On Tue, Oct 18, 2016 at 4:08 PM, Rahila Syed <rahilasyed90@gmail.com> wrote:
>>Another point which needs some thoughts is whether it is good idea to
>>use index relation size to calculate parallel workers for index scan.
>>I think ideally for index scans it should be based on number of pages
>>to be fetched/scanned from index.
> IIUC, its not possible to know the exact number of pages scanned from an
> index
> in advance.
We can't find the exact numbers of index pages to be scanned, but I
think we can find estimated number of pages to be fetched (refer
cost_index).
--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com