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Since pg_upgrade does not transfer the cumulative statistics used to trigger autovacuum and autoanalyze, the server may take much longer than expected to process them post-upgrade. Currently, we recommend analyzing only relations for which optimizer statistics were not transferred by using the --analyze-in-stages and --missing-stats-only options. This commit appends another recommendation to analyze all relations to update the relevant cumulative statistics by using the --analyze-only option. This is similar to the recommendation for pg_stat_reset(). Reported-by: Christoph Berg <myon@debian.org> Reviewed-by: Christoph Berg <myon@debian.org> Discussion: https://postgr.es/m/aAfxfKC82B9NvJDj%40msg.df7cb.de