Drupal Cron Run Failing and Timing Out

So I was trying to manually run cron.php on a drupal site, and it was timing out because the cron job couldn't finish. The cron job is quite intense, and I'm sure it isn't finishing because I am trying to run it during the day on a busy site. So in order to tell Drupal to forget about your last cron attempt:

  1. go into your drupal database
  2. go into the 'variable' table
  3. sort by the 'name' column ascending order
  4. look for any variable names beginning with 'cron_' and delete them

Here are some MySQL queries that should get the job done:

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