Mandatory criteria of selection / performance impact

Dear Sap Gurus,
I have heared that using mandatory criteria of selection could be usefull to improve performance queries.
Why ?! probably to go throw the index, and therefore optimize database access time ....
If somebody could tell me more about this topics it will be great !!!

hi,
check sap course bw360, correctly defined selection order may improve query performance, drop index may have negative impact to query performance
... from bw360 ...
Indexes on tables can help to improve the reading performance for all types of reading described above.
The order of the key fields determines the order of the fields for the primary index. The fields most frequently used for selection should be first in the order.
Additional indexes can be defined for other reading accesses, for example:
Calendar month for selective deletion / archiving
Sales Document number for reporting
In transaction DB05, you can determine the selectivity (distinct values) of table fields (single fields as well as fields in combination) and the distribution of field values. This information helps to define suitable indexes.
for query performance, take a look
oss note
557870 'FAQ BW Query Performance'
and 567746 'Composite note BW 3.x performance Query and Web'.
Prakash weblog for good query design
/people/prakash.darji/blog/2006/01/27/query-creation-checklist
/people/prakash.darji/blog/2006/01/26/query-optimization
BW Performance Tuning Knowledge Center - SAP Developer Network (SDN)
Business Intelligence Performance Tuning [original link is broken]
hope this helps.

Similar Messages

Performance Impact When Using SNC Communication

Hello,
Does anybody know if and how much performance impact there is if we use SNC for communication between the SAP Server and SAPGUI?
I think there are two areas that may be impacted; Network and server CPU.
For network load, I did find a part in "Front-End Network Requirements for SAP Business Solutions" document saying "overhead of roughly 350 bytes per user interaction step" but it does not specify the type of encryption. I wonder if there is any other info on this?
For CPU impact, how much overhead should I consider for sapgui access?
I see no field for this in the quicksizer and I can't seem to find any white papers on this subject.
Thank you in advance.

>
Peter Adams wrote:
> Ken,
>
> if you plan to use SAPcryptlib for SNC between SAP servers, then you should use a SAPcryptolib-compatible solution for the SNC communication between SAPGUI and SAP server, and there is only one vendor who can provide this. Let me know, if you need help finding it. My contact information is in my SDN business card.
Just so Kan is clear - It is not legal to use the SAP cryptolib provided by SAP for SNC between SAP GUI and SAP servers, so if x.509 is the desired mechanism you need to purchase additional software from the company which Peter works for to provide SAP GUI SNC-based SSO. I think instead, Kan might be using the free SAP supplied SNC Kerberos library, which is why I asked him to confirm this in my last post. I doubt he is interested to buy any third party software.
> As to the performance discussion: first of all, yes, there will be a small performance impact if SNC is used (no matter which type or implementation), but from our experience with many actual SNC implementations, I can state that this is practically not relevant. It is not noticeable by users. There were never any performance discussions with customers. See also SAP Note 1043694.
I agree with this - the performance impact is not noticed by users, but the system managers who look after the servers where SAP is installed, and the team responsible for the network need to be aware of any differences (if any) when SNC is turned on and when SNC is turned off. I think this is why Kan is asking these questions, not because he is concerned about users noticing any difference when they logon to SAP.
> Just a first quick comment on certain statements above: Tim's arguments for proving his overall statement are not conclusive from my perspective. Nor do I think his overall statement itself is correct.
The facts I mentioned are well known facts, e.g. symmetric crypto is far better from performance point of view than asymmetric. I know the examples I have shown which I found when doing a quick google search were not conclusive, but they were shown as initial examples, not necessarily the best examples. This is why I specifically mentioned that if you search in google yourself you will see many more references where comparisons are done between Kerberos (e.g. symmatric) compared with PKI (e.g. asymmetric).
> First of all, he only selects one aspect of performance - CPU impact of encryption algorithms.
No, I didn't. Some of the examples I referred to also discuss other differences. I also mentioend other differences such as memory and what protection level is used when configuring SNC.
> But for a true comparison, you'd have to look at all relevant aspects (latency, network overhead, ...).
Yes, I agree. No doubts here.
>Network performance overhead is usuallly worse with Kerberos than with PKI.
This is not true. When SAP is using SNC, the GSS-API standard is used and so the only network communication involves SAP software sending a standard GSS token from the workstation to the SAP server, and this GSS token is often about the same size, regardless of which mechanism is used, so any network performance differences are not related to the mechanism, but more related to the complexity of the cryptography used on each end (mostly on the server side).
>Second, you need to look at the specific usage scenario. For example, the first report referenced by Tim is an analysis about different Token Profile mechanism for WS Security, for one specific implementation. This does not allow to draw any conclusion for the SNC use case in general, and for sure not for a specific implemenation. It does not take the overhead for the encryption of the message content into account. Third, Tim associates PKI exclusively with asymmetric encryption. Yes, it is well known that asymmetric algorithms are slower than symmetric ones, but it is also well known that the encryption of the message content (by far the majority of the data) happens with symmetric encryption algorithms in the PKI scenario. With PKI-based SNC, you can even select a symmetric algorithm and use a more performant one that the ones that Kerberos prescribes.
Kerberos works with many different symmetric algorithms as well, so mentioning that the alg is selectable is not relavent to any comparison.
> To summarize, I will try and collect facts that will support the opposite point of view. From our practical experience, the performance overhead is not relevant, and criteria like consistency with SAPcryptolib, strength of security, ease of administration, choice of authentication and encryption mechanism, etc. are much more important.
>
> Peter

