -- Public
> Internet access /
>
=== message truncated ===
Stephane Paquette
DBA Oracle
stephane_paquette_at_yahoo.com
Received on Fri Jul 07 2000 - 01:43:14 CDT
