Very Computer

1. How to convert flat file database to dbm databases

I have the flat file database for people's beeper numbers and email
addresses:

Current I simply search the "key", and if it is a "user key",
then I simply get the "values": beeperid and email address,
and then send page or/and email according to options. And if it is
an "alias key", then I further expand the value to beeperid's.
This is done in Perl.

As the file grow, performance is an issue. So I would like to convert
to dbm and change the program accordingly. What is the best way to
do this? "dbm" files contain only a pair. So I have to create
three user dbm databases, and three alias dbm databases like:
user -> Beeperid
user -> Real Name
user -> Email

alias -> Beeperid
alias -> Real Name
alias -> Email

Then I query different databases to have everything resolved? If this
what I need to do, what is the tool that I can use. I find that
makedbm in Solaris deos not work with dbm_fetch as shown below:

#include <ndbm.h>
#include <stdio.h>
#include <fcntl.h>

#define NAME    "a"
#define DB_NAME "db"

main()
{
DBM *db;
datum name = {NAME, sizeof (NAME)};
datum val;

db = dbm_open(DB_NAME, O_RDONLY, 0600);
val = dbm_fetch(db, name);
(void) printf("Name: %s, Value: %s\n", name.dptr, val.dptr);
dbm_close(db);
return (0);
[pizza:/export/home/root/C]gcc query_dbm.c
[pizza:/export/home/root/C]echo a b | makedbm - db
[pizza:/export/home/root/C]./a.out                
Segmentation Fault(coredump)
--
Michael Wang
http://www.mindspring.com/~mwang

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