Excessive database calls from DMZ portal as opposed to from internal portal

Ever since our upgrade from 5.0.4 to ALUI 6.1 MP1, our extranet server in the DMZ is very slow to load. (36 seconds per page.) In the spy, all of the calls to the database are made repeatedly as if they are looping. When the page has completely loaded, you can still all the same calls being made to the database in the spy.
When this box is brought from the DMZ into the LAN, it operates correctly and you only see the calls to the database the one time. All of the necessary ports are open in the firewall.
Does anyone have any ideas? There are no errors in the log, just the continues looping of SELECT statements, etc.

Hi ,
As Simon pointed in previous reply , DB should not be directly updated. It should be via components which use API delivered. I haven't come across where shuch functionality is required . If the DB is allowed to updated directly , then there is a possibilty where the end user's action may corrupt the DB.
Thanks
Nishant

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Hi all, I'm new to the forums and I desperately need some help!
My question fits into the RMI category but also the database/GUI side so sorry if this is posted in the wrong place.
My application is a client/server system (programmed in Netbeans 6.8) that also uses GUIs and JDBC-ODBC. Basically, I am trying to call a method that adds an entry to my database from a GUI button.
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private void addUserActionPerformed(java.awt.event.ActionEvent evt) {
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Edited by: DHD on Feb 26, 2010 6:15 AM

Would I have to make the GUI class extend the interface too?Your GUI has nothing to do with the RMI. How did you obtaint the "server" ? have you looked in the RMI registry to get the stub object ?
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[http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html|java Doc SwingWorker sample usage]
You mentioned that the RMI method invocation works fine from the main class and not from the GUI so what did you do in the main class to get the stub do it in the doInBackground() method
Regards,
Alan
London

Calling a Stored Procedure with output parameters from Query Templates

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1. Stored Procedure is defined in a package. Procedure takes the below inputs and outputs.
a) Input1 - CLOB
b) Input2 - CLOB
c) Input3 - CLOB
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6. So the method 2-a is ruled out.
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Rajesh,
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Package:
type return_cur IS ref CURSOR;
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DECLARE
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BEGIN
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Michael

How do I run a database procedure that inserts data into a table from withi

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How to optimize Database Calls to improve performance of an application

Hi,
I have a performance issue with my applications. It takes a lot of time to load, as it is making several calls to the database. And, moreover, the resultset has more than 2000 records that are returned. I need to know what is the better way to improve the performance
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2. Stored procedures are a good way to get the data from the result set iteratively. How can I implement this solution in Java?
This is very important, and any help is greatly appreciated.
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latha_kaps wrote:
I have a performance issue with my applications. It takes a lot of time to load, as it is making several calls to the database. And, moreover, the resultset has more than 2000 records that are returned. I need to know what is the better way to improve the performance
1. What is the solution to optimize the database calls so that I can improve the performance of my application and also improve on the trun around time to load the web pages.
2. Stored procedures are a good way to get the data from the result set iteratively. How can I implement this solution in Java?
This is very important, and any help is greatly appreciated.1. 2000 records inside a resultset are not a big number.
2. Which RDBMS you use?
Concerning the answer to 2. you have different possibilities. The best thing is always to handle as many transactions as possible inside the database. Therefore a stored procedure is the best approach imho.
Below there is an example for an Oracle RDBMS.
Assumption #1 you have created an object (demo_obj) in your Oracle database:
create type demo_obj as object( val1 number, val2 number, val3 number);
create type demo_array as table of demo_obj;
/Assumption #2 you've created a stored function to get the values of the array in your database:
create or replace function f_demo ( p_num number )
return demo_array
as
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begin
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    bulk collect into l_array
      from all_objects
     where rownum <= p_num;
    return l_array;
end;
/For getting the data out of database use the following Java program (please watch the comments):
import java.sql.*;
import java.io.*;
import oracle.sql.*;
import oracle.jdbc.*;
public class VarrayDemo {
     public static void main(String args[]) throws IOException, SQLException {
          DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
          Connection conn = DriverManager.getConnection(
                    "jdbc:oracle:oci:@TNS_ENTRY_OF_YOUR_DB", "scott", "tiger"); // I am using OCI driver here, but one can use thin driver as well
          conn.setAutoCommit(false);
          Integer numRows = new Integer(args[0]); // variable to accept the number of rows to return (passed at runtime)
          Object attributes[] = new Object[3]; // "attributes" of the "demo_obj" in the database
          // the object demo_obj in the db has 3 fields, all numeric
          // create an array of objects which has 3 attributes
          // we are building a template of that db object
          // the values i pass below are just generic numbers, 1,2,3 mean nothing really
          attributes[0] = new Integer(1);
          attributes[1] = new Integer(2);
          attributes[2] = new Integer(3);
          // this will represent the data type DEMO_OBJ in the database
          Object demo_obj[] = new Object[1];
          // make the connection between oracle <-> jdbc type
          demo_obj[0] = new oracle.sql.STRUCT(new oracle.sql.StructDescriptor(
                    "DEMO_OBJ", conn), conn, attributes);
          // the function returns an array (collection) of the demo_obj
          // make the connection between that array(demo_array) and a jdbc array
          oracle.sql.ARRAY demo_array = new oracle.sql.ARRAY(
                    new oracle.sql.ArrayDescriptor("DEMO_ARRAY", conn), conn,
                    demo_obj);
          // call the plsql function
          OracleCallableStatement cs =
               (OracleCallableStatement) conn.prepareCall("BEGIN ? := F_DEMO(?);END;");
          // bind variables
          cs.registerOutParameter(1, OracleTypes.ARRAY, "DEMO_ARRAY");
          cs.setInt(2, numRows.intValue());
          cs.execute();
          // get the results of the oracle array into a local jdbc array
          oracle.sql.ARRAY results = (oracle.sql.ARRAY) cs.getArray(1);
          // flip it into a result set
          ResultSet rs = results.getResultSet();
          // process the result set
          while (rs.next()) {
               // since it's an array of objects, get and display the value of the underlying object
               oracle.sql.STRUCT obj = (STRUCT) rs.getObject(2);
               Object vals[] = obj.getAttributes();
               System.out.println(vals[0] + " " + vals[1] + " " + vals[2]);
          // cleanup
          cs.close();
          conn.close();
}For selecting 20.000 records it takes only a few seconds.
Hth

