Re: Q: limit the length of log file entries?

On 9/3/25 08:40, Albrecht Dreß wrote:
> Hi all,
>
> I wonder if it would be possible to limit the length of individual log lines being written to the log file.
>
> Background:
> I have a PL/PGsql DB function 'addval(_id text, _data bytea) RETURNS VOID'. When a broken bytea is passed as 2nd parameter, something like
>
> albrecht(at)test FEHLER: ungültige hexadezimale Ziffer: »r« bei Zeichen 28
> albrecht(at)test ANWEISUNG: SELECT FROM addval('hopp', '\xbroken')
>
> is printed in the log file. This is fine and very helpful in this case, but I have a “friendly user” who transmitted a broken hex string of ~100 KBytes as second parameter, resulting in a log line of this size which is not really readable and when done frequently quickly fills the logs.
>
> The log settings are, inter alia
>
> log_parameter_max_length = 256
> log_parameter_max_length_on_error = 256
> log_error_verbosity = TERSE

Did you reload the server after making the above changes?

Did you take a look at output from:

https://www.postgresql.org/docs/current/view-pg-settings.html

for appropriate settings name to see if something is overriding the
settings you changed?

>
> but seem to have not the desired effect in this case.

Did it have any effect?

>
> I use PostgreSQL version 17.6-1.pgdg13+1 on Debian Trixie.
>
> Thanks in advance for any help,
> Albrecht.

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com