Alvaro Herrera <[EMAIL PROTECTED]> writes:
> Tom Lane wrote:
>> But it seems that we need a band-aid for 8.1 and earlier.  The simplest
>> fix I can think of is for vacuum not to attempt to advance the
>> datvacuumxid/datfrozenxid fields if it skipped over any temp tables of
>> other backends.  That's a bit nasty, since in a database making heavy
>> use of temp tables, you might do a whole lot of vacuums without ever
>> meeting that condition.  Anyone have a better idea?

> That seems nasty.  Can we examine the xmin of the pg_class entry for
> temp tables instead?

No, because any sort of schema update on the temp table would rewrite
its pg_class row with a newer version.  You couldn't assume that the
pg_class row is older than what's in the table.  Consider this perfectly
reasonable scenario:

        CREATE TEMP TABLE foo ...
        COPY foo FROM ...
        CREATE INDEX ...                <- must set relhasindex

                        regards, tom lane

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