number of histogram steps specifies the number of steps in a histogram.
| 
                 Summary Information  | 
|
|---|---|
| 
                 Default value  | 
                 20  | 
| 
                 Range of values  | 
                 3 – 2147483647  | 
| 
                 Status  | 
                 Dynamic  | 
| 
                 Display level  | 
                 Comprehensive  | 
| 
                 Required role  | 
                 System administrator  | 
| 
                 Configuration group  | 
                 Query Tuning  |