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Extract data from large file 80+ million records

 
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Old 06-02-2009
Extract data from large file 80+ million records
Hello,

I have got one file with more than 120+ million records(35 GB in size). I have to extract some relevant data from file based on some parameter and generate other output file.

What will be the besat and fastest way to extract the ne file.

sample file format :--
++++++7777jjjjjjj0000000000 ( header record)
2098 POCG 0000 KKKK
2097 KOLL 0F00 KLLL
2095 LKJH 0L99 L0IU
.
.
.
.

********66666666666**** ( trailer record

Now suppose i enter the key as 2098(field as key) , so all rercords with 2098 as the first record should be moved to new file.

**********************************************

I tried to use grep ...but it took a lot of time ..nearly 45 mintues to give me output file.
 
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LEARN ABOUT DEBIAN

dbswiss

DBSWISS(1)							   User Commands							DBSWISS(1)

NAME

       dbSwiss - create DBM version of Swiss-Prot data

SYNOPSIS

       /usr/share/librg-utils-perl/dbSwiss [OPTIONS]

       /usr/share/librg-utils-perl/dbSwiss --datadir /data/swissprot --infile /data/swissprot/uniprot_sprot.dat

       /usr/share/librg-utils-perl/dbSwiss [--help] [--man]

DESCRIPTION

       dbSwiss creates DBM version of Swiss-Prot data.	This procedure is to replace splitSwiss.pl.  splitSwiss.pl saves Swiss-Prot records in
       separate files resulting in over 13 million relatively tiny files that take very long to create and rsync.  dbSwiss instead saves each
       record into a DBM database that is optimized for fast retrieval.

OPTIONS

       -d, --datadir=path
	   directory of database files, default: '/mnt/project/rost_db/data/swissprot'

       --debug
       --nodebug
       --first20
       --nofirst20
	   process only first 20 records, for debugging

       --help
       -i, --infile=path
	   Swiss-Prot data flatfile, default: '/mnt/project/rost_db/data/swissprot/uniprot_sprot.dat'.

       --man
       --quiet
       --noquiet
	   do not print progress status

       --readback
       --noreadback
	   read records back after storing and print them

       --table
	   name of database table and consequently the base name of database files, default: 'dbswiss'

       --version
       -w, --workdir=path
	   Optional working directory. Automatically created and removed if not defined.

AUTHOR

       Laszlo Kajan <lkajan@rostlab.org>

1.0.43								    2011-11-28								DBSWISS(1)