Re: datafiles space allocation algorithm

Hi

I used import.

the main reason I am worrying how Oracle allocate space is I have created 8 filesystems for a new database, I have created 8 tablespaces, each with 8 datafiles spread in 8 filesystems. I have 200GB in each filesystem. The problem is I have not been able to import suucessfulyl ever, filesystem allocates spaces randomly and some of them always grows much faster and one would reach 100% and causing error in my import session

thanks

Alex

On 10/6/06, Mark W. Farnham <mwf_at_rsiz.com> wrote:
>
> What manner of technology was the load? How many rows?
>
>
>
> With the answers to those questions and a query including the file numbers
> for the datafiles and another with the rowid broken into the useful pieces
> and another adding up vsize(column_name) for each column in the table, plus
> an assurance that you don't have any columns that might be stored "out of
> line", we can answer your question. (Or the answer will become obvious to
> you as the query result spills out.)
>
>
>
> Computing statistics on the table in question might also be useful if
> you're on a release that has statistics. You have tablespaces, so I'm pretty
> sure you're at least on Oracle Version 6.0, unless of course you aliased
> your column names in the query below.
>
>
>
> From the data below you might only have two rows….
>
>
>
> mwf
>
>
>
> PS: If you want to see where Oracle puts each row and the order for sure,
> you're going to need the logical row number in the data you are loading.
> Then the answer of where Oracle stashed each row will be truly obvious if
> you select the useful rowid bits and the logical row number order by logical
> row number. (Not rownum, but an actual column added to the table containing
> an ordered numeric sequence. Single stride ascending integers would be most
> user friendly, and you might want to start with 10001 for reasons beyond the
> scope of this thread. Or you could start with 42.
>
>
> ------------------------------
>
> *From:* oracle-l-bounce_at_freelists.org [mailto:
> oracle-l-bounce_at_freelists.org] *On Behalf Of *amonte
> *Sent:* Friday, October 06, 2006 4:53 AM
> *To:* oracle-l_at_freelists.org
> *Subject:* datafiles space allocation algorithm
>
>
>
> Hi
>
> Suppose we have 4 datafiles in a tablespace, when we load data into this
> tablespace how will Oracle assign the space? I thought it would use
> round-robin like but it does not.
>
> Before load I had datafiles which looked like this:
>
> TABLESPACE_NAME
> FILE_NAME BYTES
> ------------------------------
> ------------------------------------------------ ----------
> PM_IND_T01
> /u02/oradata/vmw1020/PM_IND_T01_SIMP001.dbf 16
> PM_IND_T01
> /u02/oradata/vmw1020/PM_IND_T01_SIMP002.dbf 16
>
> After load it shows this:
>
> TABLESPACE_NAME
> FILE_NAME BYTES
> ------------------------------
> ------------------------------------------------------------ ----------
> PM_IND_T01
> /u02/oradata/vmw1020/PM_IND_T01_SIMP001.dbf 272
> PM_IND_T01
> /u02/oradata/vmw1020/PM_IND_T01_SIMP002.dbf 1984
>
> How does this work?
>
> Thanks
>
> Alex
>

--
http://www.freelists.org/webpage/oracle-l