Oracle FAQ Your Portal to the Oracle Knowledge Grid

Home -> Community -> Mailing Lists -> Oracle-L -> Re: DATAFILE??


From: <>
Date: Wed, 19 Oct 2005 11:27:39 +1000
Message-ID: <>

I concur with the references to the fine manuals. But for what it's worth, in 8.1.7 on Solaris, I have noticed that when rebuilding large tables in DMT (to implement archiving without partitioning [another story]) Oracle is allocating extents in a circular fashion. By that I mean that extent 1 is in file 1, extent 2 in file 2, extent 3 in file 3, extent 4 in file 1, extent 5 in file 2, you get the picture.
 Extents are allocated slowly over time which suggests to me that an extent is allocated only after the previous extent is full. Makes sense really, given the next extent parameter on CREATE TABLESPACE. Doesn't Oracle then allocate blocks within those extents sequentially? I've never really cared enough to investigate so I have no hard information here except TFM.  These are my observations only. It's been a while since I studied the concepts manual so I can't recall exectly what it says on this topic. But I can recall my experiences from testing.
 So I strongly recommend researching (Oracle, google, forum archives) followed by controlled testing to verify!  I consider myself to be very green at oracle admin but I am always suprised to see such questions, and when I do I watch closely for the entertaining responses. Mladen never dissappoints, thankyou Mladen!  And to others that don't like the RTFM message, remember the old addage, "If you ask a silly question, expect a silly answer!" Yes I know this forum is here to help but often the best advice really is to recommend that the readily available manuals first be consulted. Otherwise this will become the place people will turn to for silly questions like "URGENT: CREATE TABLE SPACE or CREATE TABLESPACE"

  On 10/19/05, Gogala, Mladen <> wrote:
> WE get it? Who is "we"? The rule says that there are no stupid question.
> This is an exception.
> I am glad to help you clarify things. We are glad that you get it.
> --
> Mladen Gogala
> Ext. 121
> ------------------------------
> *From:* Marquez, Chris []
> *Sent:* Tuesday, October 18, 2005 12:27 PM
> *To:* Gogala, Mladen; Oracle Mailing List
> *Subject:* RE: DATAFILE??
> Right, we get can't believe the stupidity of this question.

Received on Tue Oct 18 2005 - 20:30:06 CDT

Original text of this message