> this information gives a complete picture of vacuum efficiency, because > analyzing only total_time statistics does not give a complete picture of > what vacuum did: was it cleaning almost huge index, cleaning tables or > just sleeping.
The purpose of total_time is to be able to calculate the average time of a vacuum per relation from pg_stat_all_tables (by total_time/vacuum_count) This is useful on its own to be able to trend slow downs of vacuum ( or improvements after vacuum tuning ) for specific relations. The work going into [1] is more detailed and will be useful for deep dive investigations.In short, I think both proposals have merit. [1] https://commitfest.postgresql.org/51/5012/ Regards, Sami
