Automatic load balance for oracle RAC

Hi there,
we have application, that use local oracle 9i database and every users use terminal application. That meaning, users do connect to hostname via terminal and invoke application.
We want migrate to RAC with cluster composed with 2 nodes. On every node must be
unique oracle_sid, but database is same on disk array.
My question is how configure users terminal profile which be comensatory automatic load balance .
Thanks

Hi,
This software simulates a real environment.
It creates a schema with tables, sequence, index, functions, etc..
Preferably in a client host it simulates several users (configurable) connecting to the database.
Then the test is simulated like in the real environment.
Check this:
RAC speedup example
This demo shows an example of RAC speedup
http://apex.oracle.com/pls/apex/f?p=44785:24:1688430074669391::NO:24:P24_CONTENT_ID,P24_PREV_PAGE:4946,2
RAC scale example
This demo shows an example of how a 2 node RAC database can scale in performance.
http://apex.oracle.com/pls/apex/f?p=44785:24:1688430074669391::NO:24:P24_CONTENT_ID,P24_PREV_PAGE:4945,2
Regards,
Levi Pereira

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Functional load balancing in oracle RAC

Hi all,
Could anyone suggest how to setup functional load balancing in oracle RAC? Will there be any performance improvement in doing so? I implemented server side load balancing and the performance of INSERT, UPDATE and DELETE are very poor. Will functional load balancing be of any use? Please tell me the steps of how to implement functional load balancing?
Regards,
Aravind
Edited by: Aravind K R on Jul 12, 2011 2:49 PM

Aravind K R wrote:
Hi all,
Could anyone sujjest how to setup functional load balancing in oracle RAC? Will there be any performance improvement in doing so? I implemented server side load balancing and the performance of INSERT, UPDATE and DELETE are very poor. Will functional load balancing be of any use? Please tell me the steps of how to implement functional load balancing?
Regards,
Aravind
Hi,
Load balancing will not necessary increase performance, it just distribute the load more evenly.
Is the DML statement only slow in specific instance?
To prove if there is problem with load balancing, have you tried connect to one instance and perform same DML statement? compare the result
Cheers

Load Balancing for Oracle Apps in linux

Dear all,
I need anykind of information for load balancing (how to do it - architecture) for oracle application in linux environment.
Just for info, the database will be on linux too using RAC (3 machines). I have 4 machines to be use as application tier.
any kind of information will be appriciated.
You can also send it directly to my email account: [email protected] or [email protected]
best regards,
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I'm in the middle of doing this right now. There is a doc on metalink (233428.1) that details the process. I would highly recommend trying this in dev/test env first. Even though the instructions are very straight forward and not very complicated, I'm still having configuration issues.
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Hi!
One of our customers use load balancing, now all users get connected against node 2.
--The configuration of load balancing will be correct I think, have worked before
--How do I verify the load on each node ?
--What can be wrong?
--Need help, what to check?
--tnsnames.ora looks like
X.world =
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(CONNECT_DATA =
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(SERVICE_NAME = X.X.se)
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T

Hi,
--The configuration of load balancing will be correct I think, have worked before
--How do I verify the load on each node ?
--What can be wrong?
--Need help, what to check?
Services
Traditionally an Oracle database provided a single service and all users connected to the same service.
A database will always have this default database service that is the database name.This service cannot be modified and will always allow you to connect to the database.
Do not use the default database service, create at least one service.
With Oracle Database 11g, a database can have many services (up to a maximum of 115 per database).
The services hide the complexity of the cluster from the client by providing a single system image for managing work. Applications and mid-tier connection pools select a service by using the Service Name in their connection data.
http://www.oracle.com/technetwork/database/clustering/overview/awmrac11g-133673.pdf
http://download.oracle.com/docs/cd/B28359_01/rac.111/b28254/hafeats.htm
Regards,
Levi Pereira

Load Balancing for Oracle Release 11i

Hi there,
I am trying to find some recommendations on the need for load balancing in the middle tier for a 3 tier Oracle Release 11i implementation. Here are the questions that I have.
1. Is load balancing very common for a 11i implementation ?
2. What are the probable issues that one might encounter if there is no load balancing ?
3. If there is load balancing how many servers are generally used for the same ?
4. Do we only install Forms server on multiple servers or we install WebDB and Apache on all the servers ?
5. Is it true that Web servers are the most likely to be down and thus mandating the use of load balancing ? If that is true, would it be prudent to install Web Server and Form Server on each server m/c and in the process having redundant servers ?
Let me know your thoughts.
Thanks,
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Cache and Load Balancing for Oracle APEX Listener

Hi,
I intend to use only HTTP access.
The database I use is Oracle11gR2 SE 32bit.
How to implement a Cache and Load Balancing with the Oracle APEX Listener?
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Kind Regards.

