Splitting TempDB into multiple data files.

To avoid contention we have to split tempdb into multiple data files. But as for case suppose, there is 20 GB total space is on the drive containing 1 tempdb data file of 15 GB. And I have to create 3 more tempdb data files, and as recommendation all files should be of same size.Then how to handle this situation and configure all data files with same size?

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Pranshul Gupta