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Get SQL Server uptime

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How long has SQL Server been running?

Since tempdb gets recreated every time SQL Server is restarted, it is a good way to figure out how long SQL Server has been up and running. You can use the crdate column in the sysdatabases table to get the creation date of tempdb.

The queries below will give you the time in different formats

  1. SELECT crdate [last startup datetime] FROM master.dbo.sysdatabases
  2. where name = 'tempdb'
  3.  
  4. SELECT DATEDIFF(hh, crdate, getdate()) AS [Uptime in Hours]
  5. FROM master.dbo.sysdatabases
  6. where name = 'tempdb'
  7.  
  8. SELECT DATEDIFF(dd, crdate, getdate()) AS [Uptime in Days]
  9. FROM master.dbo.sysdatabases
  10. where name = 'tempdb'
  11.  
  12. SELECT DATEDIFF(mm, crdate, getdate()) AS [Uptime in Months]
  13. FROM master.dbo.sysdatabases
  14. where name = 'tempdb'

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