Performance impact related to workbook

Hi All,
Please let me know the performance impact on workbooks if i insert 13 work sheets,
How much performance impact will be there?
If i insert all reports reports in 2 worksheets by splitting them,
How much performance impact ll be there?
Please let me know which one is better way
Urgent!...
Thanks,
Sarau

Hello Sarau,
The performance is purely based on the Query selection, since that decide the number of records to be fetched.
The more you filter the query the performance will be better.
Since you are having many queries in a workbook, make sure that all have common variable screen.
Thanks
Chandran

Performance Impact with OR concatenation / Inlist Iterator

Hello guys,
is there any performance impact with using OR concatenations or some IN-Lists?
The function of both is the "same":
1) Concatenation (OR-processing)
SELECT * FROM emp WHERE mgr# = 1 OR job = ‘YOURS’;- Similar to query rewrite into 2 seperate queries
- Which are then ‘concatenated’
2) Inlist Iterator
SELECT * FROM dept WHERE d# in (10,20,30);- Iteration over enumerated value-list
- Every value executed seperately
- Same as concatenation of 3 “OR-red” values
So i want to know if there is any performance impact if using IN-Lists instead of OR concatenations.
Thanks and Regards
Stefan

The note is very misleading and far from complete; but there is one critical point of difference that you need to observe. It's talking about using a tablescan to deal with an IN-list (and that's NOT "in-list iteration"), my comments start by saying "if there is a suitable indexed access path."
The note, by the way, describes a transformation to a UNION ALL - clearly that would be inefficient if there were no indexed access path. (Given the choice between one tablescan and several consecutive tablescans, which option would you choose ?).
The note, in effect, is just about a slightly more subtle version of "why isn't oracle using my index". For "shorter" lists you might get an indexed iteration, for "longer" lists you might get a tablescan.
Remember, Metalink is not perfect; most of it is just written by ordinary people who learned about Oracle in the normal fashion.
Quick example to demonstrate the difference between concatenation and iteration:
drop table t1;
create table t1 as
select
     rownum     id,
     rownum     n1,
     rpad('x',100)     padding
from
     all_objects
where
     rownum <= 10000
create index t1_i1 on t1(id);
execute dbms_stats.gather_table_stats(user,'t1')
set autotrace traceonly explain
select
     /*+ use_concat(t1) */
     n1
from
     t1
where
     id in (10,20,30,40,50,60,70,80,90,100)
set autotrace offThe execution plan I got from 8.1.7.4 was as follows - showing the transformation to a UNION ALL - this is concatenation and required 10 query block optimisations (which were all done three times):
Execution Plan
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=20 Card=10 Bytes=80)
   1    0   CONCATENATION
   2    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
   3    2       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
   4    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
   5    4       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
   6    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
   7    6       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
   8    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
   9    8       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
10    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
11   10       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
12    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
13   12       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
14    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
15   14       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
16    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
17   16       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
18    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
19   18       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)
20    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=2 Card=1 Bytes=8)
21   20       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=1)This is the execution plan I got from 9.2.0.8, which doesn't transform to the UNION ALL, and only needs to optimise one query block.
Execution Plan
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3 Card=10 Bytes=80)
   1    0   INLIST ITERATOR
   2    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=3 Card=10 Bytes=80)
   3    2       INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=2 Card=10)Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk

