Select Query - Optimized Way

Hello ABAP Gurus..
I dont have much idea about ABAP side but we have a requirement in our project where we need to fetch huge amount of data from backend and display it on the WebDynpro Java screen. I was going through the paging solution provided by SAP so that we can minimize the Java AS server memory and performance issues.
I was wondering if we can get the selective no of records from tables based on pagesize. What I mean here:
Suppose total no of record that I want to display on the WebDynpor screen is say 10000.
PageSize of my webdynpro table = 100 records
Now Can I write a select query (or is there any other way) to get data from backened table pagewise like at first hit I get records from 1 - 100, second hit I should get records from 101 - 200 , third hit from 201 - 300.. and so on till the lat record?
Is it possible? If yes, how can I acheive this?
-Abhinav

Hey Rob ,
Thanks for quick response.
However, I have a doubt here.
Suppose my PACKAGE SIZE is 100 and I fetch first 100 records in first RFC call, then how do i fetch records from 101 - 200 in the subsequent RFC call?
Also, I guess SELECT .. ENDSELECT has its own performance problems
- Abhinav

Similar Messages

Please help me what other way i can tune this select query..

Hello Guru,
I have a select query which retrieve data from 10 tables and around 4 tables having 2-4 Lac record and rest are having 80,000 - 1 Lac record.
It is taking around 7-8 seconds to fetch 55000 record.
I was strictly told by the client that i should not use HINTS in my query. My query is below. Please help me what other way i can tune this select query..
select
CT.CUST_ID
,CT.ROMANISED_SURNAME
,CT.SURNAME
,CT.ROMANISED_GIVEN_NAME
,CT.GIVEN_NAME
,CT.ROMANISED_MIDDLE_NAME
,CT.MIDDLE_NAME
,CT.ROMANISED_NAME_SUFFIX
,CT.NAME_SUFFIX
,CT.ROMANISED_TITLE
,CT.TITLE
,CT.ROMANISED_NAME_INITIALS
,CT.NAME_INITIALS
,CT.NAME_TEXT
,CT.CUST_JRNY_ID
,RK.REMARK_TYPE
,RK.REMARK_ID+CT.CUST_ID as REMARK_ID
,RK.REMARK_STATUS
,RK.REMARK_TEXT
,RK.HOST_ONLY_IND
,RK.SUPERVISORY_IND
,RK.CUST_COMM_IND
,RK.REMARK_SEQ
,RK.REMARK_CODE
,RK.DEFAULT_CUST_REL_IND
,RK.DEFAULT_FLIGHT_SEG_REL_IND
,RK.IATA_CODE
,RK.ICAO_CODE
,CJ.RECORD_LOCATOR "SITA_RECORD_LOCATOR"
,Cjv.Record_Locator "ORIGINATOR_RECORD_LOCATOR"
,FS.TRAVELLING_GROUP_CODE
,CG.GROUP_NAME
FROM FLIGHT_LEG FL
,CUST_FLIGHT_LEG CFL
,CUST CT
,CUST_REMARK CTR
,REMARK RK
,FLIGHT_SEG_FLIGHT_LEG FSFL
,FLIGHT_SEG FS
,CUST_JRNY CJ
,CUST_JRNY_VERSION CJV
,CUST_GROUP CG
WHERE FL.OPR_FLIGHT_NUMBER = 1--I_OPR_FLIGHT_NUMBER
and FL.HISTORY_VERSION_NUMBER = 0
and FL.DEPARTURE_STATION_CODE = 'DEL'--I_DEPARTURE_STATION_CODE
and FL.DEPARTURE_DATETIME = TO_DATE('10-DEC-2012 18.45.00', 'DD-MON-YYYY HH24.MI.SS')
and FL.OPR_SERVICE_PROVIDER_CODE= 'AI'--i_opr_service_provider_code
and FL.OPR_FLIGHT_SUFFIX = 'A'--NVL(I_OPR_FLIGHT_SUFFIX, FL.OPR_FLIGHT_SUFFIX)
AND FL.FLIGHT_LEG_ID = CFL.FLIGHT_LEG_ID
AND CFL.CUST_ID = CT.CUST_ID
AND FL.FLIGHT_LEG_ID=FSFL.FLIGHT_LEG_ID
AND FSFL.FLIGHT_SEG_ID=FS.FLIGHT_SEG_ID
AND CT.CUST_ID = CTR.CUST_ID(+)
AND CTR.REMARK_ID = RK.REMARK_ID(+)
AND FL.CUST_JRNY_ID = CJ.CUST_JRNY_ID
and CJ.CUST_JRNY_ID = CJV.CUST_JRNY_ID
AND CG.CUST_JRNY_ID(+) = CT.CUST_JRNY_ID
AND CFL.HISTORY_VERSION_NUMBER = 0
AND CT.HISTORY_VERSION_NUMBER = 0
AND NVL(CTR.HISTORY_VERSION_NUMBER,0) = 0
AND NVL(RK.HISTORY_VERSION_NUMBER,0) = 0
AND FS.HISTORY_VERSION_NUMBER = 0
AND FSFL.HISTORY_VERSION_NUMBER = 0
-- AND CJ.HISTORY_VERSION_NUMBER = 0
and CJV.VERSION_NUMBER = 0 --- Need to check
AND NVL(CG.HISTORY_VERSION_NUMBER,0) = 0
order by CT.CUST_JRNY_ID,CT.CUST_ID;
The Tables having record:
select COUNT(*) from FLIGHT_LEG -----241756
select COUNT(*) from CUST_FLIGHT_LEG---632585
select COUNT(*) from CUST---240015
select COUNT(*) from CUST_REMARK---73724
select COUNT(*) from REMARK---73654
select COUNT(*) from FLIGHT_SEG_FLIGHT_LEG---241789
select COUNT(*) from FLIGHT_SEG----260004
select COUNT(*) from CUST_JRNY----74288
select COUNT(*) from CUST_JRNY_VERSION----74477
select COUNT(*) from CUST_GROUP----55819
Thanks,
HP..

