PostgreSQL - Rename database

I need to rename the database but when I do in PGAdmin : ALTER DATABASE "databaseName" RENAME TO "databaseNameOld" it told me that it cannot.

How can I do it?

(Version 8.3 on WindowsXP)

Update

The first error message : Cannot because I was connect to it. So I selected an other database and did the queries.
I get a second error message telling me that it has come user connect. I see in the PGAdmin screen that it has many PID but they are inactive... I do not see how to kill them.

Solution 1:

Try not quoting the database name:

ALTER DATABASE people RENAME TO customers;

Also ensure that there are no other clients connected to the database at the time. Lastly, try posting the error message it returns so we can get a bit more information.

Solution 2:

For future reference, you should be able to:

-- disconnect from the database to be renamed
\c postgres

-- force disconnect all other clients from the database to be renamed
SELECT pg_terminate_backend( pid )
FROM pg_stat_activity
WHERE pid <> pg_backend_pid( )
    AND datname = 'name of database';

-- rename the database (it should now have zero clients)
ALTER DATABASE "name of database" RENAME TO "new name of database";

Note that table pg_stat_activity column pid was named as procpid in versions prior to 9.2. So if your PostgreSQL version is lower than 9.2, use procpid instead of pid.

Solution 3:

I just ran into this and below is what worked:

1) pgAdmin is one of the sessions. Use psql instead.
2) Stop the pgBouncer and/or scheduler services on Windows as these also create sessions

Solution 4:

Unexist told me in comment to restart the database and it works! Restarting the database kill all existing connection and then I connect to an other database and was able to rename it with my initial query.

Thx all.

Solution 5:

Instead of deploying a nuke (restarting the server) you should try to close those connections that bother you either by finding where are they from and shutting down the client processes or by using the pg_cancel_backend() function.