Performance impact on oracle 11g database by audit enable

Hi All,
Shall we enable audit on some siebel db tables like s_party s_contacts s_order s_quote s_org_ext
We need to see who deleted account records from oracle tables manually
Since auditing is not enabled.
We have given delete privelege to to all users as required by Siebel application.
So Is this good idea to get Auditing enabled on these selected tables or Is there any performance impact on database.
Is it good idea to enable audit for these tables espacially in siebel
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for HPUX: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

Hello,
Ok do it and generate AWR to see how the performance is getting impacted.remember auditing just some tables is not a big matter but auditing everything is the problem that is why fine grained auditing exist.please also remember to clean the audit records regularly because the auditing will be just a problem with the space in case you have many deletes which should not happen in your case.
Kind regards
Mohamed

Queries Performance impact

Hi Team,
          We have few queries which were running good until last week; but for the past 3 days these queries were facing severe some performance issues and timeout dumps in the back-end.
For some selections it is running long and for some selection it is executing quicker and for some selection it is getting time out.
We made a complete data rebuild for the queries connected data targets (data rebuild from the source) before 3 days; after which the query performance issue faced.
No changes were made to the queries or objects for the last 2 months.
Data Flow - Query -> Multi Provider -> Infoset -> InfoCube -> DSO -> Datasource (DB Connect).
Note:
In Query we have nested aggregation to handle the result rows; but again no changes to it for the past 2 months.
We have loaded data in one single request at the InfoCube level.
          I mean some 2 million records with different plants in one single request do it have performance impact while reading data?
Can anyone please throw light on the possible cause for the performance issue?
Thanks
Regards
San

Hi San,
As you said that you completely loaded data and then only your performance issues started, can you please tell whether you are using any BIA for reporting?.
If not BIA, can you please delete the DB staticstics for those Infocubes and then create the DB statistics for the same.
Also you completely rebuild the data which means drop and reload, your PSATEMPSPACE OR your temporarrily file space   might have completely build. Ask your basis team to check the space in the tables.
Regards,
Rajesh

Constant Selection - Performance hit ?

Hi,
I would like to know about the effect of using 'constant selection' on query performance?
I have a resricted key figure, restricted by 6-7 characteristics, with 'constant selection' marked for all of these. I have about 10 RKFs like this in the query definition.
How does this affect the performance. I read somewhere, but dont remember, that infact it slows down...Would like to hear what experts in there think about this.
Thanks alot
Gova

With Constant Selection, the restrictions in the key figure are NOT affected by the navigation and filters.
Shooting from the hip, I would say performance impact really depends on the restrictions of your constant selection vs other navigations/filters.
If your constant selection restrictions are much less restrictive than other navigations/filters, the query has to read the larger amount of data to satisfy the constants, e.g. you query a particular Bus Area, but RKFs with constant selection do NOT include the Bus Area filtering, the query will have to read all Bus Areas.

Rec/client parameter & Performance Impact

Hi all,
We have been asked by our audit team to set the parameter Rec/client=300 (our production client) in our production system.
But when we read few forums & notes, we feel that setting this parameter Rec/client=300 will definetly impact the performance.
So before setting this parameters we need to evaluate the performance impact in our ECC 6.0 system by setting this parameter, can anyone help us to evaluate the performace impact of this parameter settings in our below system
- ECC 6.0 / oracle 10g / HPUX - 64 bit / 3500 users / 2.5 terabyte data
Thanks
Senthil

Hello
Normally only customizing tables should have the logging flag. You can verify it in SE13 -> <table> -> Log data changes.
To list all tables with logging on, you can use this select statement:
SQL> select tabname, protokoll from sapr3.dd09l where protokoll = 'X';
As long as only so called customizing tables are logged, you should be fine. If you have some heavy traffic Z* tables, then two things might happen:
- performance might suffer
- the logging table DBTABLOG will explode
So please make sure only the necessary tables are logged and if possible test on the QAS system, if the logging leads to performance problems.
Best regards
Michael

Performance impact of using Web Services?

