yep.
what I was wondering was at what point for storage in general, are the
"points of inflection" for # of segments per tablespace, # of extents
per segment - where a performance hit occurs, when the header block
overflows.
I saw that a tablespace had > 34000 extents in it - but then saw that
only 1 segment had > 505 extents - so I let it go.
just didn't want the extra I/O fetch every time.
Paul
Rachel Carmichael wrote:
>
> Mike,
>
> Thanks, I didn't really believe Oracle would "take back" the maxextents
> unlimited option, I just thought it was funny that the recommendation was
> now going back to the original extent recommendations :)
>
> Rachel
>
> >From: [EMAIL PROTECTED]
> >Reply-To: [EMAIL PROTECTED]
> >To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
> >Subject: Re: Fragmentation & Locally Managed Tablespaces
> >Date: Thu, 28 Jun 2001 04:35:35 -0800
> >
> >
> >
> >Rachel,
> >That maximum isn't a hard limit. Oracle themselves impose no limit of this
> >kind.
> >After you use all of the available space in the segment header block, any
> >additional space map entries are overflowed into additional extent maps
> >within
> >the segment.
> >This means that because the used extent information isn't cached in the
> >data
> >dictionary, queries against dba_extents etc. can cause many blocks to be
> >read
> >from LMTs if the map entries have overflowed in this manner.
> >
> >Therefore, the limitation is more of a recommendation to ensure that good
> >performance is maintained.
> >
> >Regards,
> >Mike
> >
> >
> _________________________________________________________________
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