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Re: ORA - 14642 : partition exchange error

Jonathan Lewis

2004-03-01

Replies:

I think you're running into a problem with the
Hakan factor. This is a number used by the
bitmap index algorithms to limit the number
of rows that Oracle assumes can be stored
in a single block. It is (generally) dictated at
table creation time by the number and type
of non-null columns. Check tab$.spare1
just after creating a table.

Things can go wrong with partitioned tables,
though, as the table has a Hakan factor, but
in your case you've created a table to exchange
with it that has a different Hakan factor.

The closest reference to your problem comes
from (a) minimize_records_per_block, which
can only be used in the absence of bitmap indexes
on a table and resets the Hakan factor, and (b) a
note about dropping bitmap indexes before your
first compress a data segment in a partitioned
table.



Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html

March 2004 Hotsos Symposium - The Burden of Proof
Dynamic Sampling - an investigation
March 2004 Charlotte OUG (www.cltoug.org) CBO Tutorial
April 2004 Iceland
June 2004    UK - Optimising Oracle Seminar


----- Original Message -----
From: "Senthil Ramanujam" <sramanujam@(protected)>
To: <oracle-l@(protected)>
Sent: Monday, March 01, 2004 4:45 PM
Subject: ORA - 14642 : partition exchange error


> Hi All,
>
> I came across an interesting issue and thought i could get some info
> from the list. i did google around and metalinked, but no luck.
>
> Environment: 9.2.0.1 - Solaris 8 / HP-11i
>
> Actually, i was getting ORA-14642 when i was trying to exchange
> partition on one of my core tables. The example given below is how i can
> reproduce with simple example table. it shows me that if the table row
> length exceeds 8 characters, then it throws an error. If i reduce the
> column(mytext) length from 5 to 4 or anything less than 5, then
> everything runs fine.
>
> I know it doesnt makes sense to create table and then alter the same. it
> was the old script and we were able to fix this issue by creating the
> right column and constraints(i mean, no "alter" command run).
>
> I was just curious to know why it was failing and it seems like it was
> failing based on row length in this case. Originally it was failing on
> my hp(11i?) box and i tried the same on Solaris(8) and it failed there
too.
>
> any thoughts? has anyone seen this before? am i running into any known
> issues?
>
> appreciate it. thanks.
>
> senthil


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