Along with supporting any ERP system, it is important to understand the underlying database architecture. Odoo 8.0 requires Postgres 9.1 or later as the backend database. Here is a list of resources that can help you maintain your Postgres server.
While Odoo handles many of the complex database management tasks you would have with other ERP systems, there will be times when the official Postgres website will be useful in maintaining your Odoo installation, which is available at http://www.postgresql.org/.
The standard Postgres documentation will be useful when you need to perform operations on your Odoo database, which is available at http://www.postgresql.org/docs/9.3.