InvocationTargetException in User Defined Function in Oracle CEP

I was trying to use a UDF in my CQL query. But I got the following error:
An InvocationTargetException was encountered while attempting to register the user defined function
"mymod". The message was: null
My code snippet is bellow:
Bean:
package com.bea.wlevs.example.function;
import com.bea.wlevs.oracle.ci.event.CiMessages;
public class UpdateMessage {
    public CiMessages addChannel(CiMessages cm, String channel){
        System.out.println("I am in function");
        cm.setChannel(channel);
        return cm;
config.xml:
<processor>
<name>CiRuleEngine</name>
<rules>
<query id="filterRule"> <![CDATA[ select addChannel(*,"SMSData") from DCInputChannel[now] as dc ]]> </query>
</rules>
    </processor>
content.xml:
<wlevs:processor id="CiRuleEngine">
<wlevs:listener ref="IntermediateChannel" />
<wlevs:function function-name="mymod" exec-method="addCHannel">
<bean class="com.bea.wlevs.example.function.UpdateMessage"/>
</wlevs:function>
    </wlevs:processor>
Can any one help me to resolve this error?

The asterisk * in invocation addChannel(*,"SMSData") does not mean the event object. This is the cause of the exception.
For your case, it's much easier to implement a userbean to do the insertion of the channel.
Thanks
Junger

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Calling user defined function in Oracle BI Answers?

Hi
I am new in Oracle BI . I want to use the user defined function in Oracle BI Answers as a column,function written in Oracle database to calculate the Sales Revenue.
I am using Oracle BI Standard Edition One and Oracle 10g database.
Please suggest me.
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Search for EVALUATE function you can call function and pass parameters
Example:
EVALUATE Function
This function is intended for scalar and analytic
calculations.
Syntax: EVALUATE('DB_Function(%1)', {
Comma separated Expression})
Example: SELECT
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Converting the iif function in MS Access97 to an user defined function in Oracle

Hi ,
I have a problem here we are working with Visual Basic 6.0(ADOs 2.5) with Oracle 8i release 2. we have some queries stored in the tables which contains the iif function of MS Access 97 do we have a similar built in function in Oracle which replaces this iif function of Ms Access 97.
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Jai:
Hi ,
I have a problem here we are working with Visual Basic 6.0(ADOs 2.5) with
Oracle 8i release 2. we have some queries stored in the tables which contains the iif function of MS Access 97 do we have a similar built in function in Oracle which replaces this iif function of Ms Access 97.we cannot use DECODE (built in function) of oracle b'cos it cannot be used in a where clause and we cannot write a user defined function also because it cannot be generalized for use b'cos sometimes we use field names and
sometimes string values as expression in the iif functions. is there any other built in function ? can anybody suggest me some idea
please mail me at [email protected]
regards
Jai<HR></BLOCKQUOTE>
Hi,
You still can use the seccond approach - with a udf IIF() that you place in a package and OVERLOAD it. See the documentation for limitations of Overloading
Overloading permits you to declare several functions with the same name but havind different behaviours depending on the number and type of the parameters.
George

Converting db2 user defined functions to oracle .

Hi gurus
this is a user defined function for getting current timestamp for a null value how to do this in oracle .i am getting a problem at the input values.can anyone suggest me the changes to convert it into oracle udfs.
drop function Get_DateId()
CREATE FUNCTION Get_DateId()
RETURNS BIGINT
BEGIN ATOMIC
DECLARE      R BIGINT;
DECLARE      v_Day CHAR(2);
DECLARE      v_Month CHAR(2);
DECLARE      v_Year CHAR(4);
     SET V_Day     = SUBSTR( DIGITS (DAY(CURRENT DATE)),9);
     SET V_Month     = SUBSTR( DIGITS (MONTH(CURRENT DATE)),9);
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RETURN R ;
END
@

You'll need to get the syntax for PL/SQL function calls right. You will need something like
create or replace function whatever( arg datatype, arg datatype...) return varchar2 is
--define any local variables here
begin
   return to_number(to_char(systimestamp,'the edit mask you want to use'));
end;
/You might do the conversion inline and dispense with the function compeletly if you're just generating a value.

How can I find user defined functions in oracle

Hello All,
I need to find out what are the user defined functions available in my schema?
Please let me know on what system tables shall I query and find out the user defined functions?
Thanks,
Milind.

