kraken --db MY_DB MYSEQ.fasta (where MY_SEQ.fasta is one sequnce which I downloaded from ncbi, and MY_DB is the downloaded database) Hi everybody, After downloading kraken's database wihth "kraken-build" command, I typed the command:
kraken --db MY_DB MYSEQ.fasta (where MY_SEQ.fasta is one sequnce which I downloaded from ncbi, and MY_DB is the downloaded database)
But I received this error: MY_DB/database.kdb does not exist!
As I read in kraken's mannual, there should be 4 part in every database : database.kdb: Contains the k-mer to taxon mappings database.idx: Contains minimizer offset locations in database.kdb taxonomy/nodes.dmp: Taxonomy tree structure + ranks taxonomy/names.dmp: Taxonomy names
But in the downloaded db, I dont have all of them, and all things that I have are: A librarary folder, containing abouat 2000 subfolders containing nodes.dmp and names.dmp
And a taxonomy folder containing names.dmp and nodes.dmp
can anybody help me plz?