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Asked: 2026-05-27T23:40:03+00:00

I am in the middle of developing a C extension library for PostgreSQL. I

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I am in the middle of developing a C extension library for PostgreSQL. I am using a lot of ereport() calls to help with future debugging.

A typical example of usage in my code would be something like this:

ereport(NOTICE, (errmsg("[%s]: Returned nonzero result (%d).", (const char*)__FUNCTION__, ret)) );

However, when I look in /var/log/postgresql/postgresql-8.4-main.log my messages do not seem to be appearing there – only messages from what I assume is the db server daemon.

So, where are my log messages being stored?

BTW, I am running PG 8.4 on Ubuntu Linux (10.0.4)

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  1. Editorial Team

    By default, logging of non-critical messages is not enabled on fresh installs. You configure it by setting log_destination and logging_collector.

    PostgreSQL has several logging levels, and by default, NOTICE level is not saved to log files (even when they are enabled) . This is configured by log_min_messages setting. However NOTICE it emitted to client by default. This is configured by client_min_messages setting.

    So if you want these to be stored in log files, you will have to either change NOTICE to WARNING in your code, or set log_min_messages = notice.

    See this http://www.postgresql.org/docs/8.4/static/runtime-config-logging.html
    and maybe this http://www.depesz.com/index.php/2011/05/06/understanding-postgresql-conf-log/

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