How to set statement timeout per user?

Question

I have multiple users in Postgres. I would like to set up different statement timeouts for different users.
Eg: Guest 5 minutes and Admin 10 minutes.

Is it possible in Postgres 11.11?

Answer 1

Yes, Postgres allows settings per user or even per database and user, including statement_timeout:

ALTER ROLE foo SET statement_timeout = 12345;  -- milliseconds

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To see the currently active setting for the session:

SHOW statement_timeout;

Or get more details from the view pg_settings (including how it was set):

SELECT *
FROM   pg_settings
WHERE  name = 'statement_timeout';

To check current settings for a role:

SELECT rolname, rolconfig
FROM   pg_roles
WHERE  rolname = 'foo';

rolconfig is an array, unnest it to get one setting per row:

SELECT rolname, unnest(rolconfig) AS setting
FROM   pg_roles
WHERE  rolname = 'foo';

Answer 2

Found that we can set the timeout on Role.

ALTER ROLE guest SET statement_timeout='5min';
ALTER ROLE admin SET statement_timeout='10min';