Are mutliple database calls really significant with a network call for a web API?

At one of my employers, we worked on a REST (but it also applies to SOAP) API. The client, which is the application UI, would make calls over the web (LAN in typical production deployments) to the API. The API would make calls to the database.
One theme that recurs in our discussions is performance: some people on the team believe that you should not have multiple database calls (usually reads) from a single API call because of performance; you should optimize them so that each API call has only
(exactly) one database call.
But is that really important? Consider that the UI has to make a network call to the API; that's pretty big (order of magnitude of milliseconds). Databases are optimized to keep things in memory and execute reads very, very quickly (eg. SQL Server loads and
keeps everything in RAM and consumes almost all your free RAM if it can).
TLDR: Is it really significant to worry about multiple database calls when we are already making a network call over the LAN? If so, why?
To be clear, I'm talking about order of magnitude -- I know that it depends on specifics (machine hardware, choice of API and DB, etc.) If I have a call that takes O(milliseconds), does optimizing for DB calls that take an order of magnitude less, actually
matter? Or is there more to the problem than this?
Edit: for posterity, I think it's quite ridiculous to make claims that we need to improve performance by combining database calls under these circumstances -- especially
with a lack of profiling. However, it's not my decision whether we do this or not; I want to know what the rationale is behind thinking this is a correct way of optimizing web API calls.