Plan hash value: 3771714931
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 10239 | 2949K| | 7515 (1)| 00:01:31 | | |
| 1 | SORT ORDER BY | | 10239 | 2949K| 3160K| 7515 (1)| 00:01:31 | | |
|* 2 | HASH JOIN | | 10239 | 2949K| | 6864 (1)| 00:01:23 | | |
| 3 | PARTITION HASH ALL | | 73687 | 1079K| | 417 (1)| 00:00:06 | 1 | 512 |
|* 4 | TABLE ACCESS FULL | CUST_JRNY_VERSION | 73687 | 1079K| | 417 (1)| 00:00:06 | 1 | 512 |
|* 5 | HASH JOIN | | 10239 | 2799K| | 6445 (1)| 00:01:18 | | |
| 6 | PARTITION HASH ALL | | 73654 | 863K| | 178 (1)| 00:00:03 | 1 | 512 |
| 7 | TABLE ACCESS FULL | CUST_JRNY | 73654 | 863K| | 178 (1)| 00:00:03 | 1 | 512 |
|* 8 | FILTER | | | | | | | | |
|* 9 | HASH JOIN RIGHT OUTER | | 10239 | 2679K| | 6267 (1)| 00:01:16 | | |
| 10 | PARTITION HASH ALL | | 55315 | 756K| | 137 (1)| 00:00:02 | 1 | 512 |
| 11 | TABLE ACCESS FULL | CUST_GROUP | 55315 | 756K| | 137 (1)| 00:00:02 | 1 | 512 |
|* 12 | FILTER | | | | | | | | |
|* 13 | HASH JOIN OUTER | | 10240 | 2540K| 2056K| 6129 (1)| 00:01:14 | | |
|* 14 | FILTER | | | | | | | | |
|* 15 | HASH JOIN RIGHT OUTER | | 10242 | 1930K| | 5531 (1)| 00:01:07 | | |
| 16 | INDEX FAST FULL SCAN | CUST_REMARK_PK | 73677 | 935K| | 190 (0)| 00:00:03 | | |
|* 17 | HASH JOIN | | 10257 | 1802K| | 5339 (1)| 00:01:05 | | |
|* 18 | HASH JOIN | | 10257 | 701K| | 3516 (1)| 00:00:43 | | |
|* 19 | HASH JOIN | | 3963 | 220K| | 2476 (1)| 00:00:30 | | |
|* 20 | HASH JOIN | | 3963 | 181K| | 1300 (1)| 00:00:16 | | |
| 21 | PARTITION HASH ALL | | 3963 | 131K| | 728 (1)| 00:00:09 | 1 | 512 |
|* 22 | TABLE ACCESS FULL | FLIGHT_LEG | 3963 | 131K| | 728 (1)| 00:00:09 | 1 | 512 |
|* 23 | INDEX FAST FULL SCAN| FLIGHT_SEG_FLIGHT_LEG_PK | 240K| 3059K| | 571 (1)| 00:00:07 | | |
| 24 | PARTITION HASH ALL | | 259K| 2531K| | 1175 (1)| 00:00:15 | 1 | 512 |
