Re: Partitions of table read only

Rachel,

A TS can't become read only if there are active transactions against it. You must wait till they all finish or kill them.

A word of advice - if you decide to kill the sessions, bring the tablespace offline and then online to flush the buffers to disk. This will ensure that the delayed block cleanout will not occur and the contents will never be searched in an undo segment. This is not absolutely necessary, nor is docuemnted anywhere, but in an active system I have seen ORA-1555 problems surfacing.

HTH. Arup

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Wednesday, June 18, 2003 1:29 PM

> okay, am I missing something?
>
> I created an LMT. Created a table in it. Gave no one quota on the
> tablespace.
>
> did (both as system and sysdba)
>
> alter tablespace test_drop read only;
>
>
> and hung
>
>
> what did I forget to do?
>
>
>
> --- Rachel Carmichael <[EMAIL PROTECTED]> wrote:
> > that actually makes sense when you think about it, with one question
> > --
> > was the tablespace a dictionary-managed one or an LMT?
> >
> > If it was dictionary-managed, it makes perfect sense. The metadata
> > about the table and the extents used in the tablespace are not stored
> > IN that tablespace, so drop table would affect only the system
> > tablespace and the data dictionary.
> >
> > But in an LMT, the bitmap of extent usage is stored within the
> > tablespace itself, so I wonder if you could actually drop a table
> > from
> > a read-only lmt.
> >
> > Off to experiment......
> >
> > Rachel
> >
> > --- Darrell Landrum <[EMAIL PROTECTED]> wrote:
> > > I haven't tested this but would imagine it entirely possible.
> > > What I wanted to throw out though, is somewhat of a related
> > caution.
> > > You can drop a table from a read only tablespace. I discovered
> > this
> > > in
> > > test, fortunately when I was finished testing with that table and
> > > intentionally dropped it while the tablespace was in read only
> > mode.
> > >
> > > >>> [EMAIL PROTECTED] 06/18/03 09:49AM >>>
> > > Hi,
> > >
> > > I would like to know if it is possible and what the pitfalls are if
> >
> > > I
> > > do
> > > the following.
> > >
> > > Partition a large table into partitions based on date.
> > > Data is only entered and read and never altered, so I would like to
> > > move
> > > older partitions to read only tablespaces and possible read only
> > > devices so
> > > the backup will be made quicker.
> > >
> > > Is it possible to have parttions of the same table spread across
> > read
> > > only
> > > and read/write tablespaces?
> > > Am I correct in assuming that once you backup a read only
> > tablespace
> > > there
> > > is no need to backup the same again. (provided you don't make it
> > > read/write
> > > add data and make it read only again).?
> > > Does anybody have a procedure already that automatically creates
> > the
> > > new
> > > partitions let say every month?
> > >
> > >
> > > TIA
> > >
> > > Jacob A. van Zanen
> > > Oracle DBA
> > > Quant Systems Europe b.v.
> > > Tel : +31 (0) 251 - 268 268
> > > Mobile: +31 (0) 6 51308813
> > > Fax: +31 (0) 251 - 268 269
> > > E-mail: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> > > Visit our web site at http://www.quantsystems.nl/
> > > <http://www.quantsystems.nl/>
> > >
> > >
> > > --
> > > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > > --
> > > Author: Darrell Landrum
> > > INET: [EMAIL PROTECTED]
> > >
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-- 
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-- 
Author: Arup Nanda
  INET: [EMAIL PROTECTED]

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