But is that really important? Consider that the UI has to make a network call to the API; that's pretty big (order of magnitude of milliseconds). Databases are optimized to keep things in memory
and execute reads very, very quickly (eg. SQL Server loads and keeps everything in RAM and consumes almost all your free RAM if it can).
The Logic
In theory, you are correct. However, there are a few flaws with this rationale:
From what you stated, it's unclear if you actually tested / profiled your app. In other words, do you actually know that
the network transfers from the app to the API are the slowest component? Because that is intuitive, it is easy to assume that it is. However, when discussing performance, you should never assume. At my employer, I am the performance lead. When I first joined,
people kept talking about CDN's, replication, etc. based on intuition about what the bottlenecks must be. Turns out, our biggest performance problems were poorly performing database queries.
You are saying that because databases are good at retrieving data, that the database is necessarily running at peak performance, is being used optimally, and there is nothing that can be done
to improve it. In other words, databases are designed to be fast, so I should never have to worry about it. Another dangerous line of thinking. That's like saying a car is meant to move quickly, so I don't need to change the oil.
This way of thinking assumes a single process at a time, or put another way, no concurrency. It assumes that one request cannot influence another request's performance. Resources are shared,
such as disk I/O, network bandwidth, connection pools, memory, CPU cycles, etc. Therefore, reducing one database call's use of a shared resource can prevent it from causing other requests to slow down. When I first joined my current employer, management believed
that tuning a 3 second database query was a waste of time. 3 seconds is so little, why waste time on it? Wouldn't we be better off with a CDN or compression or something else? But if I can make a 3 second query run in 1 second, say by adding an index, that
is 2/3 less blocking, 2/3 less time spent occupying a thread, and more importantly, less data read from disk, which means less data flushed out of the in-RAM cache.
The Theory
There is a common conception that software performance is simply about speed.
From a purely speed perspective, you are right. A system is only as fast as its slowest component. If you have profiled your code and found that the Internet is the slowest component, then everything else is obviously not the slowest part.
However, given the above, I hope you can see how resource contention, lack of indexing, poorly written code, etc. can create surprising differences in performance.
The Assumptions
One last thing. You mentioned that a database call should be cheap compared to a network call from the app to the API. But you also mentioned that the app and the API servers are in the same LAN. Therefore, aren't both of them comparable as network calls? In
other words, why are you assuming that the API transfer is orders of magnitude slower than the database transfer when they both have the same available bandwidth? Of course the protocols and data structures are different, I get that, but I dispute the assumption
that they are orders of magnitude different.
Where it gets murkey
This whole question is about "multiple" versus "single" database calls. But it's unclear how many are multiple. Because of what I said above, as a general rule of thumb, I recommend making as few database calls as necessary. But that is
only a rule of thumb.
Here is why:
Databases are great at reading data. They are storage engines. However, your business logic lives in your application. If you make a rule that every API call results in exactly one database call, then your business logic may end up in the database. Maybe that
is ok. A lot of systems do that. But some don't. It's about flexibility.
Sometimes to achieve good decoupling, you want to have 2 database calls separated. For example, perhaps every HTTP request is routed through a generic security filter which validates from the DB that the user has the right access rights. If they do, proceed
to execute the appropriate function for that URL. That function may interact with the database.
Calling the database in a loop. This is why I asked how many is multiple. In the example above, you would have 2 database calls. 2 is fine. 3 may be fine. N is not fine. If you call the database in a loop, you have now made performance linear, which means it
will take longer the more that is in the loop's input. So categorically saying that the API network time is the slowest completely overlooks anomalies like 1% of your traffic taking a long time due to a not-yet-discovered loop that calls the database 10,000
times.
Sometimes there are things your app is better at, like some complex calculations. You may need to read some data from the database, do some calculations, then based on the results, pass a parameter to a second database call (maybe to write some results). If
you combine those into a single call (like a stored procedure) just for the sake of only calling the database once, you have forced yourself to use the database for something which the app server might be better at.
Load balancing: You have 1 database (presumably) and multiple load balanced application servers. Therefore, the more work the app does and the less the database does, the easier it is to scale because it's generally easier to add an app server than setup database
replication. Based on the previous bullet point, it may make sense to run a SQL query, then do all the calculations in the application, which is distributed across multiple servers, and then write the results when finished. This could give better throughput
(even if the overall transaction time is the same).
TL;DR
TLDR: Is it really significant to worry about multiple database calls when we are already making a network call over the LAN? If so, why?
Yes, but only to a certain extent. You should try to minimize the number of database calls when practical, but don't combine calls which have nothing to do with each other just for the sake of combining them. Also, avoid calling the database in a loop at all
costs.

Database calls, please suggest

Hi,
I working on j2ee project. I have a requirement like this.
I need to insert a data into one master and one detail table. There will one header record and multiple detail records. I should insert successfully in both the table. If any insert fails I should rollback both the inserts. How can I achieve it. Should I use user transaction or entity bean or stored procedure. IF it is a stored procedure, I can have only one database call and can manage rollback and commit in procedure itself but the drawback is I can not insert variable number of detail records, I will have to use limited number of detail records ( i.e. 20 etc. as I have oracle 7.3.4 database).
Another option is user transaction, but I will have to make one database call per insert i.e. one for header and one each for detail line. I really want minimum number of database calls as our application server is 700 miles away from database server.
Third suggestion is entity bean, I don�t know much about it but ready to explore.
P lease suggest me best possible solution.
Thanks
Pramod

