Performance issue with RESB table
Hi,
User want to improve the performance of a standard program RLLL07SE in which a RESB table data is fetched and take much time on it.
The select querry for RESB is,
SELECT * FROM RESB WHERE
MATNR = MATNR AND
WERKS = WERKS AND
XLOEK = SPACE AND "Löschkennzeichen
KZEAR = SPACE AND "endausgefaßt
XWAOK = CON_X AND "Warenausgang erlaubt
LGNUM = LGNUM AND
LGTYP = LGTYP AND
LGPLA = LGPLA.
whereas the table index is created on following fields of RESB,
MATNR
WERKS
XLOEK
KZEAR
BDTER
What possible can be done in this respect as the program is a standard one we can change only in Table Inxex I guess..or what else can be done?
Can we add LGNUM LGTYP LGPLA into the particular index apart from the existing fields?
Hi,
Instead of creating the Index, Get Data from RESB with the where clause having the entire key of the index and then loop to the internal and delete the unwanted entries as shown below.
loop at itab.
if itab-LGNUM = LGNUM AND
itab-LGTYP = LGTYP AND
itabLGPLA.
else.
delete itab index sy-tabix.
endif.
endloop.
As u r getting data with entire index fields the performance will surely increase. Also avoid Select * and retrieve whatever fields u require.
As you r not having value to the field BDTER, you can pass a range or select-options for this field which has empty valuee.
Regards,
Satya
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Edited by: Earthlink on Nov 14, 2010 11:31 AM
Edited by: Earthlink on Nov 14, 2010 11:32 AM
Edited by: Earthlink on Nov 20, 2010 12:04 PM
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Contrary to my understanding, the <font face="courier">with_pipeline</font> procedure runs 6 time slower than the legacy <font face="courier">no_pipeline</font> procedure. Am I missing something? Well, we're missing a lot here.
Like:
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If you want to find out what's going on then use a TRACE with wait events.
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HOW TO: Post a SQL statement tuning request - template posting
http://oracle-randolf.blogspot.com/2009/02/basic-sql-statement-performance.html
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;Edited by: riedelme on Jul 16, 2010 7:42 AM -
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Moved to correct forum by moderator
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name1
land1
regio
ktokd
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Please suggest me how to improve the performance of the report.
Thanks,Hi,
1. check whether the SELECT inside the DO statement is required. this shud be the culprit.
2. In the SELECT query avoid using APPENDING CORRESPONDING TABLES caluse. directly populate into another internal table and append it later.
3. check whether the internal table gt_bsis is initial before using FOR ALL ENTRIES in the select query. check if it has duplicate entries too. if it has....delete the duplictaes.
regards,
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1.
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marc~lvorm as lvorm_marc
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2.
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labst umlme insme einme speme retme lvorm
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collector-labst, collector-umlme, collector-insme,
collector-einme, collector-speme, collector-retme,
collector-lvorm)
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WHERE matnr = t_mat-matnr
AND werks = t_mat-werks
AND lgort = lgort-LOW
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the performance of program is dull. It is giving to time out Error
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Regards
Swati namdevfew suggessions:
1. First avoid "corresponding fields of " statement. Use "into table" instead.
2. Use open cursor to fetch data
DATA: s_cursor TYPE cursor.
OPEN CURSOR WITH HOLD s_cursor FOR
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marc~lvorm as lvorm_marc
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ON maramatnr = marcmatnr
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AND werks IN werks
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AND matkl IN matkla
AND ekgrp IN ekgrup
and spart in spart.
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DO.
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TABLE t_mat
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EXIT.
