Data flow diagram


one of my client has developed an application with backend database as sqlserver2008 by an 3rd party .now he wants us to continue the development.we have zero knowledge on design of database how tables are realted  to each other.My query is,can we  use any tool or any method to identify the data flow .Kindly help us in this regards.

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Aneesh RetnakaranDatabase AdministratorCommented:
if you spend some time, then you can;  you can also try creating the sql server diagram (it will draw a perfect diagram if your client already has created the relationships ) . other than, you can spend time with your client for knowledge transfer.
Datadiagram represents the tables but it is not a dataflow-diagram.  If relations exist it can give you a starting idea of what you are dealing with.
Without relations you are looking for a system in the naming of tables and columns.

Next how it is used?
- views can tell you how to combine things (even when no relations exists)
- user defined functions on what it is used for , borders , .....
- stored procedures can give you realy an idea of a 'flow'

With dependencies you can work from a object to see where it is used

Next are
- sql agent jobs
- SSIS/SSAS- processes
- existing reports

How it is used? With the DMV's you can get a look at the most executed queries, the most excpensive  are things that give you at the most important or complex actions.

And with profiler trace (slows down your server!) you even can follow a process sql per sql ....

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Microsoft SQL Server 2008

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