Thanks Satish,
One more query. Can I find what are the parameters that needs to be passed?
Here is what I have to do..
I have to find all the accessible user defined functions. If I select one of them in my UI, I need to show the parameters used in the respective function.
Please let me know if these parameters are stored anywhere..
Thanks again,
Milind

How to distinguish the User-Defined-Function from Oracle Build-In function

Hi Friends,
I could get the function list form all_objects table by the SQL:
select * from all_objects where object_type = 'FUNCTION'
but there is no column in all_objects specify the function is build-in or user-defined.
But I found in SQL Server there is a column "is_ms_shipped" in the sys.all_objects table. This column will specify the object is build-in or user-defined. I want to get the equivalent column in Oracle but failed.
Could anyone tell me how to solve this problem?
Thanks,
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Thanks Pavan.
But if an user connects to database using "conn /as sysdba" syntax and creates a function. This user-defined funtion goes into the "SYS" schema also. I know it is not the best practise to create objects using sys user so I think your solution is right.
Regards,
Ricky

Error while using user defined function in reports

Hi,
When I use the below user defined function in oracle reports I got the wrong number of arguments error
select test_function(id,a_number,v_date-14,b_number) from dual;
If I remove -14 from the argument it works. But iIneed to subtract 14 days from the date.
Thanks for your help.

select test_function(id,a_number,v_date-14,b_number) from dual;
you have to give the command like this to_date(v_date,'dd-mon-yyyy')-14
because the v_Date you choose in the parameter form is not having the corrent date format
the format dd-mon-yyyy is the format in which v_date is passed by the user.

Calling ORACLE Store Procedure with parameters in user define function

Hi everybody,
We have a scenario connecting Oracle DB thru JDBC adapter.
We have to call store procedure with input parameter and output parameter to retrieve data from DB. The implementation was made using JDBC adapter by building the correct XML message with EXECUTE action, and it works fine.
Now we need to use DB lookup within mapping. I wrote users define function with SELECT statement (using the JDBC adapter) and it works fine but I need to call store procedure in ORACLE instead of SELECT statement.
I found lot of examples concerning DB lookup but none of them explained how to write UDF calling store procedure in ORACLE with input and output parameters.
I am looking for an example.
Thanks in advance,
Gigi

I agree with you, but issue is we have lots of existing store procedure, which we need to call where damn required. I am sure those will be few but still i need to find out.
If you think you are going to get existing MS Stored Procedures or Oracle Packages that had nothing to do with the ORM previously to work that are not geared to do simple CRUD operations with the ORM and the database tables, you have a rude awakening
coming that's for sure. You had better look into using ADO.NET and Oracle Command objects and call those Oracle Packages by those means and use a datareader.
You could use the EF backdoor, call Oracle Command object and use the Packages, if that's even possible, just like you can use MS SQL Server Stored Procedures or in-line T-SQL via the EF backdoor.
That's about your best shot.
http://blogs.msdn.com/b/alexj/archive/2009/11/07/tip-41-how-to-execute-t-sql-directly-against-the-database.aspx

10g - cache, report contains oracle user defined function

hi, experts,
from http://obiee101.blogspot.com/2008/07/obiee-cache-management.html
Reasons Why a Query is Not Added to the Cache:
•Non-cacheable SQL element. If a SQL request contains Current_Timestamp, Current_Time, Rand, Populate, or a parameter marker then it is not added to the cache.
•Non-cacheable table. Physical tables in the Oracle BI Server repository can be marked 'noncacheable'. If a query references any non-cacheable table then the query results will not be added to the cache.
•Cache hit. In general, if the query gets a cache hit on a previously cached query, then the results of the current query are not added to the cache. The exception is query hits that are aggregate roll-up hits.
•Result set is too big.
Query is cancelled. This can happen by explicit cancellation from Oracle BI Presentation Services or the Administration Tool, or implicitly through timeout.
•Oracle BI Server is clustered. Queries that fall into the ‘cache seeding’ family are propagated throughout the cluster. Other queries continue to be stored locally. Therefore, even though a query may be put into the cache on Oracle BI Server node 1, it may not be on Oracle BI Server node 2.
I would like to know
if the request (report on dashboard) calls an oracle user defined function, can the cache be created and saved for this report?
thank you very much!

