Help with Blast and nr database

[GenoMax]

Are you interested in blasting your contigs against the preformatted "nr" database?

If that is correct then have a look at this link: http://www.ncbi.nlm.nih.gov/books/NBK1763/

[Avila]

Hello.

I have a list of contigs that I would like them Blast on my computer (BioLinux 6), my question is how to use the nr database (preformatted, nr.00.tar.gz ... nr.06.tar.gz) I decompressed tar xzvf files, creating files with extension. phd. phi. phr. pin. pnd. pni. pog. ppi. psd. psi. psq But not to do with them, I found the following with formatdb:

"Please note that formatdb does not create non-redundant blast databases"

That means you can run blastall as are the files or format it with another program and not formatdb?

Thanks