|* 25 | TABLE ACCESS FULL | FLIGHT_SEG | 259K| 2531K| | 1175 (1)| 00:00:15 | 1 | 512 |
| 26 | PARTITION HASH ALL | | 631K| 8011K| | 1037 (1)| 00:00:13 | 1 | 512 |
|* 27 | TABLE ACCESS FULL | CUST_FLIGHT_LEG | 631K| 8011K| | 1037 (1)| 00:00:13 | 1 | 512 |
| 28 | PARTITION HASH ALL | | 239K| 25M| | 1822 (1)| 00:00:22 | 1 | 512 |
|* 29 | TABLE ACCESS FULL | CUST | 239K| 25M| | 1822 (1)| 00:00:22 | 1 | 512 |
| 30 | PARTITION HASH ALL | | 73623 | 4385K| | 243 (1)| 00:00:03 | 1 | 512 |
| 31 | TABLE ACCESS FULL | REMARK | 73623 | 4385K| | 243 (1)| 00:00:03 | 1 | 512 |
Predicate Information (identified by operation id):
2 - access("CJ"."CUST_JRNY_ID"="CJV"."CUST_JRNY_ID")
4 - filter("CJV"."VERSION_NUMBER"=0)
5 - access("FL"."CUST_JRNY_ID"="CJ"."CUST_JRNY_ID")
8 - filter(NVL("CG"."HISTORY_VERSION_NUMBER",0)=0)
9 - access("CG"."CUST_JRNY_ID"(+)="CT"."CUST_JRNY_ID")
12 - filter(NVL("RK"."HISTORY_VERSION_NUMBER",0)=0)
13 - access("CTR"."REMARK_ID"="RK"."REMARK_ID"(+))
14 - filter(NVL("CTR"."HISTORY_VERSION_NUMBER",0)=0)
15 - access("CT"."CUST_ID"="CTR"."CUST_ID"(+))
17 - access("CFL"."CUST_ID"="CT"."CUST_ID")
18 - access("FL"."FLIGHT_LEG_ID"="CFL"."FLIGHT_LEG_ID")
19 - access("FSFL"."FLIGHT_SEG_ID"="FS"."FLIGHT_SEG_ID")
20 - access("FL"."FLIGHT_LEG_ID"="FSFL"."FLIGHT_LEG_ID")
22 - filter("FL"."DEPARTURE_STATION_CODE"='DEL' AND "FL"."DEPARTURE_DATETIME"=TO_DATE(' 2012-12-10 18:45:00', 'syyyy-mm-dd
hh24:mi:ss') AND "FL"."OPR_SERVICE_PROVIDER_CODE"='AI' AND "FL"."OPR_FLIGHT_NUMBER"=1 AND "FL"."OPR_FLIGHT_SUFFIX"='A' AND
"FL"."HISTORY_VERSION_NUMBER"=0)
23 - filter("FSFL"."HISTORY_VERSION_NUMBER"=0)
25 - filter("FS"."HISTORY_VERSION_NUMBER"=0)
27 - filter("CFL"."HISTORY_VERSION_NUMBER"=0)
29 - filter("CT"."HISTORY_VERSION_NUMBER"=0)

