rusage (Re: Good afternoon.)

Hi,

On Wed, Mar 06, 2019 at 04:09:46PM -0400, Kenia Vergara wrote:
> Good afternoon.
> I need to know the commands to display the execution time, CPU usage and
> memory usage, but through the Postgres console.Thank you.

Does this do what you want ? Note that the "QUERY STATISTICS" are log output,
and not a part of the sql result.

$ psql postgres -Atc "SET client_min_messages=log; SET log_statement_stats=on" -c 'explain analyze SELECT max(i) FROM generate_series(1,999999)i'
SET
LOG: QUERY STATISTICS
DETAIL: ! system usage stats:
! 0.625402 s user, 0.059799 s system, 0.687496 s elapsed
! [0.629882 s user, 0.059799 s system total]
! 10672 kB max resident size
! 0/27344 [0/27344] filesystem blocks in/out
! 0/1378 [0/2365] page faults/reclaims, 0 [0] swaps
! 0 [0] signals rcvd, 0/0 [0/0] messages rcvd/sent
! 0/167 [2/167] voluntary/involuntary context switches
Aggregate (cost=12.50..12.51 rows=1 width=4) (actual time=680.155..680.161 rows=1 loops=1)
-> Function Scan on generate_series i (cost=0.00..10.00 rows=1000 width=4) (actual time=253.512..497.462 rows=999999 loops=1)
Planning Time: 0.227 ms
Execution Time: 686.200 ms

Justin