Hi,
I working on j2ee project. I have a requirement like
this.
I need to insert a data into one master and one detail
table. There will one header record and multiple
detail records. I should insert successfully in both
the table. If any insert fails I should rollback both
the inserts. How can I achieve it. Should I use user
transaction or entity bean or stored procedure. IF it
is a stored procedure, I can have only one database
call and can manage rollback and commit in procedure
itself but the drawback is I can not insert variable
number of detail records, I will have to use limited
number of detail records ( i.e. 20 etc. as I have
oracle 7.3.4 database).
Another option is user transaction, but I will have to
make one database call per insert i.e. one for header
and one each for detail line. I really want minimum
number of database calls as our application server is
700 miles away from database server.
Third suggestion is entity bean, I don�t know much
about it but ready to explore.
P lease suggest me best possible solution.
Thanks
PramodI don't know if this is the best possible, but it's the best I know:
- use stateless session beans as far as possible (assuming high user load)
- transactions are managed outside the ejb code and how you do it in the DD is container specific
- in general, avoid entity beans unless you really need them, if you use them use CMP for your container
- don't use BMP unless you are sure you know exactly what you are doing
Not a bible just some ideas,
/k1

Can XSQL create multiple session variables using only one database call?

Right now if I want to set session variables for username and accesslevel, I code out like this:
<xsql:set-session-param name="name" bind-params="username password">
SELECT DISTINCT USERNAME
FROM LKUP_USER
WHERE USERNAME = ? AND PASSWORD = ? AND ACCESSLEVEL = 0
</xsql:set-session-param>
<xsql:set-session-param name="authlvl" bind-params="username password">
SELECT DISTINCT ACCESSLEVEL
FROM LKUP_USER
WHERE USERNAME = ? AND PASSWORD = ? AND ACCESSLEVEL = 0
</xsql:set-session-param>Is there any way to do it so that I don't have to do multiple queries to the database to set session variables? i.e., something like this:
<xsql:set-multiple-session-param name="user authlvl" bind-params="username password">
SELECT DISTINCT USERNAME,
ACCESSLEVEL
FROM LKUP_USER
WHERE USERNAME = ? AND PASSWORD = ? AND ACCESSLEVEL = 0
</xsql:set-multiple-session-param>Sort of like how bind-params works. Setting bind-params="username password" makes the first ? akin to username and the next ? akin to password.
Is this functionality already in existence?
Thanks!
Malik Graves-Pryor

Not currently possible to collapse into one request without doing it in a custom action handler.
A custom action handler can:
[list=1]
[*]Get the current JDBC connection from the XSQLPageRequest
[*]Get the SQL statement to perform using the function getActionElementContent
[*]Handle any bind parameters specified an a bind-params attribute on the action element by calling handleBindVariables()
[*]Execute and fetch the row from the query
[*]Check to see that the return value of getPageRequest().getRequestType() equals the value "Servlet"
[*]Cast the page request to an XSQLServletPageRequest and call getHttpServletRequest()
[*]Call getSession() on the request
[*]Set the session variables you want to
[*]Close the JDBC statement
[list]
will consider a built-in enhancement for a future XSQL release.

Broadcasting to Enterprise Portal using Bex Broadcaster from Query Designer

I have already been able to broadcast from Query Designer using BEx Broadcaster to the portal based on a role or a user.
I select "Export into Enterprise Portal" as the Distribution Type.
I then select "Export Document to Personal Portfolio" and then enter a role.
Then I check "User-specific" because I want it to be user specific.
This all works fine.
Now I get to my question.
Can I go one step further and broadcast to a folder call... lets say "Sales" inside of their Personal Portfolio?

Hi Eric,
I have the same problem. Were you able to resolve it?

