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File Exit, Menu Exit, Function Exit.

CMOD : This transaction allows you to create a PROJECT by identifying its ENHANCEMENT(S). After determining all of the ENHANCEMENTS that are part of the PROJECT, you will have to activate the PROJECT. You will still need to code your user-exit; therefore, you may want to wait until this step is completed before activating the PROJECT. §SMOD : This transaction allows you to create an ENHANCEMENT, which you will include in a PROJECT, by identifying its COMPONENT(S). In the case where SAP has already created an ENHANCEMENT for its pre-defined user-exits, you will not need to use transaction SMOD; instead, you should just use transaction CMOD.

Yes, We can use TC SE93 for creating our own transaction code.

Table controls are modified / mproved versions of step loops. in controls we can do, horizontal scrolling, vertical scrolling, scrolling in a perticular field, resize the table, can save the settings for future use, can make selective columns editable,....etc these things are not possible with step loops. step loops are controlled by loop-endloop statements.

In an Interactive Report, user can define maximum 20 secondary lists.

UNPACK field1TO field2 .Unpacks the packed field field1 and places it in the field field2 with leading zeros. If field2 is too short, it is truncated on the left.

Available Dictionary Objects are Domains, Viwes, Match Codes, Lock Objects, Structures, Data Elements, Intenal Types.

Transparent tables have 1 - 1 cardinality b/w Data Dictionary and Database, and non transparent ( Cluster and Pooled) tables have Many - 1 cardinality. Transparent table can access with using OPen & NAtive SQL stmts where as Nontransparent only OPen Sql. Transparent trables can store Table relevent data and non transparent tables can store system data/ application data based on the transparent tables

BDC -> BATCH DATA COMMUNICATION. METHODS OF BDC-> Direct Input method, Batch Input Session method, Call transaction method.

1. Function modules use a special screen to define the parameters where as subroutines use the same ABAP/4 editor to define its parameters.
2. Tables work area can be commonly shared by calling program and subroutine where as function modules do not share commonly.
3. Calling a function module syntax (Call function.) is different from calling a subroutine syntax (perform….).
4. With raise statement user can exit from a function module where as exit is used in subroutines.

ALE: application linking enabling IDOC: intermediatary documents EDI: electronic data interchange RFC: remote function call

SQL Tracer is a tool used to measure the performance of ABAP program. T.code :st05

YES, open dataset for output. read dataset from itab. close dataset .

sm30 is used to view the ' Call Up View Maintenance ' and SM31 is to view the ' Table maintenance '

Function modules is a extranal subroutine.we can call it to outside the program.its a mini program. its used for redues the coding,easy to find error.

"CAT" Computer Aided Test Tool. Used to create test cases for application testing purposes.

Logical Database is an ABAP program which retrieves data from various tables Which are interrelated and provides a read only view of the data.

Classical Report Events are LOAD OF PROGRAM.INITIALIZATION. AT SELECTION-SCREEN.START-OF-SELECTION. TOP-OF-PAGE.END-OF-PAGE. END-OF-SELECTION. Interactive events are AT LINE-SELECTION. AT USER-COMMAND. TOP-OF-PAGE DURING LINE-SELECTION. AT LINE-SELECTION:Allows the user to interact with the lists. AT USER-COMMAND:USed for handling Push buttons. SET PF-STATUS:Provides User Interface.

call transaction session method direct input method

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

- STANDARD TABLE: The key is, by default, set to NON-UNIQUE. You may not use the UNIQUE addition. - SORTED TABLE: 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 TABLE: Hashed tables have no default setting. You must use the UNIQUE addition with hashed tables. You may not use NON-UNIQUE.

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

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: - STANDARD 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. - SORTED TABLE: 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.

There are two ways to create table
1) top-down approach
2) bottom-up approach

Text elements makes program easier to maintain program texts in different languages. These are used for maintaining list headers,selection texts in programs