Hi stephen,
if the request (report on dashboard) calls an oracle user defined function, can the cache be created and saved for this report?Yes,it is cached.....function defined in database is called in OBIEE is cached and saved.
More information and example can be found here http://oraclebizint.wordpress.com/2007/09/10/oracle-bi-ee-10133-support-for-native-database-functions-and-aggregates/
Hope it helps you.Check all other questions you posted are answered?
By,
KK

Accessing a Cache From an Oracle CQL User-Defined Function

According to the docs ...
I am to use the following element to set the cache property in my bean...
<wlevs:property name="cache" ref="cache-id"/>
However, when I set it, the assembly does not validate.
If I use <property>, I get a NullPointerException on each request when my processor runs.
Using the same CQL code..
Without the <property> tag, the call to the user-defined function works (but I don't have the cache attribute set obviously).
Here is the excerpt from my assembly...
<bean id="cacheFunction" class="ou.cep.function.CacheFunction">
<property name="cache" ref="myCache"/>
</bean>

<wlevs:processor id="myProcessor">
<wlevs:listener ref="CacheChannel"/>
<wlevs:function ref="cacheFunction" function-name="isValidID" exec-method="isValidID">
</wlevs:function>
</wlevs:processor>
To repeat, with the same CQL with the user-defined function call, if I remove the property element from the bean definition, I can call the function successfully (it just doesn't do what I need it to do). In this case, I am still using the ref=cacheFunction for the wlevs:function within the processor.
What am I doing wrong?
Edited by: fl0at on Oct 5, 2010 12:22 PM
Edited by: fl0at on Oct 5, 2010 12:28 PM

The case is solved, not sure I could explain why, but...
This implementation of the user-defined function was a migration from an implementation using the same cache in the join. So, when I removed the cache reference in the source stream (where I am now executing a function that accesses the cache), the problem went away and everything is working.
I can explain further if there are questions.
If anyone has thoughts on this, please advise.
As always, thanks for the help.

Writing user defined function the same way as the oracle functions

Hi Guys,
In one of the interviews , I have attended the guy asked me to write a user defined function which will take the column name and list all the values .
For example
Table Name:Employees
Column Name: Employee_Name
Employee_name
Scott
Ivgun
Jack
Shane
The query should be in this fromat
SELECT col_agg(Employee_name) emp_name from Employees;
The output shoulld be
Emp_names
scott,ivgun,jack,shane
Please let me know if this is possible
Any suggestions will be highly appreciated.
Thanks,
Ranjan

You could certainly write a user defined aggregate function if you like...
e.g. this function will aggregate strings into a CLOB...
create or replace type clobagg_type as object
text clob,
static function ODCIAggregateInitialize(sctx in out clobagg_type) return number,
member function ODCIAggregateIterate(self in out clobagg_type, value in clob) return number,
member function ODCIAggregateTerminate(self in clobagg_type, returnvalue out clob, flags in number) return number,
member function ODCIAggregateMerge(self in out clobagg_type, ctx2 in clobagg_type) return number
create or replace type body clobagg_type is
static function ODCIAggregateInitialize(sctx in out clobagg_type) return number is
begin
    sctx := clobagg_type(null) ;
    return ODCIConst.Success ;
end;
member function ODCIAggregateIterate(self in out clobagg_type, value in clob) return number is
begin
    self.text := self.text || value ;
    return ODCIConst.Success;
end;
member function ODCIAggregateTerminate(self in clobagg_type, returnvalue out clob, flags in number) return number is
begin
    returnValue := self.text;
    return ODCIConst.Success;
end;
member function ODCIAggregateMerge(self in out clobagg_type, ctx2 in clobagg_type) return number is
begin
    self.text := self.text || ctx2.text;
    return ODCIConst.Success;
end;
end;
create or replace function clobagg(input clob) return clob
deterministic
parallel_enable
aggregate using clobagg_type;
SQL> select trim(',' from clobagg(ename||',')) as enames from emp;
ENAMES
SMITH,ALLEN,WARD,JONES,MARTIN,BLAKE,CLARK,SCOTT,KING,TURNER,ADAMS,JAMES,FORD,MILLER
SQL> ed
Wrote file afiedt.buf
1 with t as
2    (select 'PFL' c1, 0 c2,110 c3 from dual union all
3     select 'LHL', 0 ,111 from dual union all
4     select 'PHL', 1, 111 from dual union all
5     select 'CHL', 2, 111 from dual union all
6     select 'DHL', 0, 112 from dual union all
7     select 'VHL', 1, 112 from dual union all
8     select 'CPHL', 0, 114 from dual union all
9     select 'WDCL', 1, 114 from dual union all
10     select 'AHL' ,2 ,114 from dual union all
11     select 'NFDL', 3, 114 from dual)
12 --
13 -- end of test data
14 --
15 select trim(clobagg(c1||' ')) as c1, c3
16 from (select * from t order by c3, c2)
17 group by c3
18* order by c3
SQL> /
C1                                     C3
PFL                                   110
LHL CHL PHL                           111
DHL VHL                               112
CPHL AHL NFDL WDCL                    114Ok, it's more than just a function as it uses an object type linking into the internals of the ODCI... but it does what you ask. :)

