[mrsernine]

That time I had to update the users table so users belonging to 'department A' should now belong to 'department B'. I wrote that really simple update sentence and even diligently tested it on one of the pre-production servers. Then I copied & pasted it into the production console just to notice that I hadn't copied the WHERE clause of the sentence and now all of the users belonged to the same department.

The fix was not painful, just restore de user table from last night's backup. but I felt a little ashamed when i had to explain the database administrator what has happened.

From that day, I keep autocommit always off.