Biggest mistake you've ever made

Posted by Rogue Coder on Programmers See other posts from Programmers or by Rogue Coder
Published on 2010-10-25T00:02:30Z Indexed on 2011/01/13 19:58 UTC
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Similar to the question I read on Server Fault, what is the biggest mistake you've ever made in an IT related position. Some examples from friends:

I needed to do some work on a production site so I decided to copy over the live database to the beta site. Pretty standard, but when I went to the beta site it was still pulling out-of-date info. OOPS! I had copied the beta database over to the live site! Thank god for backups.

And for me, I created a form for an event that was to be held during a specific time range. Participants would fill out the form for a chance to win, and we would send the event organizers a CSV from the database. I went into the database, and found ONLY 1 ENTRY, MINE. Upon investigating, it appears as though I forgot an auto increment key, and because of the server setup there was no way to recover the lost data.

I am aware this question is similar to ones on Stack Overflow but the ones I found seemed to receive generic answers instead of actual stories :)

What is the biggest coding error/mistake ever…

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