How to resolve the error while using user defined function.

EPN Assembly file
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:osgi="http://www.springframework.org/schema/osgi"
xmlns:wlevs="http://www.bea.com/ns/wlevs/spring"
xmlns:jdbc="http://www.oracle.com/ns/ocep/jdbc"
xmlns:spatial="http://www.oracle.com/ns/ocep/spatial"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/osgi
http://www.springframework.org/schema/osgi/spring-osgi.xsd
http://www.bea.com/ns/wlevs/spring
http://www.bea.com/ns/wlevs/spring/spring-wlevs-v11_1_1_3.xsd
http://www.oracle.com/ns/ocep/jdbc
http://www.oracle.com/ns/ocep/jdbc/ocep-jdbc.xsd
http://www.oracle.com/ns/ocep/spatial
http://www.oracle.com/ns/ocep/spatial/ocep-spatial.xsd">
     <wlevs:event-type-repository>
          <wlevs:event-type type-name="TestEvent">
               <wlevs:class>com.bea.wlevs.event.example.FunctionCEP.TestEvent</wlevs:class>
          </wlevs:event-type>
     </wlevs:event-type-repository>
     <wlevs:adapter id="InputAdapter"
          class="com.bea.wlevs.adapter.example.FunctionCEP.InputAdapter">
          <wlevs:listener ref="inputStream" />
     </wlevs:adapter>
     <wlevs:channel id="inputStream" event-type="TestEvent">
          <wlevs:listener ref="processor" />
     </wlevs:channel>
     <wlevs:processor id="processor">
          <wlevs:listener ref="outputStream" />
          <wlevs:function function-name="sum_fxn" exec-method="execute">
          <bean>com.bea.wlevs.example.FunctionCEP.TestFunction</bean>
          </wlevs:function>
     </wlevs:processor>
     <wlevs:channel id="outputStream" event-type="TestEvent">
          <wlevs:listener ref="bean" />
     </wlevs:channel>
     <bean id="bean" class="com.bea.wlevs.example.FunctionCEP.OutputBean">
     </bean>
</beans>
Event class
package com.bea.wlevs.event.example.FunctionCEP;
public class TestEvent {
     private int num_1;
     private int num_2;
     private int sum_num;
     public int getSum_num() {
          return sum_num;
     public void setSum_num(int sumNum) {
          sum_num = sumNum;
     public int getNum_1() {
          return num_1;
     public void setNum_1(int num_1) {
          this.num_1 = num_1;
     public int getNum_2() {
          return num_2;
     public void setNum_2(int num_2) {
          this.num_2 = num_2;
Adapter class
package com.bea.wlevs.adapter.example.FunctionCEP;
import com.bea.wlevs.ede.api.RunnableBean;
import com.bea.wlevs.ede.api.StreamSender;
import com.bea.wlevs.ede.api.StreamSource;
import com.bea.wlevs.event.example.FunctionCEP.TestEvent;
public class InputAdapter implements RunnableBean, StreamSource {
private StreamSender eventSender;
public InputAdapter() {
super();
public void run() {
     generateMessage();
private void generateMessage() {
     TestEvent event = new TestEvent();
     event.setNum_1(10);
     event.setNum_2(20);
     eventSender.sendInsertEvent(event);
public void setEventSender(StreamSender sender) {
eventSender = sender;
public synchronized void suspend() {
Output Bean class
package com.bea.wlevs.example.FunctionCEP;
import com.bea.wlevs.ede.api.StreamSink;
import com.bea.wlevs.event.example.FunctionCEP.TestEvent;
import com.bea.wlevs.util.Service;
public class OutputBean implements StreamSink {
     public void onInsertEvent(Object event) {
          System.out.println("In Output Bean");
          TestEvent event1 = new TestEvent();
          System.out.println("Num_1 is :: " + event1.getNum_1());
          System.out.println("Num_2 is :: " +event1.getNum_2());
          System.out.println("Sum of the numbers is :: " +event1.getSum_num());
Function Class
package com.bea.wlevs.example.FunctionCEP;
public class TestFunction {
     public Object execute(int num_1, int num_2)
          return (num_1 + num_2);
config.xml file
<?xml version="1.0" encoding="UTF-8"?>
<wlevs:config xmlns:wlevs="http://www.bea.com/ns/wlevs/config/application"
xmlns:jdbc="http://www.oracle.com/ns/ocep/config/jdbc">
     <processor>
          <name>processor</name>
               <rules>
               <view id="v1" schema="num_1 num_2">
                    <![CDATA[
                         select num_1, num_2 from inputStream
                    ]]>
               </view>
               <view id="v2" schema="num_1 num_2">
               <![CDATA[
               select sum_fxn(num_1,num_2), num_2 from inputStream // I am getting error when i am trying to call this function
               ]]>
               </view>
               <query id="q1">
                    <![CDATA[
                         select from v2[now] as num_2*     // Showing error while accessing the view also               ]]>
               </query>
          </rules>
     </processor>
</wlevs:config>
Error I am getting is :
Invalid statement: "select >>sum_fxn<<(num_1,num_2),age from inputStream"
Description: Invalid call to function or constructor: sum_fxn
Cause: Probable causes are: Function name sum_fxn(int,int) provided is invalid, or arguments are of
the wrong type., or Error while handling member access to complex type. Constructor sum_fxn of type
sum_fxn not found. or Probable causes are: Function name sum_fxn(int,int) provided is invalid, or
arguments are of the wrong type., or Error while handling member access to complex type.
Constructor sum_fxn of type sum_fxn not found.
Action: Verify function or constructor for complex type exists, is not ambiguous, and has the correct
number of parameters.
I have made a user defined function in a java class and configured this function in the EPN assembly file under the processor tag.
But when i am trying to access the function in the config.xml file , it is giving me an error in the query.
Please provide urgent help that how to write the exact query.

