Martin's proposal at least looks sensible; he just hasn't quite made the case that it's worth doing. If you're running a system that hardly ever crashes, you might be willing to accept index rebuilds during crash recovery, especially for indexes on relatively small, but frequently updated, tables (which should have reasonably short rebuild times). Obviously this would have to be configurable per-index, or at least per-table, and I agree that it likely would never be the default. But it could be a good tradeoff for some cases.
My web system hasn't crashed in years, and last time I upgraded the index rebuild time was maybe 30 mins? So, I think a typical web application doesn't _really_ have that much data, and would greatly benefit from cranking the TPS.
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