Debugg a back ground task in production

Hi All,
I would like to know what are the different techniques to debugg a back ground task in production? I heard that changing WF_BATCH to dialog user and then dubugg is not a best option since we have limited authorizations in production.
Regards
RK

Hi Ramakrishna,
IN general the approach what I follow is I create a copy of the work flow which I want to debug and transport it to the PROD system. But the difference would be that in the copied work flow I make all the steps as foreground steps. For this work flow I maintain the agent assignment to user I.e. WF_ADMIN.
Or the person who is holding the role of WF_ADMIN.
The second point here is how do I start the debug work flow instead of main or original work flow. while starting work flow either by using event or directly I would populate a flag into one of container elements.
I check for this flag and if it is true then I raise an event to start test work flow.
This kind of approach can help us in so many ways
1. Without disturbing the original work flow you can change a the steps associated with work flow which is used just for testing and bug fixing.
2. You don't' have to change Work flow customizations , as you mentioned that changing WF-BATCH to some dialogue user. This kind of change can be ignored.
I would recommend that you create a separate package and create a test workflow and move the request to PROD. but make sure you don't trigger test workflow instead of original workflow.
Regards,
Pavan

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Call function inside of call function in back ground task

Hi Friends,
I am calling one function in back ground task. that is executing after save of the transaction. And inside of that transaction i am calling one more function but in debugging the cursor is not going inside of that function. What could be the reason. Please help me.
Thanks a lot in advance.

Hi,
Inside of the first function any way i will come after save
using update task debugging. Once it reach inside of firt function and if i press f5 then second function is coming and if i press f5 there then it is coming out of the function and it is not going inside. The second function is called directly not in back ground.
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Call transaction inside of call function in back ground task

Hi,
Is it possible to use call transaction statemement inside of call function in back ground task. I am getting error if i use the same. Any help will be highly appreciated.

Hi,
I don't think this is possible. The call goes into error in SM58, what you can try to do is after the function is called, you can submit the program RSARFCEX by setting the user name as sy-uname and other parameters as * and set all the checkboxes.
regards,
Advait

UPDATE and BACK GROUND TASK

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Hi
I have created a back ground task which mark attendance of specific type in pa30 .what i do is created a bapi and submit that bdc report in it using call transaction. It is working fine . when i see in pa30 after its execution it is marking attendance but in log it shows that step is under process. how can i finish it so that workflow move to next step
Regards
Ammad

Hi,
when a background task is in process for a long time then probably the method raised a short-dump somewhere.
So investigate this first.
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How to run program without set back ground Job in production Server?

Hi,
I have developed 1smart forms which is takes so much time for execution and sometimes its time out.
I have used BSEG, BKPF, BSET, KONV, VBRK, VBAP, LIPS, LIKP these tables in smartform.
So give me proper solution for this issue?
Thanks
Yatin Mahetaliya.

Hi,
You could call from your program the function module called SXPG_COMMAND_EXECUTE where you will call a command already defined in SM59 transaction code. You will maybe control the return code with sy-subrc. Then it will possible for you to extract data...
Don't forget that every time you call GUI_UPLOAD or any method or function from the frontend function group or ABAP object by classes like cl_gui_frontend_services, it will be impossible to run in background.
Try it..
pherasath

Back Ground Job scedule (emergency)

Hi all ,
I have scheduled Back Ground Job in Production System at morning 11am, now the job is in running status,but i wonder that before the status come to completed the
LAST RUN Column is filled with Date and time same at 11:am.
Please find the below job log details i am pasting last few lines of job log
Jun 5, 2008 2:15:22 PM com.virsa.cc.xsys.riskanalysis.AnalysisEngine performActPermAnalysis
INFO: Job ID:6 : Before GC => memory usage: free=481M, total=1009M
Jun 5, 2008 2:15:22 PM com.virsa.cc.xsys.riskanalysis.AnalysisEngine performActPermAnalysis
INFO: Job ID:6 : Analysis starts: HTREMGMT2
I would like to know wheather job is running or terminated.
Wat is the sequence of JOB status in CC5.2.
Kindly do the needfull.

