Problem with implicitly created Oracle pipes

Hi, I am having a problem with implicitly created Oracle pipes. I am not sure if this is the correct forum for this topic, but I could not see one which suited better..
I am using Oracle pipes as a commiunication mechanism between processes (some are written in PL/SQL and other in PRO*C).
The general problem I have is that if a timeout occurs during the communication process, I end up with 1 or perhaps 2 implicitly created pipes.
The biggest problem for me is that I am unable to determine if a create is implicitly created (via dbms_pipe.send_message or receive_message). This causes problems, since these implicitly created pipes are left behind and not deleted. I'll show you the basic flow of the processes and you shall see my problem.
server: create request pipe "req_pipe"
server: listen for request on requests pipe.
client: create two pipes for comms with server.
client: send request and the names of the newly created pipes to the server.
server: read request and pipename from request pipe (from this point all comms between the client and server are now done over the 2 pipes the client created).
server: send ack message to client to ensure they are still there (since requests can be queued in the request pipe and clients could have timed out before the request is received)
client: send "i'm still here" ack back to the server.
server: process request and send result back to client.
client: send ack back to server to let server know we have received the response.
server: send ack back to client to show that work is now committed.
OK thats the general event flow. I use the rule, that pipes created by a process are removed by a process. So the client always removes the pipes it created in all situations. But since this can happen at any point we can get in the situation:
client: timeout occurs, delete pipes.
server: send message to client (creates an implicit pipe) and therefor works (no errors raised)
server: do a read for response from previous message. (implicitly creates pipe) (will fail).
Now we have two implicitly created pipes! These pipes will exist until the database instance is shutdown, and in a poorly performing environment, we could get thousands of these pipes lying around... not a good situation.
How can I either stop pipes being implicilty created, or how do I detect if a pipe was implicitly created.
I have tried a couple of things, like using v$db_pipes to check if a pipe exists before doing send/reveive calls but this is FAR to slow to do a select on that view.
We have also looked at keeping a record of pipes created by the client then have some process (perhaps the server) clean up these pipes after some time frame. This is a workable solution but is not favourable since it adds extra overhead having to check these pipes often, and created an extra level of complexity which is not required..
Any suggestions will be greatly appreciated.
Feel free to email me with any suggestions on my email provided below, or just post a reply to this formum..
Many thanks,
Karl Bridger
[email protected]

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SQL> set serveroutput on;
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Hope this helps but if not just comer on back.

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I have a problem with my php form that passes the text field to a javascript object. When I copy text from MS Word that includes smart quotes, the form inputs that into the database as ? (upside down) marks. The charset of the DB is WE8MSWIN1252. How do I store these smart quotes as regular quotes? And also if I can do any conversions on the front end (js or php). I tried doing some conversion but to no avail. Any help would be appreciated thank you. “double”

Decide if you want your HTML pages in Windows code page 1252 or Unicode UTF-8. Then, make sure the pages are properly tagged as either "text/html;charset=windows-1252" or "text/html;charset=utf-8". Use HTTP header Content-type or the corresponding <META HTTP-EQUIV=...> tag. Then, set NLS_LANG environment variable for your PHP engine to either AMERICAN_AMERICA.WE8MSWIN1252 or to AMERICAN_AMERICA.AL32UTF8, depending on which encoding you selected for your HTML.
-- Sergiusz

Programming Web Item. Problem with URL creating

Hi,
I am trying to programm a own Web Item.
I derived from the class CL_RSR_WWW_ITEM_VIEW.
Everything is worken fine. I just have a problem with
the creation of links.
In the WAD there is the very nice way of using SAP BW URLs
like:
<SAP_BW_URL cmd="PROCESS_HELP_WINDOW"
help_service="ZPRINTING"
item="TABLE_1"
suppress_repetition_texts=""
P_PREVIEW_MODE=" ">
Is the a method or something similar to do the same with abap?
Greetings
Mike

I found out mayself!
You just have to use the object CL_RSR_PARAMETER.
There you can add parameters.
Then use the method get_url of the object CL_RSR_WWW_PAGE to make a URL string out of it.
Mike

