473,837 Members | 1,541 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Distributed transactions and Oracle RAC load balancing problems - advice needed!

During deployment of an application using distributed transactions managed
under COM+ on an Oracle 9i RAC database, we encounter situations where the
load balancing mechanisms in the RAC result in that the component context in
the distributed transaction (in our case two different COM components)
cannot hold onto the same ODBC connection. Or it may be that the database
session is changed dynamically for the ODBC connection, so that component 2
in the transaction cannot read updates made by component 1 in the
transaction.

Originally we use MS ODBC driver for Oracle (2.573.9030.00) , and Oracle XA
(9.2.0.1.0). We have investigated Oracle's ODBC driver (9.02.00) ,
EasySoft's ODBC driver and DataDirect's ODBC driver to find if any of these
can ensure that the same session is held for the connection during the
entire lifetime of the transaction. It seems that BEA with WebLogic has
solved the solution with their JDBC connection pool configuration (parameter
KeepXAConnTillT XComplete).

Has anyone else run into this problem and found a solution or work-around?
According to Oracle's promo documents no application changes should be
needed for using the RAC option.

Br,

Eirik
Jul 19 '05 #1
1 8223
Eirik Tryggeseth wrote:
During deployment of an application using distributed transactions managed
under COM+ on an Oracle 9i RAC database, we encounter situations where the
load balancing mechanisms in the RAC result in that the component context
in the distributed transaction (in our case two different COM components)
cannot hold onto the same ODBC connection. Or it may be that the database
session is changed dynamically for the ODBC connection, so that component
2 in the transaction cannot read updates made by component 1 in the
transaction.

Originally we use MS ODBC driver for Oracle (2.573.9030.00) , and Oracle
XA
(9.2.0.1.0). We have investigated Oracle's ODBC driver (9.02.00) ,
EasySoft's ODBC driver and DataDirect's ODBC driver to find if any of
these can ensure that the same session is held for the connection during
the entire lifetime of the transaction. It seems that BEA with WebLogic
has solved the solution with their JDBC connection pool configuration
(parameter KeepXAConnTillT XComplete).

Has anyone else run into this problem and found a solution or work-around?
According to Oracle's promo documents no application changes should be
needed for using the RAC option.


My God, you didn't actually *believe* those promo documents, did you?????!

Sorry, but that's just a bit naiive.

ODBC does not failover properly in a RAC environment without a lot of
handholding, at least in my (somewhat limited, admittedly) experience.
Meaning that the very idea of running an ODBC app on RAC is... well, the
word "brave" comes to mind.

So... good luck, basically. I hope you get the technical help you need from
elsewhere on this group, but I wouldn't be holding my breath.

Regards
HJR

Jul 19 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

2
3716
by: jayPLEASEtylerNOwilliamsSPAM | last post by:
Hi, I set up PHP 4.xx using Apache 1.3 on Windows XP to begin a project. The project now needs to be moved to a real test box. Admittedly, I am not quite sure how I was able to access Oracle on my machine, but I know I have the Oracle client installed, have two odbc DSNs (CAI/PT Oracle 8) installed and uncommented php_oci8.dll and php_oracle.dll. Other than that, I kind of just played around until it worked. Now my code needs to be...
0
2283
by: Constandinos Mavromoustakis | last post by:
CFP: CLADE 2004-Challenges of Large Applications in Distributed Environments ------------------------------------------------- PhD student - Dept.Informatics at Aristotle University of Thessaloniki URL-> http://agent.csd.auth.gr/~cmavrom -------------------------------------------------- -------------------------CLADE 2004--------------------------- Challenges of Large Applications in Distributed Environments June 7th, 2004, Honolulu,...
7
13914
by: Prashanth | last post by:
Hi, We are facing some issues in COM+ deployment. We get system error "Unable to enlist in a distributed transaction" . It has a very inconsistant behaviour. On refreshing the screens couple of times, the error disappears.Also it reappears abruptly giving an impression that the transaction failed although the changes are commited to the database.Please let me know if any of you have faced it before. This is a .Net Application with...
2
4857
by: yagish | last post by:
Hi Techies, Am really new with the Oracle 9i Forms and am searching for a way to perform Load Balancing in Oracle 9i Forms Application. Its not a J2EE application, so cannot go the OC4J way. I need Load Balancing at 2 levels - 1) Load Balancing of the Forms Server 2) Load Balancing of the Database
7
2390
by: Richard Maher | last post by:
Hi, I am seeking the help of volunteers to test some software that I've developed which facilitates distributed two-phase commit transactions, encompassing any resource manager (e.g. SQL/Server or Oracle) controlled by Microsoft's Distributed Transaction Coordinator in a Windows2000 environment, with any resource manager under the control of DECdtm (e.g. Rdb (or Oracle via the XA Veneer)) in a VMS environment.
1
4208
by: Rick | last post by:
I'm having problems with EnterpriseServices transactions running against Oracle 9iR2. I am inconsistently getting Oracle ORA-24761: Transaction Rolled Back results mid-transaction. If I start the transaction and run it against an object it might fail. If I rerun the same transaction again it might work. But on trying again it might fail. If I disable transactions <Transaction(TransactionOption.Disabled)> the app runs and all the data...
0
1554
by: HK | last post by:
I'm wanting to get rid of a hardware load balancer and just use the Windows 2003 software load balancing with 2003 Server Web Edition. I'm wondering if anyone here uploads ASP.NET code to 2 or more servers that are load balanced by Windows Server Network Load Balancing (software load balancing on Windows 2003). If so, or if you're sure of the answer anyway for windows-based load balancing, here's the questions: Can you do just one...
4
2851
by: Ronald Green | last post by:
Hi, I have this theoretical problem: Say that I need a chat server that also has a database where it saves all conversations. However, I need several servers for availability and load balancing. Now arises the problem of how to synchronize the servers in the shortest interval (synchronize databases that is). I'm not sure that merge or peer-to-peer replication in sql 2005 is the best solution for synchronization (because it still has a...
1
717
by: Eirik Tryggeseth | last post by:
During deployment of an application using distributed transactions managed under COM+ on an Oracle 9i RAC database, we encounter situations where the load balancing mechanisms in the RAC result in that the component context in the distributed transaction (in our case two different COM components) cannot hold onto the same ODBC connection. Or it may be that the database session is changed dynamically for the ODBC connection, so that...
0
9683
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
10882
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
10577
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
10630
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
10275
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
1
7811
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5670
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
5851
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
2
4045
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.