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help / color / mirror / Atom feedFrom: Laurenz Albe <[email protected]>
To: Dave Cramer <[email protected]>
To: James Pang <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: cached plan must not change result type
Date: Sat, 30 Mar 2024 15:06:12 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CADK3HHJn79rvd0Si7XtQ8EfsaGK04A4fPhoBDng8A8aJkR8hrQ@mail.gmail.com>
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On Sat, 2024-03-30 at 08:27 -0400, Dave Cramer wrote:
> > On Fri, 29 Mar 2024 at 19:42, James Pang <[email protected]> wrote:
> > > we did DDL "alter table ... alter column increase varchar(512) to varchar(1024)",
> > > after that done, hours later, new query select on this table still failed this error.
> > > From this https://jdbc.postgresql.org/documentation/server-prepare/#re-execution-of-failed-statements ,
> > > looks like pgjdbc try to handle this exception and retry, but in our case, it did not happen.
> > > Could you direct me how to make this retry work?
> > > we only want new transactions,queries work that after the DDL changes.
>
> I think the best option for you is to turn off server side prepared statements with prepareThreshold=0
An alternative option is to take downtime for DDL and restart the application.
Or to chppse the appropriate data type right away: in your case, that would
have been "text".
Yours,
Laurenz Albe
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