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PostgreSQL 9 Administration Cookbook by Hannu Krosing, Simon Riggs

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Restricting users to just one session each

If resources need to be closely controlled, you may wish to restrict users so that they can only connect at most once to the server. The same technique can be used to prevent connections entirely for that user.

How to do it...

We can restrict users to just one connection by using the following command:

postgres=# ALTER ROLE fred CONNECTION LIMIT 1;
ALTER ROLE

This will then cause any additional connections to receive the error message:

FATAL: too many connections for role "fred".

Note

You can eliminate this restriction by setting the value to -1.

It's possible to set the limit to zero or any positive integer. You can set this to a number other than max_connections, though it is up to you to make sense of ...

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