topic Re: BDC in Application Development and Automation Discussions

BDC

Former Member — Wed, 25 Apr 2007 04:29:48 GMT

What are the measures to improve performance in BDC Reports ?

Re: BDC

Former Member — Wed, 25 Apr 2007 04:32:50 GMT

Hi Kumar,

Follow the steps mentioned for better performance:

1) Don’t use nested select statement

2) If possible use for all entries in addition

3) In the where addition make sure you give all the primary key

4) Use Index for the selection criteria.

5) You can also use inner joins

6) You can try to put the data from the first select statement into an Itab and then in order to select the data from the second table use for all entries in.

7) Use the runtime analysis SE30 and SQL Trace (ST05) to identify the performance and also to identify where the load is heavy, so that you can change the code accordingly

Check these links

https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/5d0db4c9-0e01-0010-b68f-9b1408d5f234

/people/hema.rao/blog/2006/09/25/performance-tuning--an-overlooked-activity

/people/rob.burbank/blog/2007/03/19/joins-vs-for-all-entries--which-performs-better

Hope this resolves your query.

Reward all the helpful answers.

Regards

Re: BDC

Former Member — Wed, 25 Apr 2007 04:39:01 GMT

Hi,

Tools available in SAP to pin-point a performance problem

The runtime analysis (SE30)

SQL Trace (ST05)

Tips and Tricks tool

The performance database

Optimizing the load of the database

Using table buffering

Using buffered tables improves the performance considerably. Note that in some cases a stament can not be used with a buffered table, so when using these staments the buffer will be bypassed. These staments are:

Select DISTINCT

ORDER BY / GROUP BY / HAVING clause

Any WHERE clasuse that contains a subquery or IS NULL expression

JOIN s

A SELECT... FOR UPDATE

If you wnat to explicitly bypass the bufer, use the BYPASS BUFFER addition to the SELECT clause.

Use the ABAP SORT Clause Instead of ORDER BY

The ORDER BY clause is executed on the database server while the ABAP SORT statement is executed on the application server. The datbase server will usually be the bottleneck, so sometimes it is better to move thje sort from the datsbase server to the application server.

If you are not sorting by the primary key ( E.g. using the ORDER BY PRIMARY key statement) but are sorting by another key, it could be better to use the ABAP SORT stament to sort the data in an internal table. Note however that for very large result sets it might not be a feasible solution and you would want to let the datbase server sort it.

Avoid ther SELECT DISTINCT Statement

As with the ORDER BY clause it could be better to avoid using SELECT DISTINCT, if some of the fields are not part of an index. Instead use ABAP SORT + DELETE ADJACENT DUPLICATES on an internal table, to delete duplciate rows.

Rgds,

P.Nag

Re: BDC

Former Member — Wed, 25 Apr 2007 04:41:51 GMT

Hi ,

I am askin with respect to BDC how can we improve perfromance Like using Session or transaction....How ?

Re: BDC

Former Member — Wed, 25 Apr 2007 04:48:06 GMT

Hi kumar,

check out in this link, u can find the ways to improve performance to BDC.

http://help.sap.com/saphelp_47x200/helpdata/en/e1/8e51341a06084de10000009b38f83b/frameset.htm