Dbm library

ruby-talk
1

I am using Ruby 1.8.2 on Windows and am wanting to use the dbm library
but cannot seem to find it anywhere. Can anyone please tell me where I
can find this package?

2

it comes with ruby.

   harp:~ > ruby -r dbm -e' p DBM '
   DBM

-a

···

On Fri, 3 Nov 2006, PWR wrote:

I am using Ruby 1.8.2 on Windows and am wanting to use the dbm library
but cannot seem to find it anywhere. Can anyone please tell me where I
can find this package?

--
my religion is very simple. my religion is kindness. -- the dalai lama

3

With ruby 1.8.5, there is no DBM on windows, it's SDBM or GDBM.

···

On 11/2/06, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:

On Fri, 3 Nov 2006, PWR wrote:

> I am using Ruby 1.8.2 on Windows and am wanting to use the dbm library
> but cannot seem to find it anywhere. Can anyone please tell me where I
> can find this package?

it comes with ruby.

   harp:~ > ruby -r dbm -e' p DBM '
   DBM

4

snacktime wrote:

···

On 11/2/06, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
> On Fri, 3 Nov 2006, PWR wrote:
>
> > I am using Ruby 1.8.2 on Windows and am wanting to use the dbm library
> > but cannot seem to find it anywhere. Can anyone please tell me where I
> > can find this package?
>
> it comes with ruby.
>
> harp:~ > ruby -r dbm -e' p DBM '
> DBM

With ruby 1.8.5, there is no DBM on windows, it's SDBM or GDBM.

Thanks, that's solved it. I am now using SDBM.

5

snacktime wrote:

>
> > I am using Ruby 1.8.2 on Windows and am wanting to use the dbm library
> > but cannot seem to find it anywhere. Can anyone please tell me where I
> > can find this package?
>
> it comes with ruby.
>
> harp:~ > ruby -r dbm -e' p DBM '
> DBM

With ruby 1.8.5, there is no DBM on windows, it's SDBM or GDBM.

Thanks, that's solved it. I am now using SDBM.

Warning, unless something's changed since I last tried SDBM
on Windows a few years ago... It has some severe limitations.

(It wasn't a Ruby problem, Perl uses the same SDBM library and
exhibits the same issues.)

For ex... This test program tries to write a million key/values
to an SDBM store, where the key length is 8 bytes, and the
value ranges from 1..512 bytes:

require 'sdbm'

k = 12345678

SDBM.open("test.dbm") do |dbm|
  1000.times {|iter|
    1000.times {
      dbm[k.to_s] = "v" * (rand(511) + 1)
      k += 1
    }
    print "#{iter} "
  }
end

On my system (win xp pro, NTFS) it only makes it to around
40,000 to 50,000 keys before blowing up with:
dbmtest.rb:9:in `=': sdbm_store failed (SDBMError)

And the .pag file size has bloated up to 1.7 to 2.1 gigs at
the point it dies.

Anyway, just FYI... if you program needs to store a lot of
key/values, SDBM may not be able to handle it...

Regards,

Bill

···

From: "PWR" <pw_richards@fastmail.fm>

On 11/2/06, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
> On Fri, 3 Nov 2006, PWR wrote: