| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Sanyo Moura <sanyo(dot)moura(at)tatic(dot)net> |
| Cc: | pgsql-performance(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Query with high planning time at version 11.1 compared versions 10.5 and 11.0 |
| Date: | 2018-11-27 15:00:08 |
| Message-ID: | 793.1543330808@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-performance |
Sanyo Moura <sanyo(dot)moura(at)tatic(dot)net> writes:
> And below are the times generated by EXPLAIN ANALYZE:
> 10.5
> Planning time: 126.080 ms
> Execution time: 2.306 ms
> 11.0
> Planning Time: 7.238 ms
> Planning Time: 2.638 ms
> 11.5 (I assume you mean 11.1 here)
> Planning Time: 15138.533 ms
> Execution Time: 2.310 ms
There were no changes between 11.0 and 11.1 that look like they'd affect
planning time. Nor does it seem particularly credible that planning time
would have dropped by a factor of 15 between 10.x and 11.x, especially
not given that the resulting plan didn't change. I think you've got some
external factor causing long planning times --- maybe something taking an
exclusive lock on one of the tables, or on pg_statistic?
regards, tom lane
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