.TH MAP_DB "September, 1999"
.SH NAME
.B map_db
\- read a FASTA (0), GENBANK flat file (1) PIR/VMS (5) or GCG binary
(6) sequence database and produce the offsets necessary for efficient
memory mapping.
.SH SYNOPSIS
.B map_db
[-n] filename | "filename libtype"
.SH DESCRIPTION
.B map_db
.I filename
reads the sequence database in
.I filename
and produce a new file
.I filename.xin
with the offset information necessary for efficient memory mapping.
.LP
The programs in fasta version 32t08 can use memory mapped i/o to load
sequence database files and read them efficiently.  Memory mapping is
used only if a "\c
.I .xin\c
\&" file is available.  The "\c
.I .xin\c
\&" file is created by
.B map_db\c
\&.
.LP
In addition to
.B map_db\c
\&,
.B list_db
is available to display the database size, etc, and set of offsets calculated
by
.B map_db\c
\&.
.SH OPTIONS
.TP
\-n 
Read file as DNA database.
.SH BUGS
.SH AUTHOR
Bill Pearson
.br
wrp@virginia.EDU