I understand there are plenty of factors to consider when sizing Tempdb. But is there a recommendation from Microsoft for configuring initial size of Tempdb. I mean, like 25% of data drive or something like that ? In one of our servers Data drive is 500 GB (data size is 450 GB), Log drive is 150 GB but Tempdb is sized 25 GB. I wanted some microsoft's recommendation for deciding on the initial size of Tempdb.