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

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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.

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