Optimizing the select query

Hi All,
I would like to know what would be alternate table or optimal way to make the following queries work in a more efficient manner.
1) select sfakn from vbrk into table tl_sfakn for all entries in tl_vbrp WHERE sfakn = tl_vbrp-vbeln.
2) SELECT vbeln FROM vbrp INTO TABLE tl_vbrp FOR ALL ENTRIES IN tl_vbap[] WHERE vgbel = tl_vbap-vbeln.
any help would be appreciated.
thanks
vijay

Hello Vijay,
How doing?. plz find my suggestions
1. fetch vgbel ( sales document) also into tl_vbrp in previous select. Now make use of document flow as shown
select vbeln from vbfa
into table tl_vbfa for all entries in tl_vbrp
where vbelv EQ t_vbrp-vgbel and
VBTYP_N IN ('M','N','O','P'). "billing docs
if tl_vbfa[] is not inital.
select vbeln sfakn
into table tl_sfakn
from vbrk for all entries in tl_vbfa
where vbeln EQ tl_vbfa-vbeln.
if sy-subrc EQ 0.
delete tl_sfakn where sfakn is initial.
endif.
endif.
2. u can use VBFA as shown above , use preceding and subsequent document category appropriately
thanks
sreejith

OPtimizing Performance for Select query on NAST table

Hi All,
   We are fetching a single record from NAST table. The table has around 10 Million Entries.
   The Select Query takes around 5-6 minutes to return.
   We are not using the Primary key completely. We are using only one field of the primary key.
    The field is also a part of the Index but we are not using all the fields in the index as well.
    We need to bring down the time. What can be the solution? I cant see any changes to the code, since its a single query and we cant use the Entire Primary key.
   Would creating an Index on the fields that we are concerned with help in this regard.
   Open to all solutions.
Thanks in Advance,
Imran

Hi,
Please check this thread
http://sap.ittoolbox.com/documents/popular-q-and-a/specifying-the-index-to-be-used-2462
For creating another secondary index in NAST whether basis will approve for this?
aRs

OPtimizing Performance for Select query on huge table

Hi All,
   We are fetching a single record from NAST table. The table has around 10 Million Entries.
   The Select Query takes around 5-6 minutes to return.
   We are not using the Primary key completely. We are using only one field of the primary key.
    The field is also a part of the Index but we are not using all the fields in the index as well.
    We need to bring down the time. What can be the solution? I cant see any changes to the code, since its a single query and we cant use the Entire Primary key.
   Would creating an Index on the fields that we are concerned with help in this regard.
   Open to all solutions.
Thanks in Advance,
Imran

There are sometimes tricks you can use to get it to use the index more efficiently. If you let us know which fields you are using in the SELECT (all of them actually), we might be able to help.
Or are you saying you can't change the code at all?
Please don't create duplicate posts though.
Rob
Message was edited by:
        Rob Burbank

Is there a way to use owa_opt_lock.checksum in Select query that returns multiple records?

Trying to do something as data would be uploaded and edited in grid. At present I am using Ora_Hash.
SELECT
        e.ROWID, e.Employee_Id,e.First_Name,e.Last_Name,e.Email,e.Phone_Number,e.Hire_Date,
        e.Job_Id,e.Salary,e.Manager_Id,e.Department_Id,
        owa_opt_lock.checksum('HR','EMPLOYEES', e.rowid) As HashForThisRow
FROM EMPLOYEES e;
Thx

No you can't.
owa_opt_lock.checksum is a function which is used for optimist locking. It locks the row(probably by using Select FOR Update mechanism) which you select and which you are trying to update. As a result, what you are eventually trying to do is that inside a Select query you are using a function that is locking the rows, which is not allowed. And thus your query will fail with the below mentioned error.
ORA-14551: cannot perform a DML operation inside a query
ORA-06512: at "SYS.DBMS_SQL", line 1575
ORA-06512: at "SYS.OWA_OPT_LOCK", line 172
14551. 00000 - "cannot perform a DML operation inside a query "
*Cause:    DML operation like insert, update, delete or select-for-update
           cannot be performed inside a query or under a PDML slave.
*Action:   Ensure that the offending DML operation is not performed or
           use an autonomous transaction to perform the DML operation within
           the query or PDML slave.
Thanks,
Ishan

Most optimized way to pick open items for customer

Dear experts,
I have a restriction that i can pass only companycode and documenttype in where clause of BSID select
      SELECT BUKRS KUNNR VBELN BUDAT BELNR ZFBDT   "--- zfbdt added on 15.12.2010
    FROM BSID
    INTO CORRESPONDING FIELDS OF TABLE IT_ADJUST
    WHERE
    BUKRS = P_BUKRS
    AND BLART = 'RV'.
I cant change this query but going through response time,i need a more optimized way as an alternate to pick all open items of a customer given in a company code of RV doctype .Seeking your help dear experts.I found BAPI_AR_ACC_GETOPENITEMS but in this bapi i cant pass customer so can exploit it.
Regards.
Aditya Sharma.

