On 29/03/2018 20:24, Alvar Freude wrote:
Hi,

Am 29.03.2018 um 10:30 schrieb Gunnar Nick Bluth <gunnar.bl...@pro-open.de>:

Thus, buffer_alloc is the global count of buffers allocated in the
cluster. That it appears in the bgwriter statistics is more or less
coincidental.
But it seems not to be the total shared_buffers used, but the total number of 
allocated and re-allocated buffers. So it increments every time a buffer is 
allocated. Maybe I’m the only one who misunderstands it – or someone with 
better english then me should update the docs. ;-)

But shared_buffers represents the max no of postgresql buffers, per server, at any given time. It is a limit (constant) not a metric. The count of all concurrent buffers at any given time must be less than shared_buffers.
So my question is : Does buffer_alloc represent the total read/write traffic of 
the database since the last reset?

Ciao
  Alvar

--
Alvar C.H. Freude | http://alvar.a-blast.org
https://blog.alvar-freude.de/
https://www.wen-waehlen.de/


--
Achilleas Mantzios
IT DEV Lead
IT DEPT
Dynacom Tankers Mgmt


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