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Re: Performance degradation if query returns no rows and columnexpression is used after upgrading to 12 - Mailing list pgsql-general

From Pavel Stehule
Subject Re: Performance degradation if query returns no rows and columnexpression is used after upgrading to 12
Date
Msg-id CAFj8pRA9bk4_cYUj9=UWG-XyKfeRCawFD0j-BBRp0+4Z8u2Bjw@mail.gmail.com
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In response to Re: Performance degradation if query returns no rows and column expression is used after upgrading to 12  ("Andrus" <kobruleht2@hot.ee>)
Responses Re: Performance degradation if query returns no rows and column expression is used after upgrading to 12
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út 7. 4. 2020 v 19:09 odesílatel Andrus <kobruleht2@hot.ee> napsal:
Hi!
>on your query there is too slow JIT. Is strange how much. So the best way is disable JIT probably
>set jit to off;
>or same field in postgresql.conf
 
Thank you.
 
set jit to off 
 
makes select fast.
I have encountered this issue only in this query in one database
 
There is  variation of this query running with diferent data in different database in same Debian 10 server. It works fast.
Should I disable jit only for this query or in postgresql.conf permanently?

you can do it in session

SET jit to off;
SELECT ..
SET jit to DEFAULT;

It is really strange why it is too slow. Can you prepare test case? Looks like bug (maybe not Postgres's bug)

Pavel

 
Andrus.

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