As BEA and other vendors continue to add Web Services support
to their enterprise software, what is your plan for
quantifying the performance impact and the functional
correctness of using web services before going live with the
final application?
Empirix is hosting a free one hour web event discussion on
web services testing and automated web services testing
solutions on Thursday, January 17, 2-3pm Eastern time.
To sign-up for this web event or learn about other web
events being offering by Empirix this month, go to:
http://webevents.empirix.com
For your convenience, here is the complete abstract:
The advent of web services has brought the promises of
integrating multiple software applications from
heterogeneous networks and for exchanging information
from vendor-to-vendor or vendor-to-consumer in a
standardized way.
As web service technologies are deployed within and across
organizations over the next several years, it will be
critical that web services undergo performance testing.
As with any enterprise software project, the adoption of
proper test methodologies and use of testing tools will
play a key part in the overall success or failure of
projects utilizing web services. In a compressed
software project schedule, an organization must
quickly determine if its web services will operate
successfully under a variety of load conditions. Like other
web-based technologies, successful web services will need
to respond quickly and correctly when implemented.
During our presentation, we will discuss the testing
challenges created by this emerging technology, along with
the variety of testing solutions available. Automated
web service testing will be discussed and demonstrated
using FirstACT, the first web services performance testing solution available
on the market. Using a sample web
service, automatic test case creation, scalability testing,
and results analysis will be explored.
If you wish to download FirstACT prior to the web event, you can do so at:
http://www.empirix.com/downloads/FirstACT

As BEA and other vendors continue to add Web Services support
to their enterprise software, what is your plan for
quantifying the performance impact and the functional
correctness of using web services before going live with the
final application?
Empirix is hosting a free one hour web event discussion on
web services testing and automated web services testing
solutions on Thursday, January 17, 2-3pm Eastern time.
To sign-up for this web event or learn about other web
events being offering by Empirix this month, go to:
http://webevents.empirix.com
For your convenience, here is the complete abstract:
The advent of web services has brought the promises of
integrating multiple software applications from
heterogeneous networks and for exchanging information
from vendor-to-vendor or vendor-to-consumer in a
standardized way.
As web service technologies are deployed within and across
organizations over the next several years, it will be
critical that web services undergo performance testing.
As with any enterprise software project, the adoption of
proper test methodologies and use of testing tools will
play a key part in the overall success or failure of
projects utilizing web services. In a compressed
software project schedule, an organization must
quickly determine if its web services will operate
successfully under a variety of load conditions. Like other
web-based technologies, successful web services will need
to respond quickly and correctly when implemented.
During our presentation, we will discuss the testing
challenges created by this emerging technology, along with
the variety of testing solutions available. Automated
web service testing will be discussed and demonstrated
using FirstACT, the first web services performance testing solution available
on the market. Using a sample web
service, automatic test case creation, scalability testing,
and results analysis will be explored.
If you wish to download FirstACT prior to the web event, you can do so at:
http://www.empirix.com/downloads/FirstACT

Performance impact of Web Services

As WebLogic adds support for Web Services to its platform, what is
your plan for quantifying the performance impact and the functional
correctness of using web services before going live with the final
application.
Empirix is hosting a free one hour web event discussion on web
services testing and automated web services testing solutions on
Thursday, January 17, 2-3pm Eastern time.
To register for this web event or learn about other web events being
offering by Empirix this month, go to:
http://webevents.empirix.com
The complete abstract is below:
The advent of web services has brought the promises of integrating
multiple software applications from heterogeneous networks and for
exchanging information from vendor-to-vendor or vendor-to-consumer in
a standardized way.
As web service technologies are deployed within and across
organizations over the next several years, it will be critical that
web services undergo performance testing. As with any enterprise
software project, the adoption of proper test methodologies and use of
testing tools will play a key part in the overall success or failure
of projects utilizing web services. In a compressed software project
schedule, an organization must quickly determine if its web services
will operate successfully under a variety of load conditions. Like
other web-based technologies, successful web services will need to
respond quickly and correctly when implemented.
During our presentation, we will discuss the testing challenges
created by this emerging technology, along with the variety of testing
solutions available. Automated web service testing will be discussed
and demonstrated using FirstACT, the first web services performance
testing solution available on the market. Using a sample web service,
automatic test case creation, scalability testing, and results
analysis will be explored.

