Timeout In Postgres

1.idle_in_transaction_session_timeout

Determines the maximum time a session can remain idle inside a transaction before it is automatically terminated. Helps prevent long-running transactions from tying up resources.

SET idle_in_transaction_session_timeout = 60000; -- 60 seconds

Concerned with the overall duration of inactivity within a transaction.

2. statement_timeout

Sets the maximum allowed time for the execution of individual SQL statements. If a statement takes longer than the specified timeout, it is automatically canceled.

SET statement_timeout = 5000; -- 5 seconds

Focuses on limiting the execution time of individual SQL statements.

3. lock_timeout

Sets the maximum allowed time to wait for a lock to be acquired. If a lock cannot be acquired within the specified timeout, the statement is canceled.

SET lock_timeout = '10s'; -- 10 seconds

Determines the time a statement can wait for a lock to be acquired.

4. tcp_keepalives_idle, tcp_keepalives_interval, tcp_keepalives_count

Configures TCP keepalive settings to detect and terminate idle connections at the TCP level.

SET tcp_keepalives_idle = 600;      -- 10 minutes
SET tcp_keepalives_interval = 60;   -- 1 minute
SET tcp_keepalives_count = 5;

Operates at the TCP level, detecting and terminating idle connections.

Testing the Variables:

To test these variables, you can perform the following steps:

idle_in_transaction_session_timeout:

Open a transaction and remain idle for longer than the specified timeout. Observe that the session is terminated due to inactivity within the transaction.

statement_timeout:

Execute a query that takes longer than the specified timeout. Observe that the query is automatically canceled.

lock_timeout:

Attempt to acquire a lock that is held by another transaction for longer than the specified timeout. Observe that the statement attempting to acquire the lock is canceled.

tcp_keepalives_idle

tcp_keepalives_interval

tcp_keepalives_count:

Adjust these settings to configure TCP keepalives. Monitor network connections and observe how idle connections are handled. Review the impact of these settings in a controlled environment before applying them in a production setting. Testing should involve various scenarios to ensure that the configured timeouts meet the requirements of your application without causing disruptions.