Re: Ynt: rowid and create table as...

thx, i will use a sequence instead

"Thomas Kyte" <tkyte_at_us.oracle.com> wrote in message news:m4ghitgl37pdkqc8dfo5fkvi1sf8ra47k7_at_4ax.com...
>
> On Wed, 13 Jun 2001 08:20:39 +0300, you wrote:
>
> >
> >Steffen Ramlow <s.ramlow_at_gmx.de> wrote in message
> >news:9g5ncd$7dp9f$1_at_ID-54600.news.dfncis.de...
> >> when i do:
> >> create table xxx as select empno, ename from emp order by ename;
> >>
> >> can i be sure that the rows are inserted into xxx ordered by ename and
 that
> >> the rowids are ascending?
>
> the data will be inserted ordered meaning that initially (before any other
> inserts/updates/deletes) data on a given block will be pretty much sorted.
 All
> of the A's will be together, the B's and so on.
>
> You cannot make any assumption about the rowid which is a function of the
> file/block/slot.
>
> We may use file 5 and after running out of room then file 3.
>
> We may use an extent from the end of the file and then the front.
>
> The data will be physically colacated based on ename initially but the
 rowids
> should be considered random data.
>
> >I think it depends on the version you use...starting from oracle 8i you
 may
> >use "create table xxx select ......from table ORDER BY ..." and the rows
 are
> >inserted in the order which you chose..If I am wrong please correct me...
> >
> >Murat
> >
> >
> >
> >>
> >>
> >>
> >>
> >>
> >
>
> --
> Thomas Kyte (tkyte_at_us.oracle.com) Oracle Service Industries
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>
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>
> Opinions are mine and do not necessarily reflect those of Oracle Corp
Received on Thu Jun 14 2001 - 09:13:00 CDT