Hi Amol,
Thank You very much for ur quick reponse,
please find the view job log details
(last few lines)
Jun 5, 2008 3:07:12 PM com.virsa.cc.xsys.riskanalysis.AnalysisEngine performActPermAnalysis
INFO: Job ID:6 : 464 out of 818 (56%) done
Jun 5, 2008 3:07:12 PM com.virsa.cc.xsys.bg.BgJob setStatus
INFO: Job ID: 6 Status: Running
Jun 5, 2008 3:07:12 PM com.virsa.cc.xsys.riskanalysis.AnalysisEngine performActPermAnalysis
INFO: Job ID:6 : Before GC => memory usage: free=347M, total=1009M
Jun 5, 2008 3:07:12 PM com.virsa.cc.xsys.riskanalysis.AnalysisEngine performActPermAnalysis
INFO: Job ID:6 : Analysis starts: MACTUSER17
Jun 5, 2008 3:07:21 PM com.virsa.cc.xsys.meng.ObjAuthMatcher <init>
FINEST: ObjAuthMatcher constructed: 0ms, #singles=970, #ranges=0, #super=0
Jun 5, 2008 3:07:22 PM com.virsa.cc.dataextractor.bo.DataExtractorSAP getObjPermissions
FINEST: getObjPermissions: elapsed time=891ms
can u tell me the job status sequence

Debugging of back ground job

Hi gui's,
How to debugg a back ground job.please any body give answer.
Thanks,
santhosh

In SM37: Select the job, type JDBG in the OK-code and press enter.
Taken from [http://searchsap.techtarget.com/tip/0,289483,sid21_gci933590,00.html]
Greetings,
Blag.

I purchased the products and I'm trying to complete a project I've started. I have an image and need to fill the back ground with a color I already have as a background layer so it blends in

I purchased the products and I'm trying to complete a project I've started. I have an image and need to fill the back ground with a color I already have as a background layer so it blends in

You should find the forum for whichever product this concerns and post your question(s) there.
Here is a link to a page that has links to all Adobe forums...
Forum links page: https://forums.adobe.com/welcome

Back ground job problem

hi every one,
pls help me out in this.
i have written a program to create a wbs element.as it takes 20 to 30 min to create one element in production.in my program, there is part of code which creates wbs elements.
so i want to run tht part of code in background.
only part of code.
even i did the coding for it. i wrote a new program and i pasted that part of code in new program.
and this new program i m submitting in old one by creating a back ground job.
i m exporting few required internal tables for new report.i hav imported all internal tables in new report also..
but still this importing exporting is not happening..pls
tell me wat can be the problem..
thanks..

Your code is not optimized according to performance,can you sed me your code ...
see my business card for my id.
Thanks

Problem in scheduling job in back ground

hi all,
My project scenario is ,i have written a program to create WBS element.
For 1 WBS creation ,In production it takes 20 to 30 min to create as there are many transactional bdcs.
so i want to run that perticular code (all bdcs) in back ground.
so i wrote another program with name 'zback_job_for_wbs_creation' and added all the required code.
in old program,i have written some code to execute this new program in back ground . this code is below..
FORM submit_for_job.
TABLES:btcevtjob.
DATA:l_jobname LIKE tbtco-jobname,
       l_jobnumber LIKE rsjobinfo-jobnumb.
DATA: count LIKE btcevtjob-jobcount,
        jobname LIKE btcevtjob-jobname.
DATA: job_was_released LIKE btch0000-char1.
jobname = 'WBS_CREATION'.
EXPORT s_scrnum TO MEMORY ID 'W_SCRNUM'.
EXPORT iscrh TO MEMORY ID 'W_ISCRH'.
EXPORT iscrl1 TO MEMORY ID 'W_ISCRL1'.
EXPORT iscrl2 TO MEMORY ID 'W_ISCRL2'.
EXPORT iscrl2b TO MEMORY ID 'W_ISCRL2B'.
EXPORT iscrl2a TO MEMORY ID 'W_ISCRL2A'.
EXPORT iscrl1a TO MEMORY ID 'W_ISCRL1A'.
CALL FUNCTION 'JOB_OPEN'
        EXPORTING
              jobname          = jobname
       IMPORTING
              jobcount         = count
SUBMIT zback_job_for_wbs_creation
with S_SCRNNUM IN S_SCRNUM
and return via JOB JOBNAME NUMBER COUNT TO SAP-SPOOL
WITHOUT SPOOL DYNPRO.
CALL FUNCTION 'JOB_CLOSE'
      EXPORTING
     jobcount                    = count
     jobname                     = jobname
      strtimmed                   = 'X'
    IMPORTING
         job_was_released            = job_was_released
   EXCEPTIONS
        cant_start_immediate        = 1
        invalid_startdate           = 2
        jobname_missing             = 3
        job_close_failed            = 4
        job_nosteps                 = 5
        job_notex                   = 6
        lock_failed                 = 7
        OTHERS                      = 8
here i have put break-point in my submitted program..but its not going to the program and job gets closed successfully without executing my code( Submitted Program).
in above submit statement , if i just write submit progname and return ,then it goes to program.
but job_close function module throws exception no 5.
so pls help me out for this..
i want my submitted program to be run in back ground..
thanks.

