Yes, there are some simple joins already, but I'd have to replace, for example:
delete from testDBRepCats where repCatID = ?

[download]
with something like: 
delete r.* from testDBRepCats r, testDBToMCQDB m, testDB t, clients c 
+where r.repCatID = m.repCatID and m.testDigest = t.testDigest and t.c
+lientID = c.clientID and c.drone != '$drone'

[download]
(not checked for validity)
except that's much more complex to chunk (for time-out purposes), because just adding limit 1000 won't maintain data integrity the way the current approach does -- I'm processing 1000 tests at a time, but all the data for those tests is removed before I check time and move to the next chunk, so I'm left with something like: 
delete r.* from testDBRepCats r, testDBToMCQDB m, testDB t, clients c 
+where r.repCatID = m.repCatID and m.testDigest = t.testDigest and t.t
+estDigest = ?

[download]
passed to execute_array(), which may or may not be any gain over the current approach, since it's a more complex statement, involving a lot more tables.

In reply to Re^2: Slow script: DBI, MySQL, or just too much data? by menolly
in thread Slow script: DBI, MySQL, or just too much data? by menolly

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.