Re: BUG #2278: problem with grants - Mailing list pgsql-bugs

From Richard Huxton
Subject Re: BUG #2278: problem with grants
Date
Msg-id 43FC63F2.6080807@archonet.com
Whole thread Raw
In response to BUG #2278: problem with grants  ("Tomasz Kliczak" <tklimczak@atsisa.com>)
List pgsql-bugs
Tomasz Kliczak wrote:
>   CONSTRAINT sy_task_priority FOREIGN KEY (sy_b_id)
>       REFERENCES sy_b (id) MATCH SIMPLE

> When i try to add something into table  dt_a I get error :
>
> ERROR: permission denied for relation sy_task_priority
> CONTEXT: SQL statement "SELECT 1 FROM ONLY "public"."sy_b" x WHERE "id" = $1
> FOR UPDATE OF x"
>
> I want to have constraint on table dt_a, and for table sy_b only SELECT
> grant.
> But when I add UPDATE grant on sy_b it works.

That's because the foreign-key takes a lock to *prevent* updates. To do
this it takes an update lock though, which is why you see the error message.

HTH
--
   Richard Huxton
   Archonet Ltd

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