Error. To be closed.

Load Balancing for EBS R12

Hi husssein,
I have a pc shuttle with test EBS R12 on RHEL4.6.
I want to practise/test installing "appsTier Load Balancing" because this is one of our client's requirement.
I have 1 laptop and i can borrow another from my officemate. I will install rhel4.6 both on the 2 laptops.
Is it possible to simulate testing on "appsTier Load Balancing" using the 2 laptops? and the dbTier resides on the
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Hi,
Well, from your experience, which is difficult to setup/configure > Load Balancer or RAC?I would not compare, but personally I believe configuring load balancing is more straightforward.
By the way the term "RAC" is quite misleading. It means "Real Application Cluster" and yet it is used or point to the database Tier, when is should be on tha AppsTier because of the word "Application".
So why cannot they RAC the AppsTier?As mentioned above, RAC is a database feature which means you will need to have an Oracle database installed (Enterprise Edition) to configure RAC. For the application tier, you will have to use load balancing. Both RAC and Load balancing are forms of Clustering.
Regards,
Hussein

Gig Ethernet V/S SCI as Cluster Private Interconnect for Oracle RAC

Hello Gurus
Can any one pls confirm if it's possible to configure 2 or more Gigabit Ethernet interconnects ( Sun Cluster 3.1 Private Interconnects) on a E6900 cluster ?
It's for a High Availability requirement of Oracle 9i RAC. i need to know ,
1) can i use gigabit ethernet as Private cluster interconnect for Deploying Oracle RAC on E6900 ?
2) What is the recommended Private Cluster Interconnect for Oracle RAC ? GiG ethernet or SCI with RSM ?
3) How about the scenarios where one can have say 3 X Gig Ethernet V/S 2 X SCI , as their cluster's Private Interconnects ?
4) How the Interconnect traffic gets distributed amongest the multiple GigaBit ethernet Interconnects ( For oracle RAC) , & is anything required to be done at oracle Rac Level to enable Oracle to recognise that there are multiple interconnect cards it needs to start utilizing all of the GigaBit ethernet Interfaces for transfering packets ?
5) what would happen to Oracle RAC if one of the Gigabit ethernet private interconnects fails
Have tried searching for this info but could not locate any doc that can precisely clarify these doubts that i have .........
thanks for the patience
Regards,
Nilesh

Answers inline...
Tim
Can any one pls confirm if it's possible to configure
2 or more Gigabit Ethernet interconnects ( Sun
Cluster 3.1 Private Interconnects) on a E6900
cluster ?Yes, absolutely. You can configure up to 6 NICs for the private networks. Traffic is automatically striped across them if you specify clprivnet0 to Oracle RAC (9i or 10g). That is TCP connections and UDP messages.
It's for a High Availability requirement of Oracle
9i RAC. i need to know ,
1) can i use gigabit ethernet as Private cluster
interconnect for Deploying Oracle RAC on E6900 ? Yes, definitely.
2) What is the recommended Private Cluster
Interconnect for Oracle RAC ? GiG ethernet or SCI
with RSM ? SCI is or is in the process of being EOL'ed. Gigabit is usually sufficient. Longer term you may want to consider Infiniband or 10 Gigabit ethernet with RDS.
3) How about the scenarios where one can have say 3 X
Gig Ethernet V/S 2 X SCI , as their cluster's
Private Interconnects ? I would still go for 3 x GbE because it is usually cheaper and will probably work just as well. The latency and bandwidth differences are often masked by the performance of the software higher up the stack. In short, unless you tuned the heck out of your application and just about everything else, don't worry too much about the difference between GbE and SCI.
4) How the Interconnect traffic gets distributed
amongest the multiple GigaBit ethernet Interconnects
( For oracle RAC) , & is anything required to be done
at oracle Rac Level to enable Oracle to recognise
that there are multiple interconnect cards it needs
to start utilizing all of the GigaBit ethernet
Interfaces for transfering packets ?You don't need to do anything at the Oracle level. That's the beauty of using Oracle RAC with Sun Cluster as opposed to RAC on its own. The striping takes place automatically and transparently behind the scenes.
5) what would happen to Oracle RAC if one of the
Gigabit ethernet private interconnects fails It's completely transparent. Oracle will never see the failure.
Have tried searching for this info but could not
locate any doc that can precisely clarify these
doubts that i have .........This is all covered in a paper that I have just completed and should be published after Christmas. Unfortunately, I cannot give out the paper yet.
thanks for the patience
Regards,
Nilesh

Setting up Load Balancing for 11i for Intranet & Internet Access

Our current environment for 11i (11.5.5) is accessed only internally (via Intranet). We need to allow outside access (via Internet) also for self-service apps (ie. HR). Oracle Support/Metalink has stated that Load Balancing (note 148155.1) is the only supported method to have multiple (Apps Servers) systems access a single database. Could I get feedback from anyone who has implemented Load Balancing for 11i? Additionally if someone has implemented this for both intranet and internet access how has your company setup? Do the secondary server(s) from the Load Balancing note reside in the DMZ? And thus the primary app server and database reside inside the firewall? Thanks....

