Re: PG 10 experience different user execute same sql get different access plan

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Zhiyu ZY13 Xu <xuzy13(at)lenovo(dot)com>
Cc: "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: Re: PG 10 experience different user execute same sql get different access plan
Date: 2021-05-19 15:00:18
Message-ID: 3430781.1621436418@sss.pgh.pa.us
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Zhiyu ZY13 Xu <xuzy13(at)lenovo(dot)com> writes:
> I experience a PG optimizer problem. Different user query with same SQL at same time. But get different access plan.

If you've got row-level security turned on for that table, it could
explain results like this. RLS limits the planner's ability to
see statistics, which can easily result in a worse plan.

regards, tom lane

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