Hi,
Start Job Monitor SM37 and search for your job. I think you will find it.
Jobs are not linked to GUI frontend. So you can't debug your background job in that way.
If you want to debug you must be tricky.
Code a never ending loop with an exit condition which you can control by debugging.
DATA:
stop_for_capture.
DO.
IF sy-uname NE 'HABICH'. "change to your account
EXIT.
ENDIF.
IF NOT stop_for_capture IS INITIAL.
EXIT.
ENDIF.
ENDDO.
When your job is running, start TA SM50 and mark relevant batch work process and
choose by menu program -> program -> debugging.
regards
Walter Habich

Back Ground Job not showing in SM50,

Hi Friends,
I am running XK99 to Mass update Vendor details in Back ground, I am getting some error while running the job in back ground, I would like debugg the issue.
But in SM50 Iam not able to see the job I sechduled using program MASSBACK or transaction XK99.
Please let me know, what could be the problem.
Thanks,
Veerendra.

Hi,
Try this - goto SM37 select the background job and enter JDBG in the command field (similar to entering /h to debug).
Cheers.
...Reward if useful

Back ground job work in MM

CAN ANY BODY TELL ME WHAT IS A BACK GROUND JOB WORK IN MM pls explain it with good example tell me 1 or 2back ground job work relevent transactions
good answer will be awarded
kiran

Hi,
Background job means system will automatically perform some transaction / actions at perdetermined time based on the variants selected for that program.
Ex 1: You want to see the list of PO or PR or Production order created for a day, you can create a ABAP program and give the creation date in selction screen.
Provide the Plant or doc type, file path to download the report etc..
and save the variant.
You can set this program to run during mid night( 11.00 p.m) with the sysytem date (crrent date).
So system will run this program and extract the report in Application server level as per the file location given in the program selection screen.
Ex 2:
MRP program
Ex 3.
Auto PO creation program
Thanks,
Kumar Arcot

Scheduled back ground job not finishing

hie gurus, i need your help with back ground scheduling , i have created a background schedule to run my program after every 30min . in the job overview it shows my job released and active but its not finishing processing . the program being run picks up data from an external data base and then inserting via BDC call transaction. i have tried with a different program that inserts data into a database table and its executing and finishing well in the back ground. What could be the problem ? and how can i debug a back ground job ??

Daniel,
To start, BDCs are very out-dated. I would look for a BAPI if you are calling std SAP functionality.
Also - direct updates into std SAP tables is a HUGE "no-no"... I hope that you are updating custom tables only.
Pass that - to debug a b/g job--->
1) Set a breakpoint in your program
2) select the job in SM37
3) enter JDBG into the SAP fastpath of the SM37 screen and press ENTER
This will navigate you into a b/g debug - you can then press the debugger buttons to move to your breakpoint.
Hope that helps.

Back ground job - report, is scheduled 49 hrs ago, still ACTIVE??

