Florian Weimer <fweimer(at)bfk(dot)de> writes:
> * Adrian Klaver:
>>> Interesting. Is there an easy way to monitor WAL traffic in away?
>> They are found in $DATA/pg_xlog so checking the size of that
>> directory regularly would get you the information.
> But log files are recycled, so looking at the directory alone does not
> seem particularly helpful.
"du" would be useless, but you could check the name of the newest WAL
segment file from time to time, and do a bit of math to see how much
WAL had been written since the previous time.
regards, tom lane