Hi,
We test several frameworks and find out that usually JAXB 2.0 performs better than XMLBeans, but that is not a strict rule.
Regards,
LG

Index creation online - performance impact on database

hi,
I have oracle 11.1.0.7 database running on Linux as 3 node RAC.
I have a huge table which has more than 255 columns and is about 400GB in size which is also highly fragmented because of constant DML activities.
Questions:
1. For now i am trying to create an index Online while the business applications are running.
Will there be any performance impact on the database to create index Online on a single column of a table 'TBL' while applications are active against the same table? So basically my question will index creation on a object during DML operations on the same object have performance impact on the database? is there a major performance impact difference in the database in creating index online and not online?
2. I tried to build an index on a column which has NULL value on this same table 'TBL' which has more than 255 columns and is about 400GB in size highly fragmented and has about 140 million rows.
I requested the applications to be shutdown, but the index creation with parallel of 4 a least took more than 6 hours to complete.
We have a Pre-Prod database which has the exported and imported copy of the Prod data. So the pre-Prod is a highly de-fragmented copy of the Prod.
When i created the same index on the same column with NULL, it only took 15 minutes to complete.
Not sure why on a highly fragmented copy of Prod it took more than 6 hours compared to highly defragmented copy of Pre-Prod where the index creation took only 15 minutes.
Any thoughts would be helpful.
Thanks.
Phil.

How are you measuring the "fragmentation" of the table ?
Is the pre-prod database running single instance or RAC ?
Did you collect any workload stats (AWR / Statspack) on the pre-prod and production systems while creating (or failing to create) the index ?
Did you check whether the index creation ended up in-memory, single pass or multi pass in in the two environments ?
The commonest explanation for this type of difference is two-fold:
a) the older data needs a lot of delayed block cleanout, which results in a lot of random I/O to the undo tablespace - slowing down I/O generally
b) the newer end of the table is subject to lots of change, so needs a lot of work relating to read-consistency - which also means I/O on the undo system
-- UPDATED: but you did say that you had stopped the application so this bit wouldn't have been relevant.
On top of this, an online (re)build has to lock the table briefly at the start and end of the build, and in a busy system you can wait a long time for the locks to be acquired - and if the system has been busy while the build has been going on it can take quite a long time to apply the journal file to finish the index build.
Regards
Jonathan Lewis

Performance impact using nested tables and object

Hi,
Iam using oracle 11g.
While creating a package, iam using lot of nested tables created based on objects which will be passed between multiple functions in the package..
Will it have any performance impact since all the data is stored in the memory.
How can i measure the performance impact when the data grows ?
Regards,
Oracle User
Edited by: user9080289 on Jun 30, 2011 6:07 AM
Edited by: user9080289 on Jun 30, 2011 6:42 AM

user9080289 wrote:
While creating a package, iam using lot of nested tables created based on objects which will be passed between multiple functions in the package.. Not the best of ideas in general, in PL/SQL. This is not client code that can lay sole claim to most of the memory. It is server code and one of many server processes that need to share the available resources. So capitalism is fine on a client, but you need socialism on the server? {noformat} ;-) {noformat}
Will it have any performance impact since all the data is stored in the memory.Interestingly yes. Usually crunching data in memory is better. In this case it may not be so. The memory used is the most expensive memory Oracle can use - the PGA. Private process memory. This means each process copy running that code, will need lots of memory.
If you're not passing the data structures by reference, it means even bigger demands on memory as the data structure needs to be copied into the call stack and duplicated.
The worse case scenario is that such code consumes so much free server memory, and make such huge demands on having that in pysical memory, it trashes memory management as the swap daemons are unable to keep up with the demand of swapping virtual memory pages into and out of memory. Most CPU time is spend by the swap daemons.
I have seen servers crash due to this. I have seen a single PL/SQL process causing this.
How can i measure the performance impact when the data grows ?Well, you need to look at the impact of your code on PGA memory. It is not SQL performance or I/O performance that is a factor - just how much private process memory your code needs in order to execute.

