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. ;-)
postgres=# SELECT
buffers_alloc*current_setting('block_size')::numeric/1024/1024/1024,
current_setting('shared_buffers') FROM pg_stat_bgwriter;
?column? | current_setting
-----------------------+-----------------
1219.7707748413085938 | 64450MB
(1 row)
Or other machine:
?column? | current_setting
----------------------+-----------------
126.4642944335937500 | 64450MB
(1 row)
Small one:
?column? | current_setting
--------------------+-----------------
3.3014221191406250 | 6GB
(1 Zeile)
Ciao
Alvar
--
Alvar C.H. Freude | http://alvar.a-blast.org
https://blog.alvar-freude.de/
https://www.wen-waehlen.de/
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