Hello David & David, I have a similar problem -- a lot of idle transactions. I'm using the PostgreSQL JDBC driver. The connections look like this:
pid | wait_event | state_change | backend_start | xact_start | query_start | ?column? | query -------+------------+-------------------------------+-------------------------------+------------+-------------------------------+-----------------+-------- 32506 | ClientRead | 2020-04-23 09:29:05.6793-07 | 2020-04-23 01:00:19.612478-07 | | 2020-04-23 09:29:05.679275-07 | 00:00:00.000025 | COMMIT 32506 | ClientRead | 2020-04-23 09:30:33.247119-07 | 2020-04-23 01:00:19.612478-07 | | 2020-04-23 09:30:33.247109-07 | 00:00:00.00001 | COMMIT 32506 | ClientRead | 2020-04-23 09:31:31.506914-07 | 2020-04-23 01:00:19.612478-07 | | 2020-04-23 09:31:31.506905-07 | 00:00:00.000009 | COMMIT 32506 | ClientRead | 2020-04-23 09:32:32.06656-07 | 2020-04-23 01:00:19.612478-07 | | 2020-04-23 09:32:32.066552-07 | 00:00:00.000008 | COMMIT 32506 | ClientRead | 2020-04-23 09:36:51.579939-07 | 2020-04-23 01:00:19.612478-07 | | 2020-04-23 09:36:51.579931-07 | 00:00:00.000008 | COMMIT It seems like they haven't been doing anything for a long time, but the state_change keeps getting updated. Is it possible that state_change is being updated, maybe by the JDBC driver? Do you recommend using PgBouncer with JDBC? ----- Si Chen Open Source Strategies, Inc. Our Mission: https://www.youtube.com/watch?v=Uc7lmvnuJHY On Thu, Apr 23, 2020 at 11:41 AM David G. Johnston < david.g.johns...@gmail.com> wrote: > On Thursday, April 23, 2020, David Gauthier <davegauthie...@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. > >