Take a look at the current websites that offer information
about the sporting events you are interested in. Do any of them
offer RSS feeds? If so, you can roll your own RSS aggregator to
pull the information down from them to use in your application.
Keep in mind:
In some cases, someone had to compile this data from a number
of different souces, which may mean the websites may have
restrictions on how the data in their feeds can be used.
If you are dealing with just one sport at just one level
(collegiate, NBA, etc) you can go directly to the site of the
overseeing body of the sport to see if you can obtain the data you
want in electronic format.

Regarding to perform in select query

could any tell the select query in this piece of code would affect the performance of the programe
DATA: BEGIN OF OUTREC,
      BANKS LIKE BNKA-BANKS,
      BANKL LIKE BNKA-BANKL,
      BANKA LIKE BNKA-BANKA,
      PROVZ LIKE BNKA-PROVZ,   "Region (State, Province, County)
      BRNCH LIKE BNKA-BRNCH,
      STRAS LIKE BNKA-STRAS,
      ORT01 LIKE BNKA-ORT01,
      SWIFT LIKE BNKA-SWIFT,
END OF OUTREC.
OPEN DATASET P_OUTPUT FOR OUTPUT IN TEXT MODE.
IF SY-SUBRC NE 0. EXIT. ENDIF.
SELECT * FROM BNKA
         WHERE BANKS EQ P_BANKS
         AND   LOEVM NE 'X'
         AND   XPGRO NE 'X'
         ORDER BY BANKS BANKL.
PERFORM TRANSFER_DATA.
ENDSELECT.
CLOSE DATASET P_OUTPUT.
*&      Transfer the data to the output file
FORM TRANSFER_DATA.
OUTREC-BANKS = BNKA-BANKS.
OUTREC-BANKL = BNKA-BANKL.
OUTREC-BANKA = BNKA-BANKA.
OUTREC-PROVZ = BNKA-PROVZ.
OUTREC-BRNCH = BNKA-BRNCH.
OUTREC-STRAS = BNKA-STRAS.
OUTREC-ORT01 = BNKA-ORT01.
OUTREC-SWIFT = BNKA-SWIFT.
TRANSFER OUTREC TO P_OUTPUT.
ENDFORM.                               " READ_IN_DATA

Hi
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.

Query- Alternative way

Hi All,
Below is the query used to retrieve records based on organization and responsibility parameters
select * from WIP_DISCRETE_JOBS where ORGANIZATION_ID = :ORG_ID
and :ORG_ID !=-1
union all
select * from WIP_DISCRETE_JOBS where ORGANIZATION_ID in
select ORGANIZATION_ID from HR_ALL_ORGANIZATION_UNITS
where ORGANIZATION_ID in (select ORGANIZATION_ID
from MTL_PARAMETERS
and not exists (
select 1
from ORG_ACCESS AB,
HR_ALL_ORGANIZATION_UNITS B
where AB.ORGANIZATION_ID = B.ORGANIZATION_ID
and AB.RESPONSIBILITY_ID = :P_RESP_ID
union
select AB.ORGANIZATION_ID
from ORG_ACCESS AB, HR_ALL_ORGANIZATION_UNITS B
where AB.ORGANIZATION_ID = B.ORGANIZATION_ID
and AB.RESPONSIBILITY_ID = :P_RESP_ID
AND :ORG_ID = -1
Here user can enter specific ORG_ID to get the results. Also user has provision to get all the organization belonging to particular P_RESP_ID parameter. When user pass ORG_ID = -1 then it mean, he wants all organization for the entered parameter P_RESP_ID.
Note: If user enters -1, only last part of ' union all' returns results, otherwise first part of 'union all' returns results. Also tables will have 0 records for parameter ORG_ID = -1 . So I have selected -1 as decision parameter.
Now my question is, Is there any other way of writing this query? I want to have query with good performance and more optimized. As per my knowledge this is the optimized query. Can anyone suggest if there is good optimized way of writing the same query?
Regards,
SK

Hi,
Maybe:
WITH     good_organization_ids     AS
     SELECT     oa.oraganiztion_id
     FROM     org_access             oa
     JOIN     hr_all_organization_units haou      ON oa.organization_id = haou.organization_id
     WHERE     oa.responsibility_id     = :p_resp_id
SELECT     *
FROM     wip_discrete_jobs
WHERE     (     :org_id     != 1
     AND     :org_id     = organizatiOn_id
OR     (     :org_id     = 1
     AND      (     organization_id IN (
                              SELECT organization_id
                              FROM     good_organization_ids
          OR     NOT EXISTS        (
                              SELECT     1
                              FROM     good_organization_ids
;If you'd care to post a little sample data (CREATE TABLE and INSERT statements) for all tables, a couple of sets of parameters (:org_id and :p_resp_id), and the results you want from the same sample data for each set or parameters, then I could test it.
See the forum FAQ
SQL and PL/SQL FAQ
for how to ask questions in general, and how to ask about performance problems in particular.