Hi Experts,
Pls. clarify one of my simple doubt that, Weather a report(which has only one SELECT statement, with key in WHERE clause) wuld take 49 hours to execute? bcoz, I scheduled a back ground job for my_report, 49 hours ago, its still ACTIVE, OR does it went to infinitive loop?
thanq

Hi
no one select query won't take that mucj of time
may be that program went in infinite loop
please check with that
reward if useful
<b>below is the best way to write a select query</b>
Ways of Performance Tuning
1.     Selection Criteria
2.     Select Statements
     Select Queries
     SQL Interface
     Aggregate Functions
     For all Entries
Select Over more than one Internal table
Selection Criteria
1.     Restrict the data to the selection criteria itself, rather than filtering it out using the ABAP code using CHECK statement.
2.     Select with selection list.
Points # 1/2
SELECT * FROM SBOOK INTO SBOOK_WA.
CHECK: SBOOK_WA-CARRID = 'LH' AND
         SBOOK_WA-CONNID = '0400'.
ENDSELECT.
The above code can be much more optimized by the code written below which avoids CHECK, selects with selection list
SELECT CARRID CONNID FLDATE BOOKID FROM SBOOK INTO TABLE T_SBOOK
WHERE SBOOK_WA-CARRID = 'LH' AND
              SBOOK_WA-CONNID = '0400'.
Select Statements   Select Queries
1.     Avoid nested selects
2.     Select all the records in a single shot using into table clause of select statement rather than to use Append statements.
3.     When a base table has multiple indices, the where clause should be in the order of the index, either a primary or a secondary index.
4.     For testing existence , use Select.. Up to 1 rows statement instead of a Select-Endselect-loop with an Exit.
5.     Use Select Single if all primary key fields are supplied in the Where condition .
Point # 1
SELECT * FROM EKKO INTO EKKO_WA.
SELECT * FROM EKAN INTO EKAN_WA
      WHERE EBELN = EKKO_WA-EBELN.
ENDSELECT.
ENDSELECT.
The above code can be much more optimized by the code written below.
SELECT PF1 PF2 FF3 FF4 INTO TABLE ITAB
    FROM EKKO AS P INNER JOIN EKAN AS F
      ON PEBELN = FEBELN.
Note: A simple SELECT loop is a single database access whose result is passed to the ABAP program line by line. Nested SELECT loops mean that the number of accesses in the inner loop is multiplied by the number of accesses in the outer loop. One should therefore use nested SELECT loops only if the selection in the outer loop contains very few lines or the outer loop is a SELECT SINGLE statement.
Point # 2
SELECT * FROM SBOOK INTO SBOOK_WA.
CHECK: SBOOK_WA-CARRID = 'LH' AND
         SBOOK_WA-CONNID = '0400'.
ENDSELECT.
The above code can be much more optimized by the code written below which avoids CHECK, selects with selection list and puts the data in one shot using into table
SELECT CARRID CONNID FLDATE BOOKID FROM SBOOK INTO TABLE T_SBOOK
WHERE SBOOK_WA-CARRID = 'LH' AND
              SBOOK_WA-CONNID = '0400'.
Point # 3
To choose an index, the optimizer checks the field names specified in the where clause and then uses an index that has the same order of the fields . In certain scenarios, it is advisable to check whether a new index can speed up the performance of a program. This will come handy in programs that access data from the finance tables.
Point # 4
SELECT * FROM SBOOK INTO SBOOK_WA
UP TO 1 ROWS
WHERE CARRID = 'LH'.
ENDSELECT.
The above code is more optimized as compared to the code mentioned below for testing existence of a record.
SELECT * FROM SBOOK INTO SBOOK_WA
    WHERE CARRID = 'LH'.