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Edited by: Ravi Kumar Singh on Apr 7, 2008 11:07 AM -
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15 UPDATE IMPO.REPCUSTOMERSLUCK24
14 FILTER
2 TABLE ACCESS BY INDEX ROWID TABLE (TEMP) IMPO.REPCUSTOMERSLUCK24 Cost: 1 Bytes: 1.171 Cardinality: 1
1 INDEX RANGE SCAN INDEX IMPO.FK_1883_REPCUSTOMERSLUCK24 Cost: 1 Cardinality: 1
13 FILTER
12 SORT GROUP BY NOSORT Cost: 0 Bytes: 2.212 Cardinality: 1
11 NESTED LOOPS
9 NESTED LOOPS Cost: 0 Bytes: 2.212 Cardinality: 1
7 NESTED LOOPS Cost: 0 Bytes: 1.685 Cardinality: 1
4 TABLE ACCESS BY INDEX ROWID TABLE (TEMP) IMPO.REPCONTRACTSLUCK24 Cost: 0 Bytes: 1.158 Cardinality: 1
3 INDEX FULL SCAN INDEX IMPO.FK_1875_REPCONTRACTSLUCK24 Cost: 0 Cardinality: 1
6 TABLE ACCESS BY INDEX ROWID TABLE CRM2.MEDIACODE Cost: 0 Bytes: 527 Cardinality: 1
5 INDEX UNIQUE SCAN INDEX (UNIQUE) CRM2.AK_1970_MEDIACODE Cost: 0 Cardinality: 1
8 INDEX UNIQUE SCAN INDEX (UNIQUE) CRM2.PK_1955_PARTNER Cost: 0 Cardinality: 1
10 TABLE ACCESS BY INDEX ROWID TABLE CRM2.PARTNER Cost: 0 Bytes: 527 Cardinality: 1
any suggestions to my problem ?
Ikrischerhi,
dynamic sampling is read only a part of the table to make an estimatation (generally count the number of rows, or get an average (if the sample is 'large' enough' for the result to be reliable) etc.
So in you case you could evaluate the number of row like this (the explain plans show you that the estimated cost is propotional to the size of the sample read (either expressed in # of rows or block)).
SQL*Plus: Release 10.2.0.2.0 - Production on Thu Jun 17 15:32:43 2010
Copyright (c) 1982, 2005, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining options
SQL> CREATE GLOBAL TEMPORARY TABLE XTEST
2 (
3 NUM1 NUMBER NOT NULL
4 )
5 ON COMMIT PRESERVE ROWS
6 NOCACHE
7 /
Table created.
SQL> INSERT INTO xtest
2 SELECT ROWNUM
3 FROM DUAL
4 CONNECT BY ROWNUM <= 100000;
100000 rows created.
SQL> commit;
Commit complete.
SQL> EXEC dbms_stats.gather_table_stats(ownname=>user,tabname=>'XTEST');
PL/SQL procedure successfully completed.
SQL> EXPLAIN PLAN SET STATEMENT_ID = 'st1' FOR SELECT COUNT(*)*10 FROM xtest SAMPLE(10);
Explained.
SQL> EXPLAIN PLAN SET STATEMENT_ID = 'st2' FOR SELECT COUNT(*)*1.1 FROM xtest SAMPLE(90);
Explained.
SQL> set linesize 120;
SQL> SELECT PLAN_TABLE_OUTPUT FROM TABLE(DBMS_XPLAN.DISPLAY(NULL,'st1','TYPICAL'));
PLAN_TABLE_OUTPUT
Plan hash value: 2221487120
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 4 | 31 (26)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 4 | | |
| 2 | TABLE ACCESS SAMPLE| XTEST | 10077 | 40308 | 31 (26)| 00:00:01 |
9 rows selected.
SQL> SELECT PLAN_TABLE_OUTPUT FROM TABLE(DBMS_XPLAN.DISPLAY(NULL,'st2','TYPICAL'));
PLAN_TABLE_OUTPUT
Plan hash value: 2221487120
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 4 | 32 (29)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 4 | | |
| 2 | TABLE ACCESS SAMPLE| XTEST | 90693 | 354K| 32 (29)| 00:00:01 |
9 rows selected.
SQL> Note the difference of rows/bytes in both samples, but be carrefull because the explain plan only gives you an estimation ...
REM: If you sample by blocks, you'll get less 'IO' (physical or not) (select count(*)1.5 from mytable sample block (50) is costless thans elect count(*)1.5 from mytable sample (50)) ... -
Is there a recommended limit on the number of custom sections and the cells per table so that there are no performance issues with the UI?
Thanks Kelly,
The answers would be the following:
1200 cells per custom section (NEW COUNT), and up to 30 custom sections per spec.
Assuming all will be populated, and this would apply to all final material specs in the system which could be ~25% of all material specs.
The cells will be numeric, free text, drop downs, and some calculated numeric.
Are we reaching the limits for UI performance?
Thanks -
Performance issues with version enable partitioned tables?
Hi all,
Are there any known performance issues with version enable partitioned tables?
Ive been doing some performance testes with a large version enable partitioned table and it seems that OCB optimiser is choosing very expensive plans during merge operations.
