Camilo Porto wrote:
> I would like to better understand the semantics of the statistics shown in PostgreSQL Logs. For example, in the report:
> DETAIL: ! system usage stats:
> ! 0.000100 elapsed 0.000000 user 0.000000 system sec
> ! [0.016997 user 0.006998 sys total]
> ! 0/0 [0/0] filesystem blocks in/out
> ! 0/2 [0/1301] page faults/reclaims, 0  swaps
> ! 0  signals rcvd, 0/0 [0/0] messages rcvd/sent
> ! 0/0 [6/20] voluntary/involuntary context switches
The above are from getrusage(). See the getrusage manual page.
> ! buffer usage stats:
> ! Shared blocks: 1 read, 0 written, buffer hit rate = 0.00%
> ! Local blocks: 0 read, 0 written, buffer hit rate = 0.00%
> ! Direct blocks: 0 read, 0 written
> What each element of this report mean?
This outlines the shared/local buffer I/O and file system I/O performed.
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
+ If your life is a hard drive, Christ can be your backup. +
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