On 1/8/25 11:00 AM, Ron Johnson wrote:
PG 14.13
The goal of "(now() - query_start)::INTERVAL MINUTE TO SECOND" column is
to see how many minutes and seconds ago that the query started. (Why?
Because that's useful to me, and the people I show the output to when
queries run for more than a few minutes. We don't need to see hours and
days; just the total MMMMM:SS.mmm.)
I'd hoped that ::INTERVAL MINUTE TO SECOND would do the trick, but
MINUTE TO SECOND seems to be ignored.
From here:
https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-INTERVAL-INPUT
"Also, field values “to the right” of the least significant field
allowed by the fields specification are silently discarded. For example,
writing INTERVAL '1 day 2:03:04' HOUR TO MINUTE results in dropping the
seconds field, but not the day field."
Is there cast magic that does what I want?
The only way I can think of extract the epoch from the interval and pass
to a function that builds what you want.
TAPc=# select pid
,datname as db, usename
,to_char(query_start, 'YYYY-MM-DD HH24:MI:SS.MS <http://SS.MS>')
as qry_start
,(now() - query_start)::INTERVAL MINUTE TO SECOND as qry_elapsed
,cast(state as char(11)) as state
from pg_stat_activity
WHERE pid != pg_backend_pid()
and state != 'idle';
pid | db | usename | qry_start |
qry_elapsed | state
---------+------+------------+-------------------------+-------------------------+-------------
657996 | | replicator | 2024-11-11 21:03:00.992 | 57 days
16:38:22.342449 | active
4070070 | TAPc | TAP | 2025-01-08 13:41:23.202 |
00:00:00.132817 | active
4070069 | TAPc | TAP | 2025-01-08 13:41:23.140 |
00:00:00.194222 | active
4070065 | TAPc | TAP | 2025-01-08 13:41:23.238 |
00:00:00.096418 | active
(4 rows)
--
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Adrian Klaver
adrian.klaver@xxxxxxxxxxx
