Ajax4JSF Perfomance Issues

Me & my team have used Ajax4JSF extensively in our application very recently we have been observing perfomance problems.
Here is the situation
We have following dropdown defined with ajax4jsf event onchange
<h:panelGrid columns="3" styleClass="detail" columnClasses="label">
                 <h:outputText value="Manufacturer" />
                 <h:selectOneMenu id="manufList" value="#{manufacturerBean.selectedManufacturer}" >
                   <f:selectItem itemLabel="New" itemValue="New" />
              <f:selectItems value="#{manufacturerBean.manufacturerList}" />
              <a4j:support action="#{manufacturerBean.loadManufacturerDetails}" event="onchange" reRender="manufName,manufDescription,manufSource,btnSave,btnDelete" />
           </h:selectOneMenu>
            </h:panelGrid> The perfomance issue is whenever we pick a different value from the dropdown list Ajax4JSF onchange event is fired & the action method "loadManufacturerDetails" is invoked in the backing bean. This is perfect & expected behaviour. But prior to invoking onchange action method it invokes f:selectItems value binding method i.e. getManufacturerList in the backing bean which leads to perfomance issues as it goes thru Spring & Hibernate and hits the database & fires the query to get the List of Manufacturers everytime onchange event occurs & we were very much suprised with the wait time to populates other fields in the form
Any pointers/suggestions will be highly appreciated
Regards
Bansi

