SQL query from C++ application using ODBC 10.2.0.4 is very slow

Hi,
We are using ODBC oracle driver to access 10g Oracle server from C++ apllication. But the performace is very slow.
Recently we tried with Microsoft Oracle ODBC driver, which we found faster than 10.2.0.4 Oracle ODBC driver.
Please let me know is anything is ther any issue with this driver or is it better to use Microsoft ODBC driver.
Thanks,
Sabbi

Hi StephenEP,
As the issue is more related to C++ programming, I would like to recommend you post the question in the Visual C++ forum at
https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?forum=vcgeneral . It is appropriate and more experts will assist you.
Thanks,
Lydia Zhang

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Retrieve SQL Query from report without RAS.

We have a fat client application which uses Crystal Reports. We upgraded from the RDC/ActiveX viewer to the .Net SDK/.Net Viewer. One feature that we miss is that we used to read the SQL Query that a report used and wrote it to our log file. This helped with debugging and with troubleshooting problems in the field.
Since we only deploy the freely distributable Crystal Reports model and I don't think that RAS falls into this category is there a way which we can read the SQL Query from a report? If not, could you add this to a list of requested features for future versions.
I understand why you removed the ability to set the SQL query, but simply reading it does add value. Maybe it is difficult for you to return this before the report is run in which case giving us the ability to read the value after the report has been run would also be fine.
Alternatively some sort of event that is fired each time a query is executed would also be helpful as this would allow Crystal Reports clients to monitor SQL from sub-reports. You could even build a robust logging mechanism which could report additional information (i.e. number of rows returned, formula evaluations, or anything related to report execution). All of this would make troubleshooting report issues easier for those of us who use Crystal Reports.

Need to know what version of CR you are using?
You can use InProc RAS, it comes with CR and is distributed with the runtime files.
If you are using CR Basic or the version that comes with Visual Studio .NET then no this will not be added to that product line. It is basic functionality only. You will need to upgrade to a Developer version of Crystal reports to take advantage of the the RCAPI features as well as more general API's.
There is logging for our DB drivers but the log files get very large. If you use ODBC then you have the option to turn on tracing also. Using RAS you don't need to turn on logging as you can get the SQL. This won't be added either.
Thank you
Don

See sql query from crystal report without crystal report

see sql query from crystal report without crystal report

Hi,
Depends on datasource type but you could have a look at ODBC trace or if you have access to the SQL Server you could use profiler to monitor the session.
Regards,
Craig
And this will only be of use if you know which Server/Insstance/Database the Report is connecting to...
Please click "Mark As Answer" if my post helped. Tony C.

[SOLVED]overriding VO's SQL query in an application module

Hi, can anybody help me in searching examples of everriding some aspects of VO in an application module.
As i learned we can override, for example the "WHERE" clause of an VO's SQL query in different application modules, using as i supply the addWhereClause method on SomeViewObjImpl object.
... but are there any examples of using this possibility? Should i create a custom method in application module java class?
Thanks in advance. Best Regards.Alex.
Message was edited by:
Timin
Message was edited by:
Timin

Hi, can anybody help me in searching examples of everriding some aspects of VO in an application module.
As i learned we can override, for example the "WHERE" clause of an VO's SQL query in different application modules, using as i supply the addWhereClause method on SomeViewObjImpl object.
... but are there any examples of using this possibility? Should i create a custom method in application module java class?
Thanks in advance. Best Regards.Alex.
Message was edited by:
Timin
Message was edited by:
Timin

Hide an error from the application using a servererror trigger?

