<p>my question is similar to other friend posted here...we are trying to develop an application that supports possibly terabytes of information based on a land registry in Paraguay with images and normal data.</p>

<p>The problem is that we want to reduce the cost of operation to  minimum as possible because it´s like a competition between companies, and for that reason we want to use a free database....I have read a lot of information about it but I am still confused. We have to realize that the people who is gonna use it are government people so the DB has to be easy to manage at the same time.</p>

<p>What would u people recommend me?</p>

<p>Thanu very much</p>

Postgresql
,
SQL Server 2008
and
Any recent version of Oracle
all have spatial indexing, table partitioning and BLOBs and are capable of acting as the back-end of a large geographic database.  You might also want to check out two open-source GIS applications:
GRASS
and
QGIS
, which might support doing what you want with less modification work than writing a bespoke application.  Both can use Postgresql and other database back-ends.
As for support, any commercial or open-source database is going to need the attentions of a competent DBA if you want to get it to work well on terabyte-size databases.  I don't think you will get away with a model of pure end-user support - attempts to do this are unlikely to work.