On Thursday, April 23, 2020, David Gauthier <
davegauthierpg@gmail.com> wrote:
Hi:
psql (9.6.7, server 11.3) on linux
I have what appear to be a log of idle connections to my DB. Query of pg_stat_activity indicates well over half (127/206) are like this...
dvdb=# select state_change,wait_event_type,wait_event,state,backend_type from pg_stat_activity where query = '';
state_change | wait_event_type | wait_event | state | backend_type
-------------------------------+-----------------+---------------------+-------+------------------------------
2020-04-23 12:57:58.215854-04 | Client | ClientRead | idle | client backend
What does this indicate?
The vast majority of the connections are through perl/dbi. If a connection is made, and is currently not doing anything, does it appear in pg_stat_activity as "idle" ? If, in DBI, $dbh->disconnect is used whenever the DB is no longer needed, will it disconnect from the DB and NOT appear as an idle in pg_stat_activity ?
If there are any other column s in pg_stat-activity you'd like to see, or any other query in any of the system tables, please advise.
If the server has an active, authenticated, connection/process running it shows up here. Yes, idle is the state used to denote the the session is “not doing anything”...
$dbh->disconnect typically will indeed close the connection. There can be exceptions if your architecture uses connection pooling.
David J.
