RAISERROR’s severity levels are defined in the Sql Server Books On Line, and give vague guidance about which severity level is best. The short and sweet is as follows:
- below 11 are warnings, not errors
- 11-16 are available for use
- above 16 are system errors
- there is no behavioral difference among 11-16
The best thing to do is just get everyone to use the same value and reduce confusion. It may be useful to use different values, to signal a desired behavior to the code that catches the error. In this case, a company standard or policy is in order. Also, keep in mind even though you may not use severities this way now, you very well might someday — in which case, you’ll be happy you started using them consistently now.
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