EXIT.
ENDSELECT.
Point # 5
If all primary key fields are supplied in the Where condition you can even use Select Single.
Select Single requires one communication with the database system, whereas Select-Endselect needs two.
Select Statements           contd.. SQL Interface
1.     Use column updates instead of single-row updates
to update your database tables.
2.     For all frequently used Select statements, try to use an index.
3.     Using buffered tables improves the performance considerably.
Point # 1
SELECT * FROM SFLIGHT INTO SFLIGHT_WA.
SFLIGHT_WA-SEATSOCC =
    SFLIGHT_WA-SEATSOCC - 1.
UPDATE SFLIGHT FROM SFLIGHT_WA.
ENDSELECT.
The above mentioned code can be more optimized by using the following code
UPDATE SFLIGHT
       SET SEATSOCC = SEATSOCC - 1.
Point # 2
SELECT * FROM SBOOK CLIENT SPECIFIED INTO SBOOK_WA
WHERE CARRID = 'LH'
    AND CONNID = '0400'.
ENDSELECT.
The above mentioned code can be more optimized by using the following code
SELECT * FROM SBOOK CLIENT SPECIFIED INTO SBOOK_WA
WHERE MANDT IN ( SELECT MANDT FROM T000 )
    AND CARRID = 'LH'
    AND CONNID = '0400'.
ENDSELECT.
Point # 3
Bypassing the buffer increases the network considerably
SELECT SINGLE * FROM T100 INTO T100_WA
BYPASSING BUFFER
WHERE     SPRSL = 'D'
        AND ARBGB = '00'
        AND MSGNR = '999'.
The above mentioned code can be more optimized by using the following code
SELECT SINGLE * FROM T100 INTO T100_WA
WHERE     SPRSL = 'D'
        AND ARBGB = '00'
        AND MSGNR = '999'.
Select Statements       contd           Aggregate Functions
     If you want to find the maximum, minimum, sum and average value or the count of a database column, use a select list with aggregate functions instead of computing the aggregates yourself.
Some of the Aggregate functions allowed in SAP are MAX, MIN, AVG, SUM, COUNT, COUNT( * )
Consider the following extract.
            Maxno = 0.
            Select * from zflight where airln = LF and cntry = IN.
             Check zflight-fligh > maxno.
             Maxno = zflight-fligh.
            Endselect.
The above mentioned code can be much more optimized by using the following code.
Select max( fligh ) from zflight into maxno where airln = LF and cntry = IN.
Select Statements    contdFor All Entries
     The for all entries creates a where clause, where all the entries in the driver table are combined with OR. If the number of entries in the driver table is larger than rsdb/max_blocking_factor, several similar SQL statements are executed to limit the length of the WHERE clause.
     The plus
     Large amount of data
     Mixing processing and reading of data
     Fast internal reprocessing of data
     Fast
     The Minus
     Difficult to program/understand
     Memory could be critical (use FREE or PACKAGE size)
Points to be must considered FOR ALL ENTRIES
     Check that data is present in the driver table
     Sorting the driver table
     Removing duplicates from the driver table
Consider the following piece of extract
Loop at int_cntry.
       Select single * from zfligh into int_fligh
where cntry = int_cntry-cntry.
Append int_fligh.
Endloop.
The above mentioned can be more optimized by using the following code.
Sort int_cntry by cntry.
Delete adjacent duplicates from int_cntry.
If NOT int_cntry[] is INITIAL.
            Select * from zfligh appending table int_fligh
            For all entries in int_cntry
            Where cntry = int_cntry-cntry.
Endif.
Select Statements    contd Select Over more than one Internal table
