Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Is there a way to call time() with an increment smaller than seconds?

by BBQ (Deacon)
on Apr 23, 2000 at 05:15 UTC ( #8643=categorized question: print w/replies, xml ) Need Help??
Contributed by BBQ on Apr 23, 2000 at 05:15 UTC
Q&A  > dates and times


For a long time I've used time() as a primary key on small databases just to keep track of records' ages. The problem is: what do I do if I have more than 1 transaction per second? Is there any perlfunc that will let me get less than a full second reply?

Answer: time() smaller than seconds?
contributed by turnstep

It's probably easier to just add something else to your primary key than to try and get sub-second responses. A good example is to use:

$mykey = "$^T$$";
which sets the key to a combination of the time in seconds and the process ID. This combination will be unique, as long as each time the script is run it generates a single key (e.g. a web script). If the script generates more than one key per second, add a counter:
$mykey = "$^T$$" . $x++;

If you do need sub-second times, you can look at the Time::HiRes module, although it may not work on your system, as it uses syscall and gettimeofday(2) in C. Probably easier overall to use the technique above.

Please (register and) log in if you wish to add an answer

  • 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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others exploiting the Monastery: (7)
    As of 2020-09-29 20:23 GMT
    Find Nodes?
      Voting Booth?
      If at first I donít succeed, I Ö

      Results (153 votes). Check out past polls.