Problems with opening/creating projects

Hi all, this is my first post so Welcome
I have a problem with Photoshop CS4 Extendet. After installing it under Windows 7 when I'm trying to start a new project or open a graphic in Photoshop the only thing which happens is a gray window of project without any graphic, without possibility to work on it etc. I know that graphic is loaded but I can't work on it. When I'm trying to move/large window, it crashes. Here you can see what I see when I load any graphic: http://img231.imageshack.us/img231/6120/61404388.jpg - you can see that photograph is loaded in layers menu section but in window it doesn't appear.
I have used this Photoshop under Windows 7, even same computer some time ago, but with different hard disc. And then it worked properly without any problems. I don't know why now after installing it I have such problems. What can I do? Is it a metter of drivers for graphic cards ot something like that? I'm useing the latest drivers for graphic card and all drivers for Windows and it's components are the newest one.
Here is ma computer specification:
Processor Intel Core i7 920 2.67GHz, 6GB ram, two graphic cards NVIDIA GeForce GTX 285, motherboard Asus P6T Intel X58 Windows 7 Home edition 64 bit.
What should I do now?

As is so often suggested here, check the nVidia web site for updated video drivers for your card. Chances are very good they have already fixed this problem.
-Noel

Problem with Database creating on Oracle 8.1.5 for Linux

I found some error when I use dbassist to create database. (
copy from CD method ) Error dialogue show "CD ROM not detected
". I use both '/cdrom' and '/mnt/cdrom' as cd-rom mount point ,
if this's not correct mount-point. Where should I mount my CD-
ROM ?
null

David Tamburin (guest) wrote:
: Does anyone have a successful installation of Oracle 8.1.5
: running on Red Hat 6.0? I have tried to install it but, I
can't
: get the installer to run. I get java errors when I run,
: runInstaller. I have installed jre1.1.6. Any help would be
: appreciated.
We have gotten it running on two RH6 machines. Took a little
extra work.
Briefly...
* Make sure you use the latest JRE, and try using the one
with native threads (if not you will have to hand edit the
netasst script and remove the -native flag)
* For some reason some of the libs that get installed are
zero length. Find the thread on this forum where someone posted
some sample code to recreate these. If I remember right its the
libjni library. It is a very short easy compile.
* Make sure you got lots of RAM (128 min) and double that in
swap
* Watch for binaries that get installed without the execute
bit set. For instance I think tnslsnr is one of them, as well as
SQLPlus. I can't remember exactly, but that's one other problem
to watch out for.
So far things here are working. I even tried a little java in a
stored procedure. My latest issue is trying to get the PROC
samples to compile.
-Scott
null

