Check Data Values, Generates Navigation Data steps taking more time

Hi,

In the Masterdata load to 0MAT_PLANT

The step - "Updating attributes for InfoObject 0MAT_PLANT" used to take a Maximum if 23 minutes for a data package size of 100,000 records till three days ago with the constituent steps "Check Data Values","Process Time-Independent Attributes" and "Generates Navigation Data" taking 5,4 and 12 minutes respectively.

For the last three days the step "Updating attributes for InfoObject 0MAT_PLANT" is taking 58-60 minutes for the same for data package size of 100,000 records with the constituent steps "Check Data Values","Process Time-Independent Attributes" and "Generates Navigation Data" taking 12,14 and 22 minutes respectively.

Can anyone please explain what is needed to speeden the dataload back to its previous timing e.g. if tables indexes need to built for 'P' or 'SID' table of Mat_plant.

An explanation of why the delay could be happening in the above steps will be really great.

regards,

Kulmohan