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Inec34040afI added a mention that there was no point in setting maintenance_work_limit to anything higher than 1GB for vacuum, but that was incorrect as ginInsertCleanup() also looks at what maintenance_work_mem is set to during VACUUM and that's not limited to 1GB. Here I attempt to make it more clear that the limitation is only around the number of dead tuple identifiers that we can collect during VACUUM. I've also added a note to autovacuum_work_mem to mention this limitation. I didn't do that inec34040afas I'd had some wrong-headed ideas about just limiting the maximum value for that GUC to 1GB. Author: David Rowley Discussion: https://postgr.es/m/CAApHDvpGwOAvunp-E-bN_rbAs3hmxMoasm5pzkYDbf36h73s7w@mail.gmail.com Backpatch-through: 9.6, same asec34040af