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					 The default value in seconds in the system variable ‘long_query_time’ is ______________.
 
- 
                        
- 60
 - 5
 - 10
 - 20
 - None of these
 
 
Correct Option: D
The server maintains a ‘long_query_time’ system variable that defines slow queries (10 seconds by default). If a query takes more than these seconds of real time it is considered slow.