Will something bad happen if I put index on xmin ?

Hi,

I'm about to write a simple one-way replication script relying on xmin
and would like to speed up things by putting an index on it.

So I have a few questions:

1. Will something bad happen if I put index on xmin ?

2. Is it just a bad idea to do it that way ?   (there will be no deletes, just mainly inserts and some updates)


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Hannu