We have an application designed for an old oracle version which issues some sql which is no more supported in todays database version.
We want to use the application unchanged with a new database server.
Old Server Version: 7.3.4 (still in production...)
New Server Version: 10.2 or 11.2
The application issues an
ALTER SESSION SET OPTIMIZER_GOAL = FIRST_ROWS ;
which results in ORA-01986 and the application dies.
We would like to hide the error 01986 from the application using a trigger:
create or replace
trigger catch01986
after servererror
on schema
begin
    if (ora_is_servererror (1986)) then
      null; -- what to do here? we want clear the ora-01986 from the error stack
    end if;
end catch01986;How to handle the error, so that the alter session set ... statement is just ignored and no error code is returned to the application?
I asked already some days ago in Database-General Forum, but triggers belong to PL/SQL, so i repost here.
Tnx for help in advance!

Hi,
hoek wrote:
A totally weird and untested (and unable to test today) thought:
http://technology.amis.nl/blog/447/how-to-drive-your-colleagues-nuts-dbms_advanced_rewrite-oracle-10g
Very interesting for real dirty solution.
Does not work for my problem, DBMS_ADVANCED_REWRITE works only for select statements.
BEGIN
   SYS.DBMS_ADVANCED_REWRITE.DECLARE_REWRITE_EQUIVALENCE (
   'alter_session_equivalence',
   'ALTER SESSION SET OPTIMIZER_GOAL = FIRST_ROWS',
   'ALTER SESSION SET OPTIMIZER_MODE = RULE',
   FALSE);
END;
ORA-30389: the source statement is not compatible with the destination statement
ORA-00903: invalid table name
ORA-06512: at "SYS.DBMS_ADVANCED_REWRITE", line 29
ORA-06512: at "SYS.DBMS_ADVANCED_REWRITE", line 185
ORA-06512: at line 2
30389. 00000 - "the source statement is not compatible with the destination statement"
*Cause:    The SELECT clause of the source statement is not compatible with
           the SELECT clause of the destination statement
*Action:   Verify both SELECT clauses are compatible with each other such as
           numbers of SELECT list items are the same and the datatype for
           each SELECT list item is compatible
hoek wrote:You already had some trigger code, catching the error and sending it to null, why didn't that work?The trigger is fired when the error occurs, but after completion of the trigger, the error code is still delivered to the client.
I dont know how to handle the error within the trigger.
Does the client read the error stack and does it die after reading an error from the stack?The client just checks the error code. On error it terminates.
With the SERVERERROR TRIGGER i did the following tests:
Test 1: trigger does nothing
CREATE OR REPLACE
TRIGGER CATCH01986
AFTER SERVERERROR
ON SCHEMA
BEGIN
    IF (ORA_IS_SERVERERROR (1986)) THEN
      NULL;
    END IF;
END CATCH01986;
ALTER SESSION SET OPTIMIZER_GOAL = FIRST_ROWS;
ORA-01986: OPTIMIZER_GOAL is obsolete
01986. 00000 - "OPTIMIZER_GOAL is obsolete"
*Cause:    An obsolete parameter, OPTIMIZER_GOAL, was referenced.
*Action:   Use the OPTIMIZER_MODE parameter.
-- Client Application reports errorcode 1986Test 2: Trigger raises NO_DATA_FOUND
CREATE OR REPLACE
TRIGGER CATCH01986
AFTER SERVERERROR
ON SCHEMA
BEGIN
    IF (ORA_IS_SERVERERROR (1986)) THEN
      RAISE NO_DATA_FOUND;
    END IF;
END CATCH01986;
ALTER SESSION SET OPTIMIZER_GOAL = FIRST_ROWS;
ORA-04088: error during execution of trigger 'AH.CATCH01986'
ORA-01403: no data found
ORA-06512: at line 9
ORA-01986: OPTIMIZER_GOAL is obsolete
04088. 00000 - "error during execution of trigger '%s.%s'"
*Cause:    A runtime error occurred during execution of a trigger.
*Action:   Check the triggers which were involved in the operation.
-- Client Application reports errorcode 4088Test 3: Trigger raising an APPLICATION ERROR
CREATE OR REPLACE
TRIGGER CATCH01986
AFTER SERVERERROR
ON SCHEMA
BEGIN
    IF (ORA_IS_SERVERERROR (1986)) THEN
        DBMS_STANDARD.RAISE_APPLICATION_ERROR(-20999, 'this makes no sense', true);
    END IF;
END CATCH01986;
ALTER SESSION SET OPTIMIZER_GOAL = FIRST_ROWS;
ORA-00604: error occurred at recursive SQL level 1
ORA-20999: this makes no sense
ORA-06512: at line 10
ORA-01986: OPTIMIZER_GOAL is obsolete
00604. 00000 - "error occurred at recursive SQL level %s"
*Cause:    An error occurred while processing a recursive SQL statement
           (a statement applying to internal dictionary tables).
*Action:   If the situation described in the next error on the stack
           can be corrected, do so; otherwise contact Oracle Support.
-- Client Application reports errorcode 604Test 4: Adding an EXCEPTION part to the trigger does not help, this will catch only exceptions raised while the trigger executes:
CREATE OR REPLACE
TRIGGER CATCH01986
AFTER SERVERERROR
ON SCHEMA
BEGIN
    IF (ORA_IS_SERVERERROR (1986)) THEN
        DBMS_STANDARD.RAISE_APPLICATION_ERROR(-20999, 'this makes no sense', true);
    END IF;
EXCEPTION
    WHEN OTHERS THEN
      NULL;
END CATCH01986;
ALTER SESSION SET OPTIMIZER_GOAL = FIRST_ROWS;
ORA-01986: OPTIMIZER_GOAL is obsolete
01986. 00000 - "OPTIMIZER_GOAL is obsolete"
*Cause:    An obsolete parameter, OPTIMIZER_GOAL, was referenced.
*Action:   Use the OPTIMIZER_MODE parameter.
-- Client Application reports errorcode 1986So i do not know what to do inside the trigger to clean the error stack so that the client will receive no errorcode.

