Re: How to print application_name in log_line_prefix (using %a)? - Mailing list pgsql-general

On 10/29/2012 04:00 AM, Chris Angelico wrote:
> On Mon, Oct 29, 2012 at 5:44 PM, Tianyin Xu <tixu@cs.ucsd.edu> wrote:
>> Got it! Thanks, Chris!
>>
>> I still wonder why application_name appears in the configuration file if it
>> cannot take effort :-P
>
> Not sure what you mean by that, but my postgresql.conf doesn't have
> anything about application_name. But if it did, it would be a default
> that an application can override.

Actually it does:

log_line_prefix =  #   %a = application name
                    #   %u = user name
                    #   %d = database name

http://www.postgresql.org/docs/9.2/interactive/runtime-config-logging.html#GUC-APPLICATION-NAME
                    ....
It is a chicken and egg situation. See section 31.1.2. Parameter Key
Words of below:

http://www.postgresql.org/docs/9.2/interactive/libpq-connect.html

"application_name
Specifies a value for the application_name configuration parameter."

>
> ChrisA
>
>


--
Adrian Klaver
adrian.klaver@gmail.com