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Question

1) what is the role of extended check in performance tinning?
2)difference between  inner joins and for all entries?
3)where we can find the standard logical databases?
4) how can we handle the screen resolution in bdc?
5)how can we handle the multiple values in bdc? write the logic?
6)how can we handle the pop up screen in bdc?
7)how can we call a report program in bdc?
8) in XL sheet i have 1000 records how can we upload?
9) how to call itab in scripts?
10) in single page how can we display some data in upper and some data in bottom?

Answer 1

Hi,
Please check these links
http://help.sap.com/saphelp_nw04/helpdata/en/cf/f2bbcb142c11d3b93a0000e8353423/content.htm
http://help.sap.com/saphelp_nw70/helpdata/en/d1/801afd454211d189710000e8322d00/content.htm
/people/rob.burbank/blog/2007/03/19/joins-vs-for-all-entries--which-performs-better
Inner Join
When multiple SAP tables are logically joined, it is always advisable to use inner join to read the data from them. This certainly reduces the load on the network.
Let us take an example of 2 tables, zairln and zflight. The table zairln has the field airln, which is the airline code and the field lnnam, which is the name of the airline. The table zflight has the field airln, the airline code and other fields which hold the details of the flights that an airline operates.
Since these 2 tables a re logically joined by the airln field, it is advisable to use the inner join.
Select aairln alnnam bfligh bcntry into table int_airdet
From zairln as a inner join zflight as b on aairln = bairln.
In order to restrict the data as per the selection criteria, a where clause can be added to the above inner join
"Using several nested INNER JOIN statements can be inefficient and cause time out if the tables become too big in the future."
Joins here (in ABAP) are not those Native SQL Joins. If you are talking about the Core RDBMS, which mean Oracle or SQL Server, then Undoubtedly Joins are the best.
In ABAP, these joins are first split by the ABAP processor and then sent to the database, with the increase in DATA in production system, these joins tend to give way if your database keeps growing larger and larger.
You should rather used "FOR ALL ENTRIES IN" (Tabular conditions), which is a much effecient way as far as performance is concerned.
For example :
DATA: BEGIN OF LINE,
CARRID TYPE SPFLI-CARRID,
CONNID TYPE SPFLI-CONNID,
CITYFROM TYPE SPFLI-CITYFROM,
CITYTO TYPE SPFLI-CITYTO,
END OF LINE,
ITAB LIKE TABLE OF LINE.
LINE-CITYFROM = 'FRANKFURT'.
LINE-CITYTO = 'BERLIN'.
APPEND LINE TO ITAB.
LINE-CITYFROM = 'NEW YORK'.
LINE-CITYTO = 'SAN FRANCISCO'.
APPEND LINE TO ITAB.
SELECT CARRID CONNID CITYFROM CITYTO
INTO CORRESPONDING FIELDS OF LINE
FROM SPFLI
FOR ALL ENTRIES IN ITAB
WHERE CITYFROM = ITAB-CITYFROM AND CITYTO = ITAB-CITYTO.
WRITE: / LINE-CARRID, LINE-CONNID, LINE-CITYFROM, LINE-CITYTO.
ENDSELECT.
Use of FOR ALL Entries
Outer join can be created using this addition to the where clause in a select statement. It speeds up the performance tremendously, but the cons of using this variation are listed below
Duplicates are automatically removed from the resulting data set. Hence care should be taken that the unique key of the detail line items should be given in the select statement.
If the table on which the For All Entries IN clause is based is empty, all rows are selected into the destination table. Hence it is advisable to check before-hand that the first table is not empty.
If the table on which the For All Entries IN clause is based is very large, the performance will go down instead of improving. Hence attempt should be made to keep the table size to a moderate level.
3.Goto Transaction code SE36 and on logical databas field
*give ' * ' and click on F4 button Now u can see all the Logical* database.
Standard logical databases will start with alphabet A to X.
4. U can change the Resolution in BDC by using CTU_PARAMS structure the field name is DEFSIZE in the structure. u need to populate this structure  pass to the bdctable.
5. use TABLE CONTROL in BDC
6.Many times in transaction pop-up screen appears and for this screen u dont pass any record but some indication to system telling it to proceed further.
to handle pop-up screen system has provide a variable called BDC_CURSOR . you pass the variable to BDC_DATA and process the screen.
7. Use SUBMIT Statement to call the program
8. Use function Module GUI_UPLOAD or ASLM_EXCEL_TO_INTERNAL_TABLE  to upload data from excel sheet
<REMOVED BY MODERATOR>
raam
Edited by: Alvaro Tejada Galindo on Apr 22, 2008 6:00 PM