Set - 2

Question 11 :

What is ABAP Memory and SAP Memory?

Answer :

SAP memory is a memory area to which all main sessions within a SAPgui have access. You can use SAP memory either to pass data from one program to another within a session, or to pass data from one session to another. Application programs that use SAP memory must do so using SPA/GPA parameters .

ABAP memory is a memory area that all ABAP programs within the same internal session can access using the EXPORT and IMPORT statements. Data within this area remains intact during a whole sequence of program calls. To pass data to a program which you are calling, the data needs to be placed in ABAP memory before the call is made. The internal session of the called program then replaces that of the calling program. The program called can then read from the ABAP memory.

1. SAP memory is for cross-transaction Applications and ABAP/4 memory is transaction-specific.

2. The SAP memory, otherwise known as the global memory, is available to a user during the entire duration of a terminal session. Its contents are retained across transaction boundaries as well as external and internal sessions. The contents of the ABAP/4 memory are retained only during the lifetime of an external session. You can retain or pass data across internal sessions.

3. The SET PARAMETER and GET PARAMETER statements allow you to write to, or read from, the SAP memory. The EXPORT TO MEMORY and IMPORT FROM MEMORY statements allow you to write data to, or read data from, the ABAP memory.

Question 12 :

Explain Check Table and Value Table ?

Answer :

check tabke works at table level and value table works at domain level.
check table is nothing but master table that u will create with valid set of values.
value table it provides the list of values and it will automatically proposed as a check table while creating foreing key relationship

Question 13 :

How many types of Standard Internal Tables?

Answer :

The key is, by default, set to NON-UNIQUE. You may not use the UNIQUE addition.

Unlike stadard tables, sorted table have no default setting for the uniqueness attribute. If you do not specify either UNIQUE or NON-UNIQUE, the system defines a generic table type, where uniqueness is irrelevant. You can use generic types to specify the type of generic subroutine parameters.

Hashed tables have no default setting. You must use the UNIQUE addition with hashed tables. You may not use NON-UNIQUE.

Question 14 :

What is Refresh in Internal Table?

Answer :

'Refresh' is the keyworld which clears the contents of an internal table body.

Question 15 :

What is the Difference Between Collect and Sum?

Answer :

COLLECT allows you to create unique or summarized datasets. The system first tries to find a table entry corresponding to the table key. The key values are taken either from the header line of the internal table itab, or from the explicitly-specified work area.
If the system finds an entry, the numeric fields that are not part of the table key (see ABAP number types) are added to the sum total of the existing entries. If it does not find an entry, the system creates a new entry instead.
The way in which the system finds the entries depends on the type of the internal table:

The system creates a temporary hash administration for the table to find the entries. This means that the runtime required to find them does not depend on the number of table entries. The administration is temporary, since it is invalidated by operations like DELETE, INSERT, MODIFY, SORT, ...). A subsequent COLLECT is then no longer independent of the table size, because the system has to use a linear search to find entries. For this reason, you should only use COLLECT to fill standard tables.

The system uses a binary search to find the entries. There is a logarithmic relationship between the number of table entries and the search time.