Update script fails due to Service capacity

I am trying to update the core of my Drupal site. I neglected updates for some time and the update script had 19 updates pending. Apperently the update script tries to do all of this in one go, and fails miserably. I get an error message like this:

StatusText: Service Unavailable ResponseText: 503 Service Unavailable Service  Unavailable The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. 

and this one:

An AJAX HTTP error occurred. HTTP Result Code: 503 Debugging information follows. Path: h t t p ://mysite.com/update.php?op=selection&token=7R0M7yvUZR09UsRDFf9FUAYhV9Ui82efUzsZPh61JZU&id=152&op=do StatusText: Service Unavailable ResponseText: 503 Service Unavailable Service Unavailable The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

I have the following questions:

  • Has anyone seen this one before? If so how do I solve it?
  • If not, can I run the other 18 pending updates somehow?
  • If not, how harmfull is it if I don’t run update.php?
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Update script fails due to Service capacity

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