Oracle 11g :SELECT query blocked..??

Hi Experts,
could you please explain why the below SQL query is blocked?
SELECT 1 FROM DUAL is blocking the SQL statement on GTTAPPUSR@gttccuatcriba04 ( SID=469 ) blocked SQL -> DELETE FROM GTTDB.PURCHASE_ENTRY_ID=:1
SELECT 1 FROM DUAL is blocking the SQL statement on GTTAPPUSR@gttccuatcriba04 ( SID=367 ) blocked SQL -> DELETE FROM GTTDB.PURCHASE_ENTRY_ID=:1
I am scratching my head without any solution when I had a look at the db today. Thanks in advance for your help.
Regards,
Boris
Edited by: user12075620 on Dec 4, 2012 8:58 AM

The SELECT statement is not blocking the UPDATE. As I said in the previous reply, the string that this query produces does not match the logic.
This query is (at least on the surface) correctly identifying that session 1 is blocking session 2. Session 1 holds some lock that session 2 is waiting on. So far, so good. Since session 2 is waiting on the lock, we can easily enough see what session 2 is running (the UPDATE statement). But since session 1 is not blocked, it is potentially off running a ton of other SQL statements (or no SQL statement at all). The query is looking to see what session 1 is running currently. It has no way of determining what session 1 ran at some point in the past to acquire the lock in the first place.
Going back to my KING example,
At noon, session 1 runs
UPDATE emp
SET sal = sal * 2
WHERE ename = 'KING'Session 1 now has a lock on the KING row in the EMP table. But session 1 neither commits nor rolls back, it is still in a transaction. Session 1 might not have any more activity for a long time-- the user might go off to lunch, for example (obviously, applications should not be designed to allow users to maintain open transactions indefinitely, but not all applications are designed correctly). Or it might start running other queries. Let's say that session 1 now runs a query that is going to go for an hour
SELECT *
FROM giant_view_with_lots_of_computationsNow, at 12:45, session 2 comes in and runs
UPDATE emp
SET bonus = 100
WHERE ename = 'KING'Session 2 is blocked. Session 2 is running the UPDATE statement. Session 1 still holds the lock but it is running some completely unrelated SQL statement.
If we run the query you posted, the query will correctly report that session 1 is running the query against the GIANT_VIEW_WITH_LOTS_OF_COMPUTATIONS but incorrectly imply that this SELECT query is the source of the lock. It is not. It simply happens to be the query that the session that does hold the lock happens to be executing at the current moment (why the application seems to be running a lot of queries that select a constant from dual is a separate question).
Justin

SELECt query in UNiX environment

Iam using hp unix with oracle 11g
when i try to spool 26 lack records it is giving me error
" There is not enough memory available now.
O/S Message: Broken pipe"
is there is any other way SQL commands, we can limit the SELECT query to spool specific number of times other than using
FOR LOOP.. with LIMIT cluase

logdata=`${SQLPLUS} -S username/password<< EOF
                    SET ECHO OFF
                    SET LINESIZE 2000
                    SET NEWPAGE 0
                    SET SPACE 0
                    SET PAGESIZE 0
                    SET FEEDBACK OFF
                    SET HEADING OFF
                    SET TRIMSPOOL ON
                    SET TAB OFF
                    set autoprint on
                    set serveroutput on
                    set spool on
                    spool ${SPOOL_FILE}
                    set termout off
               WHENEVER SQLERROR EXIT SQL.SQLCODE
               whenever oserror exit 1;
                    $GetQuery ==> there come's the SELECT statement which spool's 25 lakh records.
                    spool off
               EXIT
                    END`
While spooling records it throws the error
There is not enough memory available now.
O/S Message: Broken pipe
i want u use spooling instead of using util_file to write each and every rows in a file
Edited by: user9080289 on Apr 29, 2010 5:04 AM

Select query in a report

Hi!
Is it possible to modify a select query for a report in the following way:
I have created two fields where users input values and operators.
Operators selection is a static list consisting of: =, like , in
Value field is a text field.
The current query is:
SELECT
A,
B,
C
from TABLE
I would like to add:
WHERE
A : P1_OPERATOR : P1_VALUE
but it doesn't work; I get a notification that the operator is incorrect.
It has a defaulft value = and when I set let's say 5 in the value field the whole query should be:
SELECT
A,
B,
C
from TABLE
WHERE
A = 5
Regards!

