Tom Lane <t...@sss.pgh.pa.us> wrote: >> I'm still not convinced that using shared memory is a bad way to >> pass these around. Surely we're not talking about large numbers >> of them. What am I missing here? > > They're not of a very predictable size. Surely you can predict that any snapshot is no larger than a fairly small fixed portion plus sizeof(TransactionId) * MaxBackends? So, for example, if you're configured for 100 connections, you'd be limited to something under 1kB, maximum? -Kevin
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