@lakshmi_narayanan_t 

Data Rules :Gathers details about data as it passes between two stages. 

E.g : ${record:value(‘/Manger’) == NULL or ${record:value(‘/average_age’) < 10

Alert name (Employees having manager field null or Employees are below age limit) .

Data Drift : 

It determines changes in the data size,number ,count etc.

e,g if column name changes in DB table or number of column reduced , then data drift will generate error.

CASE 1:

• Label: field name change

• Condition: ${drift:names('/',false)}

• Sampling Percentage: 100

• Check  the Enable Meter option

Alert Text: there is a field name change(s) in the related source

CASE 2 :

• Label: drift size

• Condition: ${ drift:size('/',false)}

• Sampling Percentage: 100

• Check  the Enable Meter option

Alert Text: ${ alert:info()}