Hmm, I get the following error:
Updatable report parse error:
ORA-20001: Query must begin with SELECT or WITH
The only difference I see is that your type is SQL Query (PL/SQL function body returning SQL query) while I have SQL Query (updateable report) hardcoded.
I have APEX 4.2.2, I'm not quite sure how to change this...
This is my code:
begin
:P7_QUERY := 'select ROWID,BNK_ID,MSR_PRD_ID,SRC_STM_ID,ID,ID_RETKA,RSP,OZNAKA_RETKA,DATUM_STANJA,OZNAKA_IZVJESCA,OZNAKA_KOMITENTA,MBR_KOMITENTA,KOMITENT_NEREZ,ZUPANIJA,DRZAVA,SEKTOR_NEREZIDENTA,VRSTA_POVEZANOSTI,INSTRUMENT,ISIN,VALUTA,OTKAZNI_ROK,IZVORNO_DOSPIJECE,VRSTA_INDEKSACIJE,VALUTA_INDEKSACIJE,PORTFELJ,UTRZIVOST_KREDITA,ZNACAJKE_KAPITALA,RIZICNA_SKUPINA,UGRADJENI_DERIVAT,ODNOSNA_VARIJABLA,PREDZNAK,IZNOS,IZNOS_ACTUAL,VRSTA_IZNOSA,KOMITENT_PBR,UDJELI_POVEZ_C,AR_ID,AU_ID,ACT_AR_BAL_KN,ACT_AR_BAL,AR_BUSS_ID,MTI_CCY_TP_ID,REG_NO,REG_SFX,JMBG_ID_NO,IP_ID,NO_DYS_OO,TAX_ID_NO,INSTRUMENT_OLD,PREDZNAK_OLD,IZNOS_ACTUAL_OLD,ACT_AR_BAL_KN_OLD,ACT_AR_BAL_OLD,NAPOMENA,NOVI_POSAO_F,LISTA_SUMARNA,LISTA_REKAP,POSTOTAK1,POSTOTAK2,POSTOTAK3,DZS_IDY_CL_ID,HNB_IP_CL_ID,EXG_RT_CRD_RSK_F from DWP.IZV_SLOG_DET
where ' || :P7_X_FC1 || :P7_X_O1 || :P7_X_O1;
return :P7_QUERY;
end;
I have also set Use Generic Column Names (parse query at runtime only) nad P7_QUERY as page item to submit.
Regards,
Ivan

Using case when statement in the select query to create physical table

Hello,
I have a requirement where in I have to execute a case when statement with a session variable while creating a physical table using a select query. let me explain with an example.
I have a physical table based on a select table with one column.
SELECT 'VALUEOF(NQ_SESSION.NAME_PARAMETER)' AS NAME_PARAMETER FROM DUAL. Let me call this table as the NAME_PARAMETER table.
I also have a customer table.
In my dashboard that has two pages, Page 1 contains a table with the customer table with column navigation to my second dashboard page.
In my second dashboard page I created a dashboard report based on NAME_PARAMETER table and a prompt based on customer table that sets the NAME_ PARAMETER request variable.
EXECUTION
When i click on a particular customer, the prompt sets the variable NAME_PARAMETER and the NAME_PARAMETER table shows the appropriate customer.
everything works as expected. YE!!
Now i created another table called NAME_PARAMETER1 with a little modification to the earlier table. the query is as follows.
SELECT CASE WHEN 'VALUEOF(NQ_SESSION.NAME_PARAMETER)'='Customer 1' THEN 'TEST_MART1' ELSE TEST_MART2' END AS NAME_PARAMETER
FROM DUAL
Now I pull in this table into the second dashboard page along with the NAME_PARAMETER table report.
surprisingly, NAME_PARAMETER table report executes as is, but the other report based on the NAME_PARAMETER1 table fails with the following error.
Error Codes: OPR4ONWY:U9IM8TAC:OI2DL65P
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 16001] ODBC error state: S1000 code: 1756 message: [Oracle][ODBC][Ora]ORA-01756: quoted string not properly terminated. [nQSError: 16014] SQL statement preparation failed. (HY000)
SQL Issued: SET VARIABLE NAME_PARAMETER='Novartis';SELECT NAME_PARAMETER.NAME_PARAMETER saw_0 FROM POC_ONE_DOT_TWO ORDER BY saw_0
If anyone has any explanation to this error and how we can achieve the same, please help.
Thanks.

