What permissions does the health_check_user for pgpool-II need?

I'm confused about a point of pg_pool-II's documentation. The health_check_user is used to determine the health of DB cluster servers, but what abilities does the health_check_user need? As there are no configuration options to开发者_Go百科 get a password for this user, I'm assuming that pg-pool's health_check_user will likewise need trust level access to each DB?

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It looks like it just needs permission to connect to the databases (same username for all databases).

You don't need to rely on trust auth either, I'm sure you can use a .pgpass file. http://www.postgresql.org/docs/9.0/static/libpq-pgpass.html

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As Richard said, it only needs to connect to the database.

And also you can set password for this user with health_check_password