Fwd: RE: 9i / 9iRAC : Segment_Space_Management AUTO, with LOB

[Hemant K Chitale]

Ian,
Could you explain how ASSM could be detrimental in a single instance environment ?

Vivek,
Could you provide details on the issues [BugNos, description of the problem, your findings]
you had with ASSM in 9iRAC ?

Hemant
At 07:09 AM 19-12-02 -0800, you wrote:

 
As part of a RAC benchmark with 9.2 we had faced severe LOCKING
on setting segment space management AUTO & had to REMOVE it
 
HTH

-----Original Message-----

From: Hemant K Chitale [mailto:[EMAIL PROTECTED]]

Sent: Sunday, December 15, 2002 8:09 AM

To: Multiple recipients of list ORACLE-L

Subject: RE: 9i / 9iRAC : Segment_Space_Management AUTO, with LOB

<<quotes from Oracle Manuals deleted >>

Bottomline :  Either it was a bug or a restriction, it was not possible in 9.0.1 and supposed to be possible in 9.2.0 --- definitely
works in 9.2.0.2

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

Hemant

At 03:03 PM 14-12-02 -0800, you wrote:

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

<< quote from 9.0.1 manual deleted >>

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
[EMAIL PROTECTED]

 

-----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

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

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