Hi,
In the EPN Assembly file use
<bean class="com.bea.wlevs.example.FunctionCEP.TestFunction"/>
instead of
<bean>com.bea.wlevs.example.FunctionCEP.TestFunction</bean>
Best Regards,
Sandeep

Getting error while using user-defined function in transform activity

Hi
I designed one user-defined function to add 2 nos following the
link:http://docs.oracle.com/cd/E16764_01/integration.1111/e10224/bp_xslt_mpr.htm .
Under this i followed the portion creating user-defined function.
After deploying,i'm getting an error stating:"<summary>
An error occurs while processing the XPath expression; the expression is ora:doXSLTransformForDoc("xsl/Transformation_1.xsl", $inputVariable.payload).
</summary>
<detail>
XPath expression failed to execute.
An error occurs while processing the XPath expression; the expression is ora:doXSLTransformForDoc("xsl/Transformation_1.xsl", $inputVariable.payload).
The XPath expression failed to execute; the reason was: javax.xml.transform.TransformerException: oramds:/deployed-composites/PO/HelloWorld_rev1.0/xsl/Transformation_1.xsl<Line 6, Column 104>: XML-22045: (Error) Extension function error: Class not found '
Missing class: addition.add
can anybody help me in this regard
Thanks
Avinash

Did you copy the jar file of your java classes to MIDDLEWARE_Home/user_projects/domains/soa_domain/lib?
http://georgie-soablog.blogspot.com/2010/06/soasuite-11g-implement-user-defined.html
hope this helps

