Here are a couple tips that cause MANY people problems.
Do not delete issues. When you delete it is GONE. Hardly a week goes by without someone wanting to restore an issue. Deleting issues will come back and bite you when it is the most inconvenient. I suggest closing with a resolution value of Deleted anything you want to delete. I implement a special transition only the project lead can execute and it requires filling in a reason field from a select list (such as entered in error, OBE, Duplicate, Other) and explanation text.
. Missing issue numbers will eventually cause a question about what it was and why was it deleted even if it was done properly. Missing data always brings in the question of people hiding something that may have looked bad.
The only viable way to restore an issue is to create a new instance of JIRA and restore a backup that has the issues. Then export them to a csv file and import them to your production instance. You will lose the history.
Do not delete users
Users should be made inactive not deleted. JIRA uses a pointer to the user’s DB entry to display user information. If you delete a user when you open a JIRA issue the user worked on anywhere the user that would be displayed will cause a SQL error. Even if the user never logged on, if they were assigned a ticket the history of the ticket will get an error when you display it.
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