On 12/28/2016 11:54 PM, Gerhard Wiesinger wrote:
Hello,
PostgreSQl 9.6.1: after a pg_dump/restore procedure it scans all pages
(at least for some of the tables, analyze-only switch is specified).
I would expect that only the sample rows are scanned.
"log_details": scanned 2133350 of 2133350 pages
vacuumdb --analyze-only --all --verbose
INFO: analyzing "public.log"
INFO: "log": scanned 30000 of 30851 pages, containing 3599899 live rows
and 0 dead rows; 30000 rows in sample, 3702016 estimated total rows
INFO: analyzing "public.log_details"
INFO: "log_details": scanned 2133350 of 2133350 pages, containing
334935843 live rows and 0 dead rows; 3000000 rows in sample, 334935843
estimated total rows
INFO: analyzing "public.log_details_str"
INFO: "log_details_str": scanned 30000 of 521126 pages, containing
3601451 live rows and 0 dead rows; 30000 rows in sample, 62560215
estimated total rows
Any ideas why?
I would say because the '3000000 rows in sample' where spread out over
all 2133350 pages.
Thnx.
Ciao,
Gerhard
--
Adrian Klaver
adrian.kla...@aklaver.com
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