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Hi all,
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Hi,
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Best way To get data from another application using NDDE lbrary

My vb.net application gets data from another application using NDDE Library. I got stocks prices (open,high,low,close,volume,change......(about 15 records for each stock)) (about 200 stocks) . I don't know if there is a problem in my code.
This is my code:
l : is the list of stocks.
This Sub connects to server and requests the data :
Public Shared Sub GetQuotes()
Try
client1 = New DdeClient(server, topic)
client1.Connect()
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client1.StartAdvise("QO." & l(i).t & ".TAD$last", 1, True, 60000)
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client1.StartAdvise("QO." & l(i).t & ".TAD$high", 1, True, 60000)
client1.StartAdvise("QO." & l(i).t & ".TAD$low", 1, True, 60000)
client1.StartAdvise("QO." & l(i).t & ".TAD$pclose", 1, True, 60000)
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Next
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MsgBox(ex.Message)
End Try
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Example: for stock AAPL. 1st time enters client_Advise I get open price for AAPL, 2nd time I get high price for AAPL,3rd time I get low price..... and I update the value in the List (l)
This the client_Advise Sub:
Private Shared Sub client1_Advise(ByVal sender As Object, ByVal e As NDde.Client.DdeAdviseEventArgs) Handles client1.Advise
For q As Integer = 0 To l.Count - 1
If l(q).t = w(1) Then
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l(q).Open = "0"
End If
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End If
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End If
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End If
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End If
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l(q).Time = e.Text
End If
Exit For
End If
Next
End Sub
Am I doing something wrong which inreases CPU usage to 80 or 90 % ?
Thanks in advance.

Hi MikeHammadi,
According to your description, you'd like to get data from another app using NDDE library.
When using the NDDE library, the CPU usage is high. As the NDDE library is third-party library, it is not supported here. I suggest you checking if the problem is caused by the NDDE library.
If you'd like to get data from another app. I suggest you could save the data in the dataBase, and then read it in another application if necessary.
If you have any other concern regarding this issue, please feel free to let me know.
Best regards,
Youjun Tang
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SQL query from C++ application using ODBC 10.2.0.4 is very slow

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