Problem with Unicode and Oracle NCLOB fields

When I try to INSERT a new (N)CLOB into an Oracle database, all is fine until I use a non-ASCII character, such as an accented roman letter, like the "�" (that's '\u00E9') in "caf�" or the Euro Currency symbol "?" (that's '\u20AC' as a Java character literal, just in case the display is corrupted here too). This doesn't happen with "setString", but does happen when streaming characters to the CLOB; however, as Oracle or the driver refuse strings larger than 4000 characters, and as I need to support all the above symbols (and many more), I'm stuck.
Here's the background to the problem (I've tried to be detailed, after a lot of looking around on the web, I've seen lots of people with similar problems, but no solutions: I've seen and been able to stream ASCII clobs, or add small NCHAR strings, but not stream NCLOBs...).
I'm using Oracle 9.2.0.1.0 with the "thin" JDBC driver, on a Windows box (XP Pro). My database instance is set up with AL32UTF8 as the database encoding, and UTF8 as the national character set.. I've created a simple user/schema, called LOBTEST, in which I created two tables (see below).
The basic problems are :
- with Oracle and JDBC, you can't set the value of a CLOB or NCLOB with PreparedStatement's setString or setCharacterStream methods (as it throws an exception when you send more than 4000 characters)
- with Oracle, you can only have one LONG VARCHAR-type field per table (according to their documentation) and you MUST read all columns in a set order (amongst other limitations).
- with a SQL INSERT command, there's no way to set the value of a parameter that's a CLOB (implementations of the CLOB interface can only be obtained by performing a SELECT.... but obviously, when I'm inserting, the record doesn't exist yet...). Workarounds include (possibly) JDBC 4 (doesn't exist yet...) or doing the following Oracle-specific stuff :
INSERT INTO MyTable (theID,theCLOB) VALUES (1, empty_clob());
SELECT * FROM MyTable WHERE theId = 1;
...and getting the empty CLOB back (via a ResultSet), and populating it. I have a very large application, that's deployed for many of our customers using SapDB and MySQL without a hitch, with "one-step" INSERTS; I can't feasibly change the application into "three-step INSERT-SELECT-UPDATE" just for Oracle, and I shouldn't need to!!!
The final workaround is to use Oracle-specific classes, described in:
http://download-east.oracle.com/otn_hosted_doc/jdeveloper/904preview/jdbc-javadoc/index.html
...such as CLOB (see my example). This works fine until I add some non-ASCII characters, at which point, irrespective of whether the CLOB data is 2 characters or 2 million characters, it throws the same exception:
java.io.IOException: Il n'y a plus de donn?es ? lire dans le socket
     at oracle.jdbc.dbaccess.DBError.SQLToIOException(DBError.java:716)
     at oracle.jdbc.driver.OracleClobWriter.flushBuffer(OracleClobWriter.java:270)
     at oracle.jdbc.driver.OracleClobWriter.flush(OracleClobWriter.java:204)
     at scratchpad.InsertOracleClobExample.main(InsertOracleClobExample.java:61)...where the error message in English is "No more data to read from socket". I need the Oracle-specific "setFormOfUse" method to force it to correctly use the encoding of the NCLOB field, without it, even plain ASCII data is rejected with an exception indicating that the character set is inappropriate. With a plain CLOB, I don't need it, but the plain CLOB refuses my non-ASCII data anyway.
So, many many thanks in advance for any advice. The remainder of my post includes my code example and a simple SQL script to create the table(s). You can mess around with the source code to test various combinations.
Thanks,
Chris B.
CREATE TABLE NCLOBTEST (
     ID         INTEGER NOT NULL,
     SOMESTRING NCLOB,
     PRIMARY KEY (ID)
CREATE TABLE CLOBTEST (
     ID         INTEGER NOT NULL,
     SOMESTRING CLOB,
     PRIMARY KEY (ID)
package scratchpad;
import java.io.Writer;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Properties;
import oracle.jdbc.driver.OracleDriver;
import oracle.jdbc.driver.OraclePreparedStatement;
import oracle.sql.CLOB;
public class InsertOracleClobExample
     public static void main(String[] args)
          Properties jdbcProperties = new Properties();
          jdbcProperties.setProperty( "user", "LOBTEST" );
          jdbcProperties.setProperty( "password", "LOBTEST" );
//          jdbcProperties.setProperty("oracle.jdbc.defaultNChar","true");
          Driver jdbcDriver = new OracleDriver();
          PreparedStatement pstmt = null;
          Connection connection = null;
          String tableName = "NCLOBTEST";
          CLOB clob = null;
          try
               connection = jdbcDriver.connect("jdbc:oracle:thin:@terre:1521:orcl", jdbcProperties);
               pstmt = connection.prepareStatement("DELETE FROM NCLOBTEST");
               pstmt.executeUpdate();
               pstmt.close();
               pstmt = connection.prepareStatement(
                    "INSERT INTO "+tableName+" (ID,SOMESTRING) VALUES (?,?);"
               clob = CLOB.createTemporary(pstmt.getConnection(), true, CLOB.DURATION_SESSION);
               clob.open(CLOB.MODE_READWRITE);
               Writer clobWriter = clob.getCharacterOutputStream();
               clobWriter.write("Caf? 4,90? TTC");
               clobWriter.flush();
               clobWriter.close();
               clob.close();
               OraclePreparedStatement opstmt = (OraclePreparedStatement)pstmt;
               opstmt.setInt(1,1);
               opstmt.setFormOfUse(2, OraclePreparedStatement.FORM_NCHAR);
               opstmt.setCLOB(2, clob);
               System.err.println("Rows affected: "+opstmt.executeUpdate());
          catch (Exception sqlex)
               sqlex.printStackTrace();
               try     {
                    clob.freeTemporary();
               } catch (SQLException e) {
                    System.err.println("Cannot free temporary CLOB: "+e.getMessage());
          try { pstmt.close(); } catch(SQLException sqlex) {}
          try { connection.close(); } catch(SQLException sqlex) {}
}

The solution to this is to use a third-party driver. Oranxo works really well.
- Chris

Problem with implicitly created Oracle pipes

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