postgres session timeout - ghdrako/doc_snipets GitHub Wiki

  1. From PostgreSQL v14 on, you can set the idle_session_timeout parameter to automatically disconnect client sessions that are idle.
SELECT * FROM pg_settings WHERE name = 'idle_session_timeout'  # zamyka sesjie bez tranzakcji idle po czasie np 10000 (10s)

SELECT * FROM pg_settings WHERE name = 'idle_in_transaction_session_timeout' # zabija sesje w tranzakcji ktora sie nie zakonczyla

  1. Up to PostgreSQL 13, you can use my extension pg_timeout. https://api.pgxn.org/src/pg_timeout/pg_timeout-1.0.0/README.md This extension has been validated with PostgresSQL 9.5, 9.6, 10, 11 and 12

  2. use a cron job to look at when the connection was last active (see pg_stat_activity) and use pg_terminate_backend to kill old ones

  • A connection is considered inactive if its state is either idle, idle in transaction, idle in transaction (aborted) or disabled.
  • A connection is considered old if its state stayed the same during more than 5 minutes.

If the pg_cancel_backend command does not terminate the query, we can escalate to a more forceful termination by executing the following command:

SELECT pg_terminate_backend(<PID>);

WITH inactive_connections AS (
    SELECT
        pid,
        rank() over (partition by client_addr order by backend_start ASC) as rank
    FROM 
        pg_stat_activity
    WHERE
        -- Exclude the thread owned connection (ie no auto-kill)
        pid <> pg_backend_pid( )
    AND
        -- Exclude known applications connections
        application_name !~ '(?:psql)|(?:pgAdmin.+)'
    AND
        -- Include connections to the same database the thread is connected to
        datname = current_database() 
    AND
        -- Include connections using the same thread username connection
        usename = current_user 
    AND
        -- Include inactive connections only
        state in ('idle', 'idle in transaction', 'idle in transaction (aborted)', 'disabled') 
    AND
        -- Include old connections (found with the state_change field)
        current_timestamp - state_change > interval '5 minutes' 
)
SELECT
    pg_terminate_backend(pid)
FROM
    inactive_connections 
WHERE
    rank > 1 -- Leave one connection for each application connected to the database
  1. idle_in_transaction_session_timeout This will only close connections that opened a transaction and failed to close (commit or rollback) it within the given timeout (as the name "idle_in_transaction_session_timeout" suggests). It won't close connections that are just "idle"
alter system set idle_in_transaction_session_timeout='5min';

To disable the feature,

alter system set idle_in_transaction_session_timeout=0;

or

SET SESSION idle_in_transaction_session_timeout = 0;

show idle_in_transaction_session_timeout;
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