Configure PostgreSQL for ownCloud
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Before you can use PostgreSQL as database backend, you need to follow a couple of steps:

1. make sure that your PostgreSQL service is configured and running properly
2. log in to PostgreSQL as system user to create the database and a dedicated user account for ownCloud:
su - -c "psql" postgres
 CREATE USER username WITH PASSWORD 'password';
 CREATE DATABASE owncloud TEMPLATE template0 ENCODING 'UNICODE';
 ALTER DATABASE owncloud OWNER TO username;
 GRANT ALL PRIVILEGES ON DATABASE owncloud TO username;

Choose identifier and password accordingly.

Now you can launch the ownCloud setup screen, select PostgreSQL in the advanced settings and fill in your credentials.