User Defined Function Error - Can't find function

Hi All,
Version: 11.1.1.4
I created a user defined function and added it to one of my BPEL Processes. I can see the function in JDeveloper and can compile the project without issue. We placed the jar file out on the SOA Server following the oracle user defined function examples. After placing the file out on weblogic I was able to successfully deploy the project.
Oracle Deployment Steps:
To deploy user-defined functions to runtime:
1. Copy the user-defined function JAR files to BEA_Home/user_projects/domains/domain_name/lib or a subdirectory of lib. Where domain_name is the name of the Oracle WebLogic Server domain (for example, soainfra).
2. Restart the Oracle WebLogic Server.However, when I try to run the composite application I get the below error. I am not really sure why it can't find the Function? The jar is out on the server and the jar was added to the project?
Error:
Non Recoverable System Fault :
<bpelFault><faultType>0</faultType><subLanguageExecutionFault xmlns="http://schemas.oracle.com/bpel/extension"><part name="summary"><summary>XPath expression failed to execute. An error occurs while processing the XPath expression; the expression is pnl:GetManager(string(bpws:getVariableData('inputVariable','payload','/client:process/client:input'))). The XPath expression failed to execute; the reason was: Function 'GetManager' not found.. Check the detailed root cause described in the exception message text and verify that the XPath query is correct. </summary></part><part name="code"><code>XPathExecutionError</code></part></subLanguageExecutionFault></bpelFault>Any suggestions would be greatly appreciated!
Thanks,
S
Edited by: Scarpacci on Apr 1, 2011 6:06 AM

try putting the jar location explicitly in weblogic server's classpath i.e. add BEA_Home/user_projects/domains/domain_name/lib to wls classpath and restart server.

Using User Defined Function is SQL

Hi
I did the following test to see how expensive it is to use user defined functions in SQL queries, and found that it is really expensive.
Calling SQRT in SQL costs less than calling a dummy function that just returns
the parameter value; this has to do with context switchings, but how can we have
a decent performance compared to Oracle provided functions?
Any comments are welcome, specially regarding the performance of UDF in sql
and for solutions.
create or replace function f(i in number) return number is
begin
return i;
end;
declare
l_start   number;
l_elapsed number;
n number;
begin
select to_char(sysdate, 'sssssss')
    into l_start
    from dual;
for i in 1 .. 20 loop
    select max(rownum)
      into n
      from t_tdz12_a0090;
end loop;
select to_char(sysdate, 'sssssss') - l_start
    into l_elapsed
    from dual;
dbms_output.put_line('first: '||l_elapsed);
select to_char(sysdate, 'sssssss')
    into l_start
    from dual;
for i in 1 .. 20 loop
    select max(sqrt(rownum))
      into n
      from t_tdz12_a0090;
end loop;
select to_char(sysdate, 'sssssss') - l_start
    into l_elapsed
    from dual;
dbms_output.put_line('second: '||l_elapsed);
select to_char(sysdate, 'sssssss')
    into l_start
    from dual;
for i in 1 .. 20 loop
    select max(f(rownum))
      into n
      from t_tdz12_a0090;
end loop;
select to_char(sysdate, 'sssssss') - l_start
    into l_elapsed
    from dual;
dbms_output.put_line('third: '||l_elapsed);
end;
Results:
   first: 303
   second: 1051
   third: 1515
Kind regards
Taoufik

I find that inline SQL is bad for performance but
good to simplify SQL. I keep thinking that it should
be possible somehow to use a function to improve
performance but have never seen that happen.inline SQL is only bad for performance if the database design (table structure, indexes etc.) is poor or the way the SQL is written is poor.
Context switching between SQL and PL/SQL for a User defined function is definitely a way to slow down performance.
Obviously built-in Oracle functions are going to be quicker than User-defined functions because they are written into the SQL and PL/SQL engines and are optimized for the internals of those engines.
There are a few things you can do to improve function
performance, shaving microseconds off execution time.
Consider using the NOCOPY hints for your parameters
to use pointers instead of copying values. NOCOPY
is a hint rather than a directive so it may or may
not work. Optimize any SQL in the called function.
Don't do anything in loops that does not have to be
done inside a loop.Well, yes, but it's even better to keep all processing in SQL where possible and only resort to PL/SQL when absolutely necessary.
The on-line documentation has suggested that using a
DETERMINISTIC function can improve performance but I
have not been able to demonstrate this and there are
notes in Metalink suggesting that this does not
happen. My experience is that DETERMINISTIC
functions always get executed. There's supposed to
be a feature in 11g that acually caches function
return values.Deterministic functions will work well if used in conjunction with a function based index. That can improve access times when querying data on the function results.
You can use DBMS_PROFILER to get run-time statistics
for each line of your function as it is executed to
help tune it.Or code it as SQL. ;)

InvocationTargetException in User Defined Function in Oracle CEP

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