Hello,
Updates :) sorry.. the error was a stupid one.. I resolved and I got stuck at my next step.
I am creating a physical table using a select query. But I am trying to obtain the name of the table dynamically.
Here is what I am trying to do. the select query of the physical table is as follows.
SELECT CUSTOMER_ID AS CUSTOMER_ID, CUSTOMER_NAME AS CUSTOMER_NAME FROM 'VALUEOF(NQ_SESSION.SCHEMA_NAME)'.CUSTOMER.
The idea behind this is to obtain the data from the same table from different schemas dynamically based on what a session variable. Please let me know if there is a way to achieve this, if not please let me know if this can be achieved in any other method in OBIEE.
Thanks.

Can we get data return from stored procedure in a select query ?

Hello,
Suppose i have a function GetSum(x,y) that returns sum of two numbers x and y .We can call this function from within a sql function like this :
select GetSum(4,5) SUM from dual;But is this possible through a stored procedure ? i.e., can i call a stored procedure from within a select query like i have done in above code ?

Hi,
bootstrap wrote:
Hello,
Suppose i have a function GetSum(x,y) that returns sum of two numbers x and y .We can call this function from within a sql function like this :
select GetSum(4,5) SUM from dual;But is this possible through a stored procedure ? i.e., can i call a stored procedure from within a select query like i have done in above code ?The short answer has already been given.
Why can't you use a function?
Suppose you could use a procedure. What results would you want to see from:
SELECT my_proc (4, 5)
FROM dual
;? Why?
Explain what you want to do, and somebody will help you find a good way to do it.

Problem with JOINs in SELECT query

The parameter wa_dob-e_dob is not getting its definition ....
it contains DOB in current yr.
As i am using Joins also Workarea.... so is it coz Joins & WA cant be used simultaneously in a SELECT query....
Is there any other option to do the same...?
* Global Structure
TYPES : BEGIN OF t_data ,                     "Structure
        emp_dob TYPE pa0002-gbdat,
        emp_Mailid TYPE pa0105-usrid,
       END OF t_data,
       BEGIN OF t_dob,
       e_dob TYPE pa0002-gbdat,
       e_pernr type pa0002-pernr,
       END OF t_dob.
* Global Internal Tables (I_)
DATA : i_data TYPE TABLE OF t_data,           "Internal Table for output data
       i_dob TYPE TABLE OF t_dob.             "Internal table for Dob
* Global Work Area (WA_)
DATA : wa_data TYPE t_data,                  "Work Area for output data
       wa_dob TYPE t_dob.                    "Work Area for Dob
*this is the query where i am getting error
* Field "WA_DOB-E_DOB" Not found.
LOOP AT i_dob INTO wa_dob.
    SELECT pa0002~gbdat pa0105~usrid INTO CORRESPONDING FIELDS OF wa_data
      FROM pa0002
      INNER JOIN pa0105
      ON pa0002~pernr = pa0105~pernr
      WHERE pa0105~subty EQ 'MAIL' AND
     wa_dob-e_dob BETWEEN w_sysdate AND w_edit_sysdate.
    ENDSELECT.
    APPEND wa_data TO i_data.
    CLEAR wa_data.
    CLEAR wa_dob.
    CLEAR l_temp_dob.
ENDLOOP.

Hi,
you are checking the work area in the SELECT. IN WHERE condition of the select u should specify fields in either of the tables pa0002 , pa0105 for data population.
The select is on the database table and not on the work area.for checking the data in the work area do this way:
loop at it_dob into wa_dob.
if wa_dob-e_dob between the range u want (w_sysdate AND w_edit_sysdate)
endif.
endloop.
ie: wa_dob-e_dob >w_sysdate AND wa_dob-e_dob < w_edit_sysdate or
    wa_dob-e_dob < w_sysdate AND wa_dob-e_dob > w_edit_sysdate
watever ur requirement is..
regards,
madhu

Select Query - Optimized Way

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