Hi,
We are using 6 middle tiers for internal access for intranet access and 2 middle tiers in External DMZ with only web server running for Extrenal Access over Internet for Self Service.
You Implement one Load Balancer for first 6 internal Middle Tiers with site level profiles pointing to Internal .
You implement second Load balancer for external 2 middle tiers with server level profile options for these two servers pointing to External Load balancer .
To check how to implement load balancer vsiit
http://becomeappsdba.blogspot.com/2006/09/configure-hardware-load-balancer-at.html
Wait for my next post in above blog site with step by step procedure to implement above solution External & Internal one
Atul Kumar
Oracle Apps DBA
http://teachmeoracle.com

Any Oracle best practice/standards for inter-DataCente links for Oracle RAC

Hello Oracle Experts,
Am working for a customer to set up Oracle RAC architecture hosting SAP/Non-SAP applications per SLA levels(MC/BC/Standard) specs. Currently my network team needs calculation to arrive at whether we will go for a (1), (2) or (3) 10Gig links for inter DC (Data-Center) for Oracle RAC.. below is additional background:
•     Porting all client SAP/Non-SAP Oracle databases to new 2 data-centers.
•     There will be 10 blades (4x BL680s and 6x BL460s) in each DC (can scale-up/out later on).
•     Clusters architecture to support Extended/Stretched RAC cluster feature
•     Clusters 2-node each(1-datacenter1, 1-datacenter2) and nodes distributed across 2 x c7000 such that no cluster has more than one node in an enclosure.
•     Each node will have - 4 NIC ports ( 2 x public and 2 x private) , 2 dual-port HBA
•     Oracle ASM/ACFS (ASM Cluster File System), Voting Disk, OCR and Database files
•     the versions are Oracle 11g RAC, Oracle 10g RAC and Oracle 9i (for DataGuard/Standby) on RHEL 6 on Proliant Blades (x86) + BladeMatrix
My network colleagues considering using DWDM across the 2 DCs(given the lesser cost?). Am still looking around if there are any Oracle/industry-best practices around this and having a calculation to support that..
Many Thanks in advance..
Regards,
Abhijit

Hi ,
There are no specific set of steps / practices for batch loading contents to ucm . It would be very much dependent on how many contents does the user have to load to UCM and how well the server is configured in terms of performance .
You can get more details from the following documentation link : http://docs.oracle.com/cd/E21043_01/doc.1111/e10792/c02_settings009.htm
Thanks,
Srinath

What is the alternative of F5 BIG-IP LTM Load Balancer for OEM 12c

We want to implement service load balance, however oracle recommended
F5 BIG-IP LTM Load Balancer for OEM 12c
How much it is cost? and is there any free alternative we can use which supported by Oracle?
Thanks

Apart from F5, Cisco is another SLB vendor. I am not sure about any free alternative though.
Note that regardless what SLB that you pick, it should meet the requirements documented in section 29.3.2.2 of the EM12c Release 3 Administrator's Guide:
The SLB must provide support for multiple virtual server ports. Enterprise Manager typically requires that up to 4 ports are configured on the SLB (Secure Upload, Agent Registration, Secure Console, Unsecure Console)
Support for persistence. HTTP and HTTPS traffic between the browser and the OMS requires persistence
Support for application monitoring. The SLB must be capable of monitoring the health of the OMSs and detecting failures, so that requests will not be routed to OMSs that are not availa
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- Loc

How to configure software load balancer for R12.1.3

Dear All,
I need to configure software load-balancer on application tiers and i need to know if its possible to have a software load-balancer in place of hardware load balancer if i need to route the load on two application nodes.
Thanks !

As we do not certify, nor support 3rd party loadbalancers we can not confirm that the Piranha loadbalancer will perform as expected with EBS. The basic minimum requirements or loadbalaning is that it has death detection, and session / cookie persistence We also typically require that a hardware loadbalancer is used. Internally we use F5 loadbalancers, and Cisco ACE.
What are the limitations of a software load balancer compared to hardware ? As mentioned above, your software balancer should has the capability of "death detection, and session/cookie persistence" -- More details can be found in (Implementing Load Balancing On Oracle E-Business Suite - Documentation For Specific Load Balancer Hardware [ID 727171.1]).
Oracle Web Cache can be used as a software load balancer (which is an Oracle product), but Oracle recommends you do not use it in production instances.
Thanks,
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OIM 9.1.0.2 - Weblogic JDBC Multi Data Sources for Oracle RAC

Does OIM OIM 9.1.0.2 BP07 support Weblogic JDBC Multi Data Sources (Services>JDBC>Multi Data Sources) for Oracle RAC instead of inserting the "Oracle RAC JDBC URL" on JDBC Data Sources for xlDS and xlXADS (Services>JDBC>Data Sources> xlDS|xlXADS > Connection Poll> URL) ?
If yes, is there are any other modifications that need to be made on OIM, or just changing the data sources?