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XX_HXC_TIME_BUILDING_BLOCKS_N2     NORMAL                                     NONUNIQUE
HXC_TIME_BUILDING_BLOCKS_N3                     NORMAL                                     NONUNIQUE
XX_HXC_TIME_BUILDING_BLOCKS_N3     FUNCTION-BASED NORMAL     NONUNIQUE
HXC_TIME_BUILDING_BLOCKS_FK1     NORMAL                                     NONUNIQUE
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HXC_TIME_BUILDING_BLOCKS_FK3     NORMAL                                    NONUNIQUE
HXC_TIME_BUILDING_BLOCKS_N1                     NORMAL                                    NONUNIQUE
HXC_TIME_BUILDING_BLOCKS_PK                    NORMAL                                     UNIQUEExplain plan
========
| Id | Operation                                       | Name                          | Rows | Bytes | Cost |
|   0 | SELECT STATEMENT                                |                                |     1 |   548 |   387 |
|   1 | SORT GROUP BY                                  |                                |     1 |   548 |   352 |
|   2 |   FILTER                                        |                                |       |       |       |
|   3 |    NESTED LOOPS                                 |                                |     1 |   548 |   327 |
|   4 |     NESTED LOOPS                                |                                |     1 |   529 |   325 |
|   5 |      NESTED LOOPS                               |                                |     1 |   504 |   323 |
|   6 |       NESTED LOOPS                              |                                |     1 |   461 |   321 |
|   7 |        NESTED LOOPS                             |                                |     1 |   453 |   320 |
|   8 |         NESTED LOOPS                            |                                |     1 |   409 |   319 |
|   9 |          NESTED LOOPS                           |                                |     1 |   386 |   317 |
| 10 |           NESTED LOOPS                          |                                |     1 |   371 |   314 |
| 11 |            NESTED LOOPS                         |                                |     1 |   320 |   144 |
| 12 |             NESTED LOOPS                        |                                |     1 |   308 |   143 |
| 13 |              NESTED LOOPS                       |                                |     1 |   271 |   142 |
| 14 |               NESTED LOOPS                      |                                |     1 |   257 |   141 |
| 15 |                NESTED LOOPS                     |                                |     1 |   249 |   139 |
| 16 |                 NESTED LOOPS                    |                                |     1 |   223 |   127 |
| 17 |                  NESTED LOOPS                   |                                |     1 |   200 |   126 |
| 18 |                   NESTED LOOPS                  |                                |     1 |   192 |   125 |
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| 22 |                      TABLE ACCESS BY INDEX ROWID| PER_ALL_PEOPLE_F               |     1 |   118 |     2 |
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| 26 |                    TABLE ACCESS BY INDEX ROWID | PER_JOBS                       |     1 |    10 |     1 |
| 27 |                     INDEX UNIQUE SCAN           | PER_JOBS_PK                    |     1 |       |       |
| 28 |                   TABLE ACCESS BY INDEX ROWID   | PER_JOB_GROUPS                 |     1 |     8 |     1 |
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| 37 |              TABLE ACCESS BY INDEX ROWID        | FND_ID_FLEX_STRUCTURES_TL      |     1 |    37 |     1 |
| 38 |               INDEX UNIQUE SCAN                 | FND_ID_FLEX_STRUCTURES_TL_U1   |     1 |       |       |
| 39 |             TABLE ACCESS BY INDEX ROWID         | PER_ANALYSIS_CRITERIA          |     1 |    12 |     1 |
| 40 |              INDEX UNIQUE SCAN                  | PER_ANALYSIS_CRITERIA_PK       |     1 |       |       |
| 41 |            TABLE ACCESS BY INDEX ROWID          | HXC_TIME_BUILDING_BLOCKS       |     9 |   459 |   170 |
| 42 |             INDEX RANGE SCAN                    | HXC_TIME_BUILDING_BLOCKS_FK2   |   578 |       |     5 |
| 43 |           TABLE ACCESS BY INDEX ROWID           | HXC_TIME_ATTRIBUTE_USAGES      |     1 |    15 |     3 |
| 44 |            INDEX RANGE SCAN                     | HXC_TIME_ATTRIBUTE_USAGES_FK2 |     1 |       |     2 |
| 45 |          TABLE ACCESS BY INDEX ROWID            | HXC_TIME_ATTRIBUTES            |     1 |    23 |     2 |
| 46 |           INDEX UNIQUE SCAN                     | HXC_TIME_ATTRIBUTES_PK         |     1 |       |     1 |
| 47 |         TABLE ACCESS BY INDEX ROWID             | PA_PROJECTS_ALL                |     1 |    44 |     1 |
| 48 |          INDEX UNIQUE SCAN                      | PA_PROJECTS_U1                 |     1 |       |       |
| 49 |        TABLE ACCESS BY INDEX ROWID              | PA_TASKS                       |     1 |     8 |     1 |
| 50 |         INDEX UNIQUE SCAN                       | PA_TASKS_U1                    |     1 |       |       |
| 51 |       TABLE ACCESS BY INDEX ROWID               | HXC_TIME_BUILDING_BLOCKS       |     1 |    43 |     2 |
| 52 |        INDEX UNIQUE SCAN                        | HXC_TIME_BUILDING_BLOCKS_PK    |     1 |       |     1 |
| 53 |      TABLE ACCESS BY INDEX ROWID                | HXC_TIME_BUILDING_BLOCKS       |     1 |    25 |     2 |
| 54 |       INDEX UNIQUE SCAN                         | HXC_TIME_BUILDING_BLOCKS_PK    |     1 |       |     1 |
| 55 |     TABLE ACCESS BY INDEX ROWID                 | HXC_TIMECARD_SUMMARY           |     1 |    19 |     2 |
| 56 |      INDEX UNIQUE SCAN                          | HXC_TIMECARD_SUMMARY_PK        |     1 |       |     1 |
| 57 |    SORT AGGREGATE                               |                                |     1 |     9 |       |
| 58 |     FIRST ROW                                   |                                |     1 |     9 |     3 |
| 59 |      INDEX RANGE SCAN (MIN/MAX)                 | HXC_TIME_BUILDING_BLOCKS_PK    |    11M|       |     3 |
| 60 |    SORT AGGREGATE                               |                                |     1 |   401 |       |
| 61 |     NESTED LOOPS OUTER                          |                                |     1 |   401 |    26 |
| 62 |      NESTED LOOPS OUTER                         |                                |     1 |   303 |    24 |
| 63 |       NESTED LOOPS OUTER                        |                                |     1 |   205 |    22 |
| 64 |        NESTED LOOPS OUTER                       |                                |     1 |   201 |    22 |
| 65 |         NESTED LOOPS OUTER                      |                                |     1 |   197 |    22 |
| 66 |          NESTED LOOPS OUTER                     |                                |     1 |   193 |    22 |
| 67 |           NESTED LOOPS OUTER                    |                                |     1 |   189 |    22 |
| 68 |            HASH JOIN                            |                                |     1 |   185 |    22 |
| 69 |             NESTED LOOPS                        |                                |     1 |   161 |    19 |
| 70 |              NESTED LOOPS                       |                                |     1 |    35 |    18 |
| 71 |               TABLE ACCESS BY INDEX ROWID       | PER_ALL_ASSIGNMENTS_F          |     1 |    17 |     6 |
| 72 |                INDEX RANGE SCAN                 | PER_ASSIGNMENTS_F_N12          |     3 |       |     2 |
| 73 |               TABLE ACCESS BY INDEX ROWID       | PER_PERSON_ANALYSES            |     1 |    18 |    12 |
| 74 |                INDEX RANGE SCAN                 | PER_PERSON_ANALYSES_N3         |     1 |       |     1 |
| 75 |              TABLE ACCESS BY INDEX ROWID        | PER_ANALYSIS_CRITERIA          |     1 |   126 |     1 |
| 76 |               INDEX UNIQUE SCAN                 | PER_ANALYSIS_CRITERIA_PK       |     1 |       |       |
| 77 |             TABLE ACCESS FULL                   | FND_ID_FLEX_STRUCTURES         |     1 |    24 |     2 |
| 78 |            INDEX UNIQUE SCAN                    | PA_TASKS_U1                    |     1 |     4 |       |
| 79 |           INDEX UNIQUE SCAN                     | PA_TASKS_U1                    |     1 |     4 |       |
| 80 |          INDEX UNIQUE SCAN                      | PA_TASKS_U1                    |     1 |     4 |       |
| 81 |         INDEX UNIQUE SCAN                       | PA_PROJECTS_U1                 |     1 |     4 |       |
| 82 |        INDEX UNIQUE SCAN                        | PA_PROJECTS_U1                 |     1 |     4 |       |
| 83 |       TABLE ACCESS BY INDEX ROWID               | PER_ALL_PEOPLE_F               |     1 |    98 |     2 |
| 84 |        INDEX RANGE SCAN                         | PER_PEOPLE_F_PK                |     1 |       |     1 |
| 85 |      TABLE ACCESS BY INDEX ROWID                | PER_ALL_PEOPLE_F               |     1 |    98 |     2 |
| 86 |       INDEX RANGE SCAN                          | PER_PEOPLE_F_PK                |     1 |       |     1 |
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| 88 |     TABLE ACCESS BY INDEX ROWID                 | PER_ALL_ASSIGNMENTS_F          |     1 |    23 |     6 |
| 89 |      INDEX RANGE SCAN                           | PER_ASSIGNMENTS_F_N12          |     3 |       |     2 |
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05/31/2010 *02:35:25,197* DEBUG persistence.bean.PersistenceService [[ACTIVE] ExecuteThread: '8' for queue: 'weblogic.kernel.Default (self-tuning)':822] - Looking up Person for id 12014
05/31/2010 *02:35:36,272* DEBUG persistence.bean.PersistenceService [[ACTIVE] ExecuteThread: '8' for queue: 'weblogic.kernel.Default (self-tuning)':829] - Found Person Vitasha Harinarine for id 12014
Could somebody please help me debugging this issue? The code has not changed before migrating to 10.3. I have checked that the datasources on both environments are exactly the same.
Any help would be greatly appreciated.
Thanks in advance!
Regards,
Nishtha

