Josh Berkus wrote: [quoted out of order]

Looking at your analyze, though, I think it's not the sort that's taking the time as it is that the full sorted entity_id column won't fit in work_mem. Try increasing it?

Yup, that indeed fixed this particular query since neither table was particularly large.

It still has to sort because the clustering isn't guarenteed to be 100%.

I guess I was contemplating whether or not there are some conditions where it could be 100% (perhaps combined with Hannu's read only table speculation).

However, such sorts should be very quick as they have little work to do.

True, so long as the table can fit in work-mem. For much larger tables IMHO it'd be nice to be able to simply do a seq-scan on them if there were some way of knowing that they were sorted.

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