In reply to your first comment, yes it does involve an SQL transaction. It connects to the database, prepares a query, executes it, fetches rows in turn in a while loop, and then at the end disconnects and finishes. You mention a lock, I was not aware about any form of lock (as I said I am a complete novice). So, could it be that because the database connection and query is closed only at the end of the file, the next process needs to wait until the previous query is completed.. So with that knowledge, would it speed things up to do the query at the start of the script, load the response into an array, close the query and connection and then loop through the array?

In reply to Re^2: Perl concurrent access by TienLung
in thread Perl concurrent access by TienLung

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.