I'm not that used to postgress and don't fully understand the where clause in the first update:
UPDATE yeast1 set $tables[$_] = temp/$tables[$_-1] where yeast1.orf = 
+temp.orf;

[download]
Where does temp.orf come from. From a temoprary table?

If it does, you should have an index on that table on the column orf.

And you should have an index on yeast1(orf) anyway.

Try to benchmark the sql, AFAIK postgres has some tool show what's going on, when a query runs (explain or such).

In reply to Re: Perl DBI Performance by busunsl
in thread Perl DBI Performance by Evanovich

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.