I have downloaded the complete nr datadase to my local server. I have now a list of nr.00* to nr.38*

    nr.00.phd
    nr.00.phi
    nr.00.phr
    nr.00.pin
    nr.00.pog
    nr.00.ppd
    nr.00.ppi
    nr.00.psq
    nr.00.tar.gz.md5
    nr.01.phd
    ...
    nr.38.ppd
    nr.38.ppi
    nr.38.psq
    nr.38.tar.gz.md5
    nr.pal
    nr.pdb
    nr.pos
    nr.pot
    nr.ptf
    nr.pto
    taxdb.btd
    taxdb.bti


I would like now to run `magicblast` against this local data base, but I keep getting the error massage, I don't have an index file.This is the command I am trying to run:

    $magicblast -query R2_val_2.tagged_filter.fastq.gz  -db /home/BLASTdb/nr -infmt fastq -outfmt tabular -num_threads 5 -out WK56.R2.unmapped.magicblast.nr.txt 

I am getting this error

    BLAST Database error: No alias or index file found for nucleotide database [/home/BLASTdb/nr] in search path [/local/projects/Chad/P286::]

Can someone tell me what I am doing wrong?
Do I need to somehow combine these files?

thanks
yes it does.

my command was as such

    magicblast -query  tagged_filter.fastq.gz  -db BLASTdb/nt/nt -infmt fastq -outfmt tabular -num_threads 5 -out unmapped.magicblast.nt.txt

while the folder with the data base is as such

    $ ls -1 BLASTdb/nt
    nt.00.nhd
    nt.00.nhi
    nt.00.nhr
    nt.00.nin
    nt.00.nnd
    nt.00.nni
    nt.00.nog
    nt.00.nsq
    nt.00.tar.gz.md5
    nt.01.nhd
    nt.01.nhi
    ...
    nt.27.tar.gz.md5
    nt.nal
    nt.ndb
    nt.nos
    nt.not
    nt.ntf
    nt.nto
    taxdb.btd
    taxdb.bti