I tried "fetch" (which is same as fetchrow_arrayref):
$dat->bind_columns(undef,\($row));
while($dat->fetch) {
print DATA "$row\n";
}
And it seems the performance improved a bit (about 5%). Using RowCacheSize
or not does not seem to matter. The size of the table can vary from 1 row to
1 million rows. So I won't use fetchall_arrayref.
Thanks for your help.
Guang
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of
> [EMAIL PROTECTED]
> Sent: Thursday, March 06, 2003 5:54 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: perl DBI question: fetchrow_array
>
>
> 1) fetchrow_arrayref is faster than fetchrow_array, as Alex has noted.
>
> 2) I see you've already set RowCacheSize. Anecdotal evidence
> ( not just
> mine)
> suggests that the diminished returns obtained by setting this
> >100 aren't
> worth it.
>
> 3) try selectall_arrayref if you're data is not really
> large. 'really
> large' depends
> on your environment.
>
> 4) join DBI users list, found at lists.perl.org.
>
> Jared
>
>
>
>
>
>
> Alex <[EMAIL PROTECTED]>
> Sent by: [EMAIL PROTECTED]
> 03/06/2003 01:34 PM
> Please respond to ORACLE-L
>
>
> To: Multiple recipients of list ORACLE-L
> <[EMAIL PROTECTED]>
> cc:
> Subject: Re: perl DBI question: fetchrow_array
>
>
> try using fetchrow_arrayref and see if its faster or less resource
> intensive.
>
>
>
> On Thu, 6 Mar 2003, gmei wrote:
>
> > I have some perl code which selects table data and write it
> into a file.
> I
> > have something like:
> >
> > -------
> > $dbh->{RowCacheSize} = 10000;
> > open(DATA, ">$tn") || die "Can't open file\n";
> > $dat=$dbh->prepare("select
> id||chr(9)||FUNCTIONID||chr(9)||GENEID from
> > FUNCTION2GENE");
> > $dat->execute();
> > while(($row) = $dat->fetchrow_array) {
> > print DATA "$row\n";
> > }
> > close(DATA);
> > -----
> >
> > I am trying to see if there is any way to speed up the process.
> >
> > So here is my question:
> >
> > Is "fetchrow_array" the fatest way to get the data?
> >
> > TIA.
> >
> > Guang
> >
> >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: gmei
> > INET: [EMAIL PROTECTED]
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Alex
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Author: gmei
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