Don't do that. The ClassLoader used to manage web components is the child of the classloader used to manage EJB components - the servlet can use EJB classes, the EJB's cannot use web classes.
This is also very poor practice as it couples the business logic layers of you system to the presentation - only the reverse should be done. WLS 6.0 is behaving appropriately.
Chuck

Perfomance issue with SharePoint List.

Current System:
Our application (for submitting and publishing articles) is using WSS 3.0
to store content and host workflows.
Article content like PDFs, Images & Videos are stored in a SharePoint document library.
There is also a list in which we have configured a custom state machine workflow. While creating an list SP item from the UI, instance of the configured workflow instance will be triggered and start monitoring.
Each article belongs to a Journal. We have TBs of data stored in content databases. Initially there was only one site collection (“http://<myweb:8080>/ArtcleLibrary”) and entire article data was storing it the same document library.
Later we decided to split the document library based on journal.
To achieve better scalability, we have now changed the application architecture by creating site collection for each journal and keep article content (there are many articles in a journal) in corresponding site collections. We have added more content databases
and sites collections are equally distributed among these Dbs.
Now it is like (“http://<myweb:8080>/<journalID>/ ArtcleLibrary”)
Actual Problem:
We have achieved scalability in the case of content management by splitting document libraries among different site collections and content databases.
But still the SP list for managing workflow is in the initial site collection (“http://<myweb>:8080/WorkflowTasks”). This single list contains now 60,000 items (=60,000 workflow instances) even if we deleted completed list items older than 3 months.
We have performance issues with the current workflow list. It is taking time (avg 20s) to create/read list item from the SP List. Sometimes items are not getting created in the list item.
From MSDN I came to know than there are recommended count for items in SPList (2000
or 5000 items).
What is the best solution to solve the above performance issue with SharePoint list?
Whether the above mentioned our approach to document library will work for SP list also (means split current SP List and keep in each Journal site collection)?
Please advise.

Hi Andrew,
Thanks for your post.
I still have some doubts.
If we go like this, will OWSTIMER be able to handle workflows (custom workflow is attached to SP List) of these many site collections. We have now more than 600 site collections.

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Part of the system is a lightweight machine with a 400Mhz VIA Eden and 256 MB memory. During startup the machine has a lot of trouble with the back buffer issue, and it lasts for about 10 min and then the machine runs smoothly for the rest of the period. The GUI is still responsive during startup if you know were to push, but it`s not usable because of the gray rectangles. Is there any way that I can optimize the JVM faster, so it starts running more smoothly sooner? I`m already using -Xincgc. This is a real-time system, so performance is really important
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Hi Gurus,
I am using the FM CONVERSION_EXIT_ABPSP_INPUT in my user exit to convert WBS element(POSID's - 24 char) to PSPNR (8 char).It is being inside a loop which causes performance issues.I want to convert all the POSID's in my internal table to PSPNR at one shot without using the loop statement.Is it possible?
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HI,
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We purchased 4 SRW2024P Gigabit switches to replace our old fast ethernet switches. When testing them in a small network I found a strange behavior regarding mixed operation of gigabit and fast ethernet: File transfers from gigabit to fast ethernet (100Mbps full duplex) connected computers are far to slow, sometimes below 1 Mbps. Gigabit to gigabit was very fast as expected and 100 to 100 Mbps also was about the expected speed.
Then I found that the bad performance in mixed operation can be fixed by enabling flow control on any single port (even a non-connected).
Has anybody encountered a similar behavior with this or another switch?

I purchased 6 of these back in September, and if I could turn back the clock I wouldn't make the same mistake twice!
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