Tanks in advance,
Vitor
Example:
Object Name Rows Bytes Cost Object Node In/Out PStart PStop
UPDATE STATEMENT Optimizer Mode=CHOOSE 1 249
UPDATE SIG.SIG_QUA_IMG_LT
NESTED LOOPS SEMI 1 266 249
PARTITION RANGE ALL 1 9
TABLE ACCESS FULL SIG.SIG_QUA_IMG_LT 1 259 2 1 9
VIEW SYS.VW_NSO_1 1 7 247
NESTED LOOPS 1 739 247
NESTED LOOPS 1 677 247
NESTED LOOPS 1 412 246
NESTED LOOPS 1 114 244
INDEX RANGE SCAN WMSYS.MODIFIED_TABLES_PK 1 62 2
INDEX RANGE SCAN SIG.QIM_PK 1 52 243
TABLE ACCESS BY GLOBAL INDEX ROWID SIG.SIG_QUA_IMG_LT 1 298 2 ROWID ROW L
INDEX RANGE SCAN SIG.SIG_QUA_IMG_PKI$ 1 1
INDEX RANGE SCAN WMSYS.WM$NEXTVER_TABLE_NV_INDX 1 265 1
INDEX UNIQUE SCAN WMSYS.MODIFIED_TABLES_PK 1 62
/* Formatted on 2004/04/19 18:57 (Formatter Plus v4.8.0) */
UPDATE /*+ USE_NL(Z1) ROWID(Z1) */sig.sig_qua_img_lt z1
SET z1.nextver =
SYS.ltutil.subsversion
(z1.nextver,
SYS.ltutil.getcontainedverinrange (z1.nextver,
'SIG.SIG_QUA_IMG',
'NpCyPCX3dkOAHSuBMjGioQ==',
4574,
4575
4574
WHERE z1.ROWID IN (
(SELECT /*+ ORDERED USE_NL(T1) USE_NL(T2) USE_NL(J2) USE_NL(J3)
INDEX(T1 QIM_PK) INDEX(T2 SIG_QUA_IMG_PKI$)
INDEX(J2 WM$NEXTVER_TABLE_NV_INDX) INDEX(J3 MODIFIED_TABLES_PK) */
t2.ROWID
FROM (SELECT /*+ INDEX(WM$MODIFIED_TABLES MODIFIED_TABLES_PK) */
UNIQUE VERSION
FROM wmsys.wm$modified_tables
WHERE table_name = 'SIG.SIG_QUA_IMG'
AND workspace = 'NpCyPCX3dkOAHSuBMjGioQ=='
AND VERSION > 4574
AND VERSION <= 4575) j1,
sig.sig_qua_img_lt t1,
sig.sig_qua_img_lt t2,
wmsys.wm$nextver_table j2,
(SELECT /*+ INDEX(WM$MODIFIED_TABLES MODIFIED_TABLES_PK) */
UNIQUE VERSION
FROM wmsys.wm$modified_tables
WHERE table_name = 'SIG.SIG_QUA_IMG'
AND workspace = 'NpCyPCX3dkOAHSuBMjGioQ=='
AND VERSION > 4574
AND VERSION <= 4575) j3
WHERE t1.VERSION = j1.VERSION
AND t1.ima_id = t2.ima_id
AND t1.qim_inf_esq_x_tile = t2.qim_inf_esq_x_tile
AND t1.qim_inf_esq_y_tile = t2.qim_inf_esq_y_tile
AND t2.nextver != '-1'
AND t2.nextver = j2.next_vers
AND j2.VERSION = j3.VERSION))Hello Vitor,
There are currently no known issues with version enabled tables that are partitioned. The merge operation may need to access all of the partitions of a table depending on the data that needs to be moved/copied from the child to the parent. This is the reason for the 'Partition Range All' step in the plan that you provided. The majority of the remaining steps are due to the hints that have been added, since this plan has provided the best performance for us in the past for this particular statement. If this is not the case for you, and you feel that another plan would yield better performance, then please let me know and I will take a look at it.
One suggestion would be to make sure that the table was been recently analyzed so that the optimizer has the most current data about the table.
Performance issues are very hard to fix without a reproducible test case, so it may be advisable to file a TAR if you continue to have significant performance issues with the mergeWorkspace operation.
Thank You,
Ben
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