1.     Its better to use a views instead of nested Select statements.
2.     To read data from several logically connected tables use a join instead of nested Select statements. Joins are preferred only if all the primary key are available in WHERE clause for the tables that are joined. If the primary keys are not provided in join the Joining of tables itself takes time.
3.     Instead of using nested Select loops it is often better to use subqueries.
Point # 1
SELECT * FROM DD01L INTO DD01L_WA
WHERE DOMNAME LIKE 'CHAR%'
        AND AS4LOCAL = 'A'.
SELECT SINGLE * FROM DD01T INTO DD01T_WA
    WHERE   DOMNAME    = DD01L_WA-DOMNAME
        AND AS4LOCAL   = 'A'
        AND AS4VERS    = DD01L_WA-AS4VERS
        AND DDLANGUAGE = SY-LANGU.
ENDSELECT.
The above code can be more optimized by extracting all the data from view DD01V_WA
SELECT * FROM DD01V INTO DD01V_WA
WHERE DOMNAME LIKE 'CHAR%'
        AND DDLANGUAGE = SY-LANGU.
ENDSELECT
Point # 2
SELECT * FROM EKKO INTO EKKO_WA.
SELECT * FROM EKAN INTO EKAN_WA
      WHERE EBELN = EKKO_WA-EBELN.
ENDSELECT.
ENDSELECT.
The above code can be much more optimized by the code written below.
SELECT PF1 PF2 FF3 FF4 INTO TABLE ITAB
    FROM EKKO AS P INNER JOIN EKAN AS F
      ON PEBELN = FEBELN.
Point # 3
SELECT * FROM SPFLI
INTO TABLE T_SPFLI
WHERE CITYFROM = 'FRANKFURT'
    AND CITYTO = 'NEW YORK'.
SELECT * FROM SFLIGHT AS F
    INTO SFLIGHT_WA
    FOR ALL ENTRIES IN T_SPFLI
    WHERE SEATSOCC < F~SEATSMAX
      AND CARRID = T_SPFLI-CARRID
      AND CONNID = T_SPFLI-CONNID
      AND FLDATE BETWEEN '19990101' AND '19990331'.
ENDSELECT.
The above mentioned code can be even more optimized by using subqueries instead of for all entries.
SELECT * FROM SFLIGHT AS F INTO SFLIGHT_WA
    WHERE SEATSOCC < F~SEATSMAX
      AND EXISTS ( SELECT * FROM SPFLI
                     WHERE CARRID = F~CARRID
                       AND CONNID = F~CONNID
                       AND CITYFROM = 'FRANKFURT'
                       AND CITYTO = 'NEW YORK' )
      AND FLDATE BETWEEN '19990101' AND '19990331'.
ENDSELECT.
1.     Table operations should be done using explicit work areas rather than via header lines.
2.     Always try to use binary search instead of linear search. But dont forget to sort your internal table before that.
3.     A dynamic key access is slower than a static one, since the key specification must be evaluated at runtime.
4.     A binary search using secondary index takes considerably less time.
5.     LOOP ... WHERE is faster than LOOP/CHECK because LOOP ... WHERE evaluates the specified condition internally.
6.     Modifying selected components using MODIFY itab TRANSPORTING f1 f2.. accelerates the task of updating a line of an internal table.
Point # 2
READ TABLE ITAB INTO WA WITH KEY K = 'X BINARY SEARCH.
IS MUCH FASTER THAN USING
READ TABLE ITAB INTO WA WITH KEY K = 'X'.
If TAB has n entries, linear search runs in O( n ) time, whereas binary search takes only O( log2( n ) ).
Point # 3
READ TABLE ITAB INTO WA WITH KEY K = 'X'. IS FASTER THAN USING
READ TABLE ITAB INTO WA WITH KEY (NAME) = 'X'.
Point # 5
LOOP AT ITAB INTO WA WHERE K = 'X'.
ENDLOOP.
The above code is much faster than using
LOOP AT ITAB INTO WA.
CHECK WA-K = 'X'.
ENDLOOP.
Point # 6
WA-DATE = SY-DATUM.
MODIFY ITAB FROM WA INDEX 1 TRANSPORTING DATE.
The above code is more optimized as compared to
WA-DATE = SY-DATUM.
MODIFY ITAB FROM WA INDEX 1.
7.     Accessing the table entries directly in a "LOOP ... ASSIGNING ..." accelerates the task of updating a set of lines of an internal table considerably
