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Re: Hint /*+NESTED_TABLE_SET_REFS+*/

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Fri, 22 Oct 1999 20:40:04 +0100
Message-ID: <940621555.17436.0.nnrp-10.9e984b29@news.demon.co.uk>

Wind-up comments aside -

At present it is hard to say if you 'need to know'. There are numerous unpublished hints, and some of them may be useful: for example PUSH_SUBQ was available several upgrade releases before it was documented.

In this case, I wonder if this is a hint which tells Oracle to use some subtle code that allows REF columns to be re-valued on import so that they point to the things they pointed to at export time. (I think REF columns are generated by SYS_GUID, so would need to become invalid if imported to another database).

If so, this might be a cute trick for resolving, or clearing, dangling refs. (Yet another exercise left to the reader.)

--

Jonathan Lewis
Yet another Oracle-related web site: http://www.jlcomp.demon.co.uk

Connor McDonald wrote in message <38103FF0.1EAE_at_yahoo.com>...
>
>which of course leads to me my next questions...
>
>How do find what they do ?
>Do I need to know ?
>Why does it appear during imports ?
>
>
>--
>===========================================
>Connor McDonald
>"These views mine, no-one elses etc etc"
>connor_mcdonald_at_yahoo.com
>
>"Some days you're the pigeon, and some days you're the statue."
Received on Fri Oct 22 1999 - 14:40:04 CDT

Original text of this message

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