Performance impact on the size of the CHM file

Is there any impact on performance depending on the size of a
CHM file?

The main issues people have with help file performance
(regardless of whether it is a CHM file) are related to the number
of images, DHTML hotspots, bookmarks and links they have in a
topic. The number of topics in a CHM should not be an issue. What
exactly are you trying to access the performance impact of?

What is the criteria for selecting a license if multiple licenses exist

Hello experts,
If multiple licenses exist for an order in GTS, what is the criteria to decide which license will finally be selected?
The log says "Number of import/export licenses that could be affected: 3" but it finally picks up one.
Does it do it sequentially using the internal license number?
We have a scenario where we are upgarding from version 7 to version 10, and there is one license (say A) which was created in the older version and copied to the new system after upgrade. There is also a new license (say B) directly created in the new version (with same selection criteria as A)
Now when an order is created, both licenses are "affected" but it picks up the license B created in the new version.
If the system was picking license based on internal number it should have picked up license A which was created in earlier version (as that had a lower internal number sequentially). If I expire license B and recheck the order, then it correctly picks up A.
So what is the actual criteria to select a license and in this case was License A not given priority because it was created in older version and then copied to new version as part of upgrade?

As far as I can see from a quick look at the code, there is no attempt to place the determined licences in any particular order. Since they are selected from table /SAPSLL/LCLIC, it seems reasonable that they would be selected according to field GUID_LCLIC. Within one system, the GUIDs remain in order of creation date/time; however I don't know GUIDs are formed in relation to different systems. My bet is that if you check in SE16, your "early" licence actually has a higher GUID value than the recent ones.
Please check, and see if I'm right.
Regards,
Dave

Regarding performance impact if I do DB accessing coding in comp Controller

Hi ,
This is my project requirement, I have to use some com compoment which in turn fetches data from the database. I am using a java com bridge tool to do this. This tool is generating the java proxy classes for the VB com component.
I am using java proxy classes( This class files are using JNI to connect to VB COM compnent and fetch the data from DB) in my webdynpro component controller.
The architecture is aas below
WEBDYNPRO >> JAVA Classes object( generated by the JAVA- COM bridge tool ) >> JAVA-COM bridge tool >> VB COM+ Component >> SQL server.
The issue
Performance :- first time it is OK but for Consecutive calls the application is going down very visibly and after 4 iteration it hangs . When I look at the log I am getting this
Message : Exception occured during processing of Web Dynpro application com/oreqsrch/com.oreqsrchapp.OReqSrchApp.
The causing exception is nested.
[EXCEPTION]
com.sap.tc.webdynpro.services.session.LockException: Thread SAPEngine_Application_Thread[impl:3]_36 failed to acquire exclusive lock on client session ClientSession(id=(J2EE9536400)ID1120562150DB11245826542790956137End_1159630423). Existing locks: LockingManager(ThreadName:SAPEngine_Application_Thread[impl:3]_36, exclusive client session lock:
ClientSessionLock(SAPEngine_Application_Thread[impl:3]_9), shared client session locks: ClientSessionSharedLockManager([]), app session locks: ApplicationSessionLockManager([]), current request: com/oreqsrch/com.oreqsrchapp.OReqSrchApp).
Hint: Take a thread dump of the server node to find the blocking thread that causes the problem.
Is this issue because I have return the code data access code in the component controller rather wrting in some beans ?
My questions regarding
What would the performance impact if write the DB access code in the webdynpro component controller rather than writing in a bean or an EJB?( I know ideally DB access code has to write in Bean or EJB ).
Please address this with respedct to performance point of view .
thanks
pkiran

Hi Both,
Thanks for the reply.
Yes they are closed and set it to null;
Connection max and mini properties are controlled at COM+ components in VB.
Since I am using COM - JAVA bridge, I am just invoking the methods defined ijn the VB code thru the bridge tool. all the objects which are retrieving the data are closed and nullify it.
My question is
if I write DB access code in component control instead in EJB or Java bean, will there be any performance issue ?
regards
pkiran

Mandatory criteria of selection / performance impact

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