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
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