Where is a database shape in Visio?
I think the user was asking about finding a database stencil, rather than looking to generate a Visio document for an existing database.
If that is correct, I believe the desired shape can be found under:
File -> Shapes -> Flowchart -> Miscellaneous Flowchart Shapes
Source: https://web.archive.org/web/20120121234844/http://www.workplacelife.com/2006/04/11/creating-flowcharts-using-common-visio-shapes
P.S. Sorry for posting to an old thread, but Google brought me here with a similar question and, once I found the answer, I thought I would share.
Which version do you have? Because it's not included in all version.
Standard : This edition does not include the Database Model Diagram template.
Professional: This edition supports the reverse engineering features for the Database Model Diagram template (that is, using an existing database to create a model in Visio) but does not support forward engineering (that is, using a Visio database model to generate SQL code).
Enterprise Architect: This edition, which is included in Microsoft Visual Studio .NET 2003 Enterprise Architect, supports the full suite of database modeling features, including both reverse engineering and forward engineering.
Source
On Visio 2010, there is a Database relational shape in Network - Network Symbols. In italian, Altre forme - Rete - Simboli Rete . There is a Database relational shape that is perfect.