Sergey Konoplev <gray(dot)ru(at)gmail(dot)com> writes:
> On Thu, Oct 11, 2012 at 12:19 PM, Sahagian, David
> <david(dot)sahagian(at)emc(dot)com> wrote:
>> Are there any "extra" costs to logging all this cool stuff ?
>>
>> log_line_prefix = '%m %a %u %p %c %m %v %x'
> The formatting cost only but it is so insignificant that does not
> worth bothering with it.
IIRC, %m would imply a gettimeofday call, which might be expensive
depending on your OS and hardware. I think all the other info is
"just sitting around", though.
regards, tom lane