Re: Trouble managing planner for timestamptz columns - Mailing list pgsql-performance

"Marc Morin" <marc@sandvine.com> writes:
> Well this analyze just took 12 minutes...  Stats target of 100.
> # time psql xxx xxx -c "analyze elem_trafficstats_1"

Try analyzing just the one column, and try reducing its stats target to
10.  It does make a difference:

sorttest=# set default_statistics_target TO 100;
SET
Time: 0.382 ms
sorttest=# analyze verbose d10;
INFO:  analyzing "public.d10"
INFO:  "d10": scanned 30000 of 833334 pages, containing 3600000 live rows and 0 dead rows; 30000 rows in sample,
100000080estimated total rows 
ANALYZE
Time: 137186.347 ms
sorttest=# set default_statistics_target TO 10;
SET
Time: 0.418 ms
sorttest=# analyze verbose d10(col1);
INFO:  analyzing "public.d10"
INFO:  "d10": scanned 3000 of 833334 pages, containing 360000 live rows and 0 dead rows; 3000 rows in sample, 100000080
estimatedtotal rows 
ANALYZE
Time: 17206.018 ms
sorttest=#

            regards, tom lane