When Data will be stored in Calculated series

Hi All,

I have thress series a,b and c, and corresponding column in sales_data are a, b and c.

c=a*b is the server expression.

some times, c is not able to c in thw worksheet, even a and b values are present.

a and b are existing series and c is newly created series. some times it is observed a and b  series has values and c is not calculated properly and showing as 0

I have two questions here.

1) when i create series c first time, will bounce the server. and open the worksheet to see the value of c againest a and b.  when values are stored in the c column of sales_data table. Is it after bounce or when i open the worksheet.