What is the best time to validate this?

I'm creating a standard form which asks the user for personal data (name, age, address, and so on...).
At the end of this form the user must enter a User Name for his/her account.
Since validating the user name requires the server to connect to the database and check wheter that name already exists or not, I'd like to do this verification only when all the other fields in the form are valid. This will reduce accesses to the DB.
Think about connecting to the DB even when the user fails entering a valid age or other data. It seems pretty inefficient.
What is the best way to achieve this check?
I was thinking to create a backing bean which includes all the fields in the form, and which validates the user name field only if every single other field is valid... but I guess that's not how it should be done.
Any idea? Please help.
Thank you!

That's what I do...
The problem is: I want the other fields to be validated by their validators (and that what happens). But I want the user name to be validated only if all the other fields are valid (i.e. previously validated and accepted), otherwise no validation occours on the user name fields (except for the "needed" one)
Is that possible?
I'm doing it with a big Backing Bean which embodies the whole form and checks whether the other fileds are valid or not before validating the User Name.

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What is the best time to validate this?

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