The problem is fully described in thread I mentioned earlier, Tom's excellent explanation can be found here:
http://groups.google.com/groups?hl=cs&lr=&frame=right&th=5227028cb3449572&seekm=11390.1080964720%40sss.pgh.pa.us#link14
Oh, that thing. Well, my opinion has not changed since April --- I don't think the problem justifies slowing down every transaction start.
My question was if the slowdown of every transaction start is really needed - If it is possible to find some other solution, for example add more logic to vacuum to pick up correct txn id (or little bit more "correct"). But unfortunately I have no idea how to do this because of my limited knowledge of Pg internals, the diffucult part I guess are the shared relations...
Kuba
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