Oracle-L: RE: 9i / 9iRAC : Segment_Space_Management AUTO, with LOB Segments

From: MacGregor, Ian A. <ian_at_SLAC.Stanford.EDU>
Date: Sat, 14 Dec 2002 15:03:37 -0800
Message-ID: <F001.00519D90.20021214150337@fatcity.com>

Was the prohibitition on placing LOB's into tablespaces with automatic segment space management only a bug. I ask because the description of "auto" segment space management includes the following restrictions

Restrictions on AUTO:

You can specify this clause only for permanent, locally managed tablespace.
You cannot specify this clause for the SYSTEM tablespace.
- You cannot store LOBs in AUTO segment-managed tablespaces.
  The above is from the 9.0.1 SQL manual.

One usually associates a bug with something the manual says one can do, but one cannot. I've not seen the 9.0.2 manual. Are the restrictions lifted?

In a single instance environment unless you are doing something out of the ordinary, use of the clause will probably be detrimental.

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_slac.stanford.edu

-----Original Message-----
Sent: Friday, December 13, 2002 7:19 PM
To: Multiple recipients of list ORACLE-L

The first time we tried importing our 8.1.5 [OPS] database into 9.0.1 and 9.2.0.1 with
EXTENT_MANAGEMENT Local for ALL tablespaces SEGMENT_SPACE_MANAGEMENT Auto
we found that tables with LOB segments could not be created. This was a 9.0.1 bug which was expected to have been fixed in 9.2 [I believe it was Bug 1626182, referenced in Note 159078.1]

However, after going to 9.2.0.2, I WAS able to create such tables in the database.
[the Patchset Notes include a reference to Bug 2326066. Unfortunately, I can't see either bug on MetaLink to verify if both are the same issue]

9iRAC strongly recommends SEGMENT_SPACE_MANAGEMENT Auto instead of using Free_Lists and Free_List_Groups. [Part 3, Appendix B of the 9iRAC Deployment and Performance manual].

Are there any real-life experiences / gotchas with LOB Segments in Locally Managed Tablespaces and Segment_Space_Management Auto ? There seem to be a number of bug-fixes for Segment_Space_Management=AUTO in the 9.2.0.2 PatchSet Release Notes.

Hemant K Chitale
My web site page is : http://hkchital.tripod.com

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Author: MacGregor, Ian A.
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