Hi, On 2021-05-27 11:07:53 +0900, Michael Paquier wrote: > This depends on the number of attributes, but I do see an extra 0.5% > __memmove_avx_unaligned_erms in reform_and_rewrite_tuple() for a > normal VACUUM FULL with a 1-int-column relation on a perf profile, > with rewrite_heap_tuple eating most of it as in the past, so that's > within the noise bandwidth if you measure the runtime. > What would be the worst case here, a table with one text column made > of non-NULL still very short values?
I think you need a bunch of columns to see it, like in the benchmark I just posted - I didn't test any other number of columns than 10 though. Greetings, Andres Freund
