If you check out the articles I reference you will see the reason(s) why. Mainly because the log grew to that size for a reason so it will likely grow there again, and growth is an expensive operation.
If you are doing it in a test/development environment it is probably okay, but should really never (or very rarely) be done in a production environment. You had not mentioned that this was for a test environment.
Jack Corbett
Consultant - Straight Path Solutions
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