On 2020-09-19 11:37, Amit Kapila wrote:
> I think we can change the documentation for parallel option to explain
> it better. How about: "Perform index vacuum and index cleanup phases
> of VACUUM in parallel using integer background workers (for the
> details of each vacuum phase, please refer to Table 27.37). The number
> of workers is determined based on the number of indexes on the
> relation that support parallel vacuum operation which is limited by
> number of workers specified with PARALLEL option if any which is
> further limited by max_parallel_maintenance_workers." instead of what
> is currently there?
I think the implemented behavior is wrong. The VACUUM PARALLEL option
should override the max_parallel_maintenance_worker setting.
Otherwise, what's the point of the command option?
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
