Without knowing which driver you are using, most certainly not. The way you are doing it duplicates data - you are using bind variables and you are using fetchall_arrayref. Furthermore, you first fetch every row in a big table, then you loop over it (in a, IMO, weird way) and slightly rearrange it. You're doing quite a lot of data duplications, even before you do anything with the data.

First you have to answer the question: do I need all 100000 rows before I do any processing? Or do you want to process each row? In which case you're (probably) better off fetching a row at the time, doing the processing, then fetching the next. Note I say probably - if the processing takes a long time, you are holding resources (perhaps even locks) in the database which may influence other processes accessing the data.

AFAIK, bind variables and fetchrow_arrayref are the fastests way to retrieve data - with bind variables probably the fastest (but I haven't benchmarked it myself, and it may vary between drivers). I never use bind variables, as I don't like its action at a distance, but if fetching was the bottleneck of a time critical program, I'd certainly look into it.

In reply to Re: fastest method to use DBI by JavaFan
in thread fastest method to use DBI by Anonymous Monk

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.