8.    If collect semantics is required, it is always better to use to COLLECT rather than READ BINARY and then ADD.
9.    "APPEND LINES OF itab1 TO itab2" accelerates the task of appending a table to another table considerably as compared to LOOP-APPEND-ENDLOOP.
10.   DELETE ADJACENT DUPLICATES accelerates the task of deleting duplicate entries considerably as compared to READ-LOOP-DELETE-ENDLOOP.
11.   "DELETE itab FROM ... TO ..." accelerates the task of deleting a sequence of lines considerably as compared to DO -DELETE-ENDDO.
Point # 7
Modifying selected components only makes the program faster as compared to Modifying all lines completely.
e.g,
LOOP AT ITAB ASSIGNING <WA>.
I = SY-TABIX MOD 2.
IF I = 0.
    <WA>-FLAG = 'X'.
ENDIF.
ENDLOOP.
The above code works faster as compared to
LOOP AT ITAB INTO WA.
I = SY-TABIX MOD 2.
IF I = 0.
    WA-FLAG = 'X'.
    MODIFY ITAB FROM WA.
ENDIF.
ENDLOOP.
Point # 8
LOOP AT ITAB1 INTO WA1.
READ TABLE ITAB2 INTO WA2 WITH KEY K = WA1-K BINARY SEARCH.
IF SY-SUBRC = 0.
    ADD: WA1-VAL1 TO WA2-VAL1,
         WA1-VAL2 TO WA2-VAL2.
    MODIFY ITAB2 FROM WA2 INDEX SY-TABIX TRANSPORTING VAL1 VAL2.
ELSE.
    INSERT WA1 INTO ITAB2 INDEX SY-TABIX.
ENDIF.
ENDLOOP.
The above code uses BINARY SEARCH for collect semantics. READ BINARY runs in O( log2(n) ) time. The above piece of code can be more optimized by
LOOP AT ITAB1 INTO WA.
COLLECT WA INTO ITAB2.
ENDLOOP.
SORT ITAB2 BY K.
COLLECT, however, uses a hash algorithm and is therefore independent
of the number of entries (i.e. O(1)) .
Point # 9
APPEND LINES OF ITAB1 TO ITAB2.
This is more optimized as compared to
LOOP AT ITAB1 INTO WA.
APPEND WA TO ITAB2.
ENDLOOP.
Point # 10
DELETE ADJACENT DUPLICATES FROM ITAB COMPARING K.
This is much more optimized as compared to
READ TABLE ITAB INDEX 1 INTO PREV_LINE.
LOOP AT ITAB FROM 2 INTO WA.
IF WA = PREV_LINE.
    DELETE ITAB.
ELSE.
    PREV_LINE = WA.
ENDIF.
ENDLOOP.
Point # 11
DELETE ITAB FROM 450 TO 550.
This is much more optimized as compared to
DO 101 TIMES.
DELETE ITAB INDEX 450.
ENDDO.
12.   Copying internal tables by using ITAB2[ ] = ITAB1[ ] as compared to LOOP-APPEND-ENDLOOP.
13.   Specify the sort key as restrictively as possible to run the program faster.
Point # 12
ITAB2[] = ITAB1[].
This is much more optimized as compared to
REFRESH ITAB2.
LOOP AT ITAB1 INTO WA.
APPEND WA TO ITAB2.
ENDLOOP.
Point # 13
SORT ITAB BY K. makes the program runs faster as compared to SORT ITAB.
Internal Tables         contd
Hashed and Sorted tables
1.     For single read access hashed tables are more optimized as compared to sorted tables.
2.      For partial sequential access sorted tables are more optimized as compared to hashed tables
Hashed And Sorted Tables
Point # 1
Consider the following example where HTAB is a hashed table and STAB is a sorted table
DO 250 TIMES.
N = 4 * SY-INDEX.
READ TABLE HTAB INTO WA WITH TABLE KEY K = N.
IF SY-SUBRC = 0.
ENDIF.
ENDDO.
This runs faster for single read access as compared to the following same code for sorted table
DO 250 TIMES.
N = 4 * SY-INDEX.
READ TABLE STAB INTO WA WITH TABLE KEY K = N.
IF SY-SUBRC = 0.
ENDIF.
ENDDO.
Point # 2
Similarly for Partial Sequential access the STAB runs faster as compared to HTAB
LOOP AT STAB INTO WA WHERE K = SUBKEY.
ENDLOOP.
This runs faster as compared to
LOOP AT HTAB INTO WA WHERE K = SUBKEY.
ENDLOOP.

Debugg a back ground task in production

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