51. What are the techniques involved in using SAP supplied programs? Do you  prefer to write your own programs to load master data? Why? 
Ans. 



   
52. What are logical databases? What are the advantages/disadvantages of  logical databases? 
Ans. Logical database are special ABAP programs that retrive data & make it  available  to application programs. 
Advantages of Logical database.
•	 No need of taking care of the key field and the foreign key realtionship between the tables in question.(relationship between diff tables are reflected in tree structure of Logical database).
•	A selection screen with appropriate selection criteria is automatically created.
•	Program standard authority checks are executed by Logical database itself in reports.
•	Logical database  improves the performance of reports at runtime.





53. What specific statements do you using when writing a drill down report?
 Ans.  Hide stmt.

54. What are different tools to report data in SAP? What all have you used?
  Ans. ABAP query tool, 

55. What are the advantages and disadvantages of ABAP query tool? 
Ans. 








56. What are the functional areas? User groups? and how does ABAP query work in relation to these? 
Ans.





57. Is a logical database a requirement/must to write an ABAP query?
 Ans. No.

58. What is the structure of a BDC sessions. 
Ans. 
•	        Declare internal tables for upload.
•	        declare another internal table with same structure of BDCDATA.
•	        call function BDC_Open _group.
•	        call function BDC_insert.
•	        call function BDC_close_group.

59. What are Change header/detail tables? Have you used them? 
Ans. The change header contains both fields that define and describe the change and administrative data on the change master. The administrative data is updated by the system.

60. What do you do when the system crashes in the middle of a BDC  batch  session? 
Ans.