Yes, it's supported. You install against one instance directly of the Rac Server. Then you update the config.xml file and the jdbc resource in your weblogic server with the full rac address. It is documented for installation against RAC. http://docs.oracle.com/cd/E14049_01/doc.9101/e14047/database.htm#insertedID2
-Kevin

Encountered ora-29701 during Sun Cluster for Oracle RAC 9.2.0.7 startup (UR

Hi all,
Need some help from all out there
In our Sun Cluster 3.1 Data Service for Oracle RAC 9.2.0.7 (Solaris 9) configuration, my team had encountered
ora-29701 *Unable to connect to Cluster Manager*
during the startup of the Oracle RAC database instances on the Oracle RAC Server resources.
We tried the attached workaround by Oracle. This workaround works well for the 1^st time but it doesnt work anymore when the server is rebooted.
Kindly help me to check whether anyone encounter the same problem as the above and able to resolve. Thanks.
Bug No. 4262155
Filed 25-MAR-2005 Updated 11-APR-2005
Product Oracle Server - Enterprise Edition Product Version 9.2.0.6.0
Platform Linux x86
Platform Version 2.4.21-9.0.1
Database Version 9.2.0.6.0
Affects Platforms Port-Specific
Severity Severe Loss of Service
Status Not a Bug. To Filer
Base Bug N/A
Fixed in Product Version No Data
Problem statement:
ORA-29701 DURING DATABASE CREATION AFTER APPLYING 9.2.0.6 PATCHSET
*** 03/25/05 07:32 am ***
TAR:
PROBLEM:
Customer applied 9.2.0.6 patchset over 9.2.0.4 patchset.
While creating the database, customer receives following error:
ORA-29701: unable to connect to Cluster Manager
However, if customer goes from 9.2.0.4 -> 9.2.0.5 -> 9.2.0.6, the problem does not occur.
DIAGNOSTIC ANALYSIS:
It seems that the problem is with libskgxn9.so shared library.
For 9.2.0.4 -> 9.2.0.5 -> 9.2.0.6, the install log shows the following:
installActions2005-03-22_03-44-42PM.log:,
[libskgxn9.so->%ORACLE_HOME%/lib/libskgxn9.so 7933 plats=1=>[46]langs=1=> en,fr,ar,bn,pt_BR,bg,fr_CA,ca,hr,cs,da,nl,ar_EG,en_GB,et,fi,de,el,iw,hu,is,in, it,ja,ko,es,lv,lt,ms,es_MX,no,pl,pt,ro,ru,zh_CN,sk,sl,es_ES,sv,th,zh_TW, tr,uk,vi]]
installActions2005-03-22_04-13-03PM.log:, [libcmdll.so ->%ORACLE_HOME%/lib/libskgxn9.so 64274 plats=1=>[46] langs=-554696704=>[en]]
For 9.2.0.4 -> 9.2.0.6, install log shows:
installActions2005-03-22_04-13-03PM.log:, [libcmdll.so ->%ORACLE_HOME%/lib/libskgxn9.so 64274 plats=1=>[46] langs=-554696704=>[en]] does not exist.
This means that while patching from 9.2.0.4 -> 9.2.0.5, Installer copies the libcmdll.so library into libskgxn9.so, while patching from 9.2.0.4 -> 9.2.0.6 does not.
ORACM is located in /app/oracle/ORACM which is different than ORACLE_HOME in customer's environment.
WORKAROUND:
Customer is using the following workaround:
cd $ORACLE_HOME/rdbms/lib make -f ins_rdbms.mk rac_on ioracle ipc_udp
RELATED BUGS:
Bug 4169291

Check if following MOS note helps.
Series of ORA-7445 Errors After Applying 9.2.0.7.0 Patchset to 9.2.0.6.0 Database (Doc ID 373375.1)

Reverse Proxy and Load Balancer for SMP 2.3 and Agentry Application

Hi Expert,
I'm putting in place a mobile solution composed by SMP 2.3 SPS 4 and SAP ECC 6.0. In the SMP 2.3 I created the agentry server and I have deployed my agentry application.
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g.

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Automatic load balance for oracle RAC

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