Re: System vs non-system casts

On 2005-04-12, Robert Treat <xzilla@users.sourceforge.net> wrote:
> One potential ugly way to do it would be to use the magical "last system oid" 
> as a differentiator between those created by pg and those created by the 
> user.  It would be different for every version so that might be a problem. 

That is what pg_dump does when talking to pre-7.2 databases. But it isn't
entirely reliable because oid wrap can allow the user to create objects
with oids < datlastsysoid. (If it was BootstrapOid you were thinking of,
that doesn't work at all because the system casts are added after the
bootstrap stage.) 

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Andrew, Supernews
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