Database call fired twice when using actionListener in dataTable

Hi all,
I have a question regarding the request bean lifecylce in the current use case (using Sun JSF 1.2)
I have a managed bean in request scope that contains an ArrayList which is used as the data provider in a dataTable on a faces page.
The bean contains an init() method to populate the ArrayList using a database call.
The dataTable also contains a column with a commandLink that calls a method via actionListener inside the managed bean to delete the current row.
When I click the link the action gets called and deletes the row from the database. I also reload the data from the database and assign it to my ArrayList.
However, the init Method is also called before the action is executed. So the database call is fired twice when hitting the link:
- First time in the init() method of the bean
- Second time in the actionListener method when reloading the data
I can not remove the call from the actionListener, because the data has not deleted yet.
Question:*
How can I make sure the database call is fired once only? (and also making sure the ArrayList is populated appropriate)
Maybe I am doing something wrong here? Thanks in advance for any help.
Maik
This is the request scope bean:
public class UserBean implements Serializable {
    private List all;
    private Long userId = null;
    @PostConstruct
    public void init() {
        if(all == null) {
            new ArrayList();
            loadUserList();
     * Constructor
    public UserBean() {
        super();
     * @return the userId
    public Long getUserId() {
        return userId;
     * @param userId
     *            the userId to set
    public void setUserId(Long userId) {
        this.userId = userId;
     * @param all
     *            the all to set
    public void setAll(List all) {
        this.all = all;
    public List getAll() throws GeneralModelException {
        return all;
    public void loadUserList() {
        EntityManager em = Contexts.getEntityManager();
        Query q = em.createNamedQuery("user.findAll");
        all = q.getResultList();
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        EntityManager em = Contexts.getEntityManager();
        Query q = em.createNamedQuery("user.byId");
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No, I do not call the init() method.
Basically the init() is called before the deleteAction() so the ArrayList still contains the old value, unless a second database call is triggered after the entity has been deleted.
Maybe I am missing something here...
See also here (JSF 1.2 RI - Bean Instantiation and Annotation)
[http://weblogs.java.net/blog/jhook/archive/2007/05/jsf_12_ri_backi.html]
Here is the init() call stack trace
Daemon Thread [http-8080-2] (Suspended (breakpoint at line 32 in UserBean))
     UserBean.init() line: 32
     NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]
     NativeMethodAccessorImpl.invoke(Object, Object[]) line: not available
     DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: not available
     Method.invoke(Object, Object...) line: not available
     DefaultAnnotationProcessor.postConstruct(Object) line: 79
     Tomcat6InjectionProvider.invokePostConstruct(Object) line: 118
     ManagedBeanBuilder(BeanBuilder).invokePostConstruct(Object, InjectionProvider) line: 223
     ManagedBeanBuilder(BeanBuilder).build(InjectionProvider, FacesContext) line: 108
     BeanManager.createAndPush(String, BeanBuilder, ELUtils$Scope, FacesContext) line: 368
     BeanManager.create(String, FacesContext) line: 230
     ManagedBeanELResolver.getValue(ELContext, Object, Object) line: 88
     FacesCompositeELResolver(CompositeELResolver).getValue(ELContext, Object, Object) line: 53
     FacesCompositeELResolver.getValue(ELContext, Object, Object) line: 72
     AstIdentifier.getValue(EvaluationContext) line: 61
     AstValue.getTarget(EvaluationContext) line: 59
     AstValue.setValue(EvaluationContext, Object) line: 129
     ValueExpressionImpl.setValue(ELContext, Object) line: 249
     JspValueExpression.setValue(ELContext, Object) line: 85
     RestoreViewPhase.doPerComponentActions(FacesContext, UIComponent) line: 240
     RestoreViewPhase.doPerComponentActions(FacesContext, UIComponent) line: 245
     RestoreViewPhase.doPerComponentActions(FacesContext, UIComponent) line: 245
     RestoreViewPhase.execute(FacesContext) line: 195
     RestoreViewPhase(Phase).doPhase(FacesContext, Lifecycle, ListIterator<PhaseListener>) line: 100
     RestoreViewPhase.doPhase(FacesContext, Lifecycle, ListIterator<PhaseListener>) line: 104
     LifecycleImpl.execute(FacesContext) line: 118
     FacesServlet.service(ServletRequest, ServletResponse) line: 265

How can i access dmz server via public ip from inside?

hi all !
As shown in Figure，how can i access the server in dmz zone via public？
i can access it via private ip 192.168.1.1 now,but i can't access it via 101.100.1.2.
who can help me ?
thank you !

Hi,
You would have to configure Static NAT from DMZ to INSIDE for the server in the same way you have done for DMZ to OUTSIDE.
Basically in the following way for example
object network DMZ-WEB
host 192.168.1.1
nat (dmz,inside) static 101.100.1.2
This would enable your users on the "inside" to access the "dmz" server with the public IP address. And naturally only with the public IP address after this NAT.
Hope this helps
Please do remember to mark a reply as the correct answer if it answered your question.
Feel free to ask more if needed
- Jouni

Is it possible to call custom designed RFC function module, apart from BAPI

Hi Friends,
1. Is it possible to call custom designed RFC function module, apart from BAPI.
2. Why we call it Adaptive RFC layer, Since every time the JCO layer updated with SAP, Why cant be dynamic.
Thanx for Ur time.
Cheers,
Sam

Also check <a href="http://help.sap.com/saphelp_nw04/helpdata/en/41/38bc8f813719488ddc9d9b21251ec3/frameset.htm">here</a> for more information on aRFC. Here you can find why it is called adaptive.
Regards,
Christophe

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