Hi sarnava,
Sorry for making my reply bit confusing.
The second point which i gave in my first reply was,
2. Try to avoid using more conditions in where clause as it creates load for database optimizer.
Please consider it as ,
Try to avoid " unwanted " comparison and other condition which could increase the fetching time.
And the point that i have mentioned above cannot be implemented everywhere , But try to use that if possible based on the input data we are getting.
Regarding the 6th point,
6.Try to avoid " into corresponding " clause if possible, Instead of this directly specify the the table or work area having similar structure as of selecting data.
Regards,
sajeesh