如何在 PostgreSQL 中提交处于空闲 state 的事务？

Question

Is there a way to commit a transaction that is in an idle state in Postgres?

If we use idle_in_transaction_session_timeout it kills and rollbacks the transaction, but is there any way to commit and complete the session, I can't see any blocked by PID, I am using postgre10. Or is there any way I can find what is blocking these sessions? all these seem to be the result of the orphan processes from the application.

APPNEW=# SELECT datname
APPNEW-# ,pid
APPNEW-# , usename
APPNEW-# , wait_event_type
APPNEW-# , wait_event
APPNEW-# ,backend_start
APPNEW-# ,state
APPNEW-# , pg_blocking_pids(pid) AS blocked_by
APPNEW-# ,query
APPNEW-# FROM pg_stat_activity
APPNEW-# WHERE wait_event IS NOT NULL
APPNEW-# order by backend_start;
 datname |  pid  |   usename   | wait_event_type |     wait_event      |         backend_start         |        state        | blocked_by | query
---------+-------+-------------+-----------------+---------------------+-------------------------------+---------------------+------------+--------------------------------------------------
 APPNEW   |  4227 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:26.956884+12 | idle                | {}         | BEGIN;commit
 APPNEW   |  4305 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:35.955987+12 | idle                | {}         | BEGIN;commit
 APPNEW   |  4314 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.002783+12 | idle                | {}         | commit
 APPNEW   |  4323 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.046023+12 | idle                | {}         | BEGIN;commit
 APPNEW   |  4332 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.088676+12 | idle                | {}         | commit
 APPNEW   |  4341 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.137323+12 | idle                | {}         | BEGIN;commit
 APPNEW   |  4350 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.185843+12 | idle                | {}         | commit
 APPNEW   |  4359 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.227245+12 | idle                | {}         | BEGIN;commit
 APPNEW   |  4368 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.288329+12 | idle                | {}         | commit
 APPNEW   |  4377 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.337534+12 | idle                | {}         | commit
 APPNEW   |  4386 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.402352+12 | idle                | {}         | commit
 APPNEW   |  4395 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.439634+12 | idle                | {}         | commit
 APPNEW   |  4404 | appnew     | Client          | ClientRead          | 2020-07-26 14:28:36.481263+12 | idle                | {}         | commit
 .
 .
 (240 rows)

Answer 1

Those are sessions that are "idle", not transactions.

An idle session has no pending transaction that can (or needs to) be committed.

There is nothing you need to do

Answer 2

'ClientRead' means they are blocked waiting for the client to send another command. Which it is not doing. If they were inside a transaction, the state would be called 'idle in transaction', not just 'idle'. You can't make them commit, as there is nothing to commit.