RAC Load Balancing Issue

Experts,
We are using 9i RAC database(2 Nodes). Our Problem is Node1 is not getting too much connections,
but node2 is getting too much connections.
Difference between these two is around 400
example
Node1 ---> 70
Node2 ---> 465
How i could solve this issue?
Thanks
R.Sundaravel

It depends on how you have defined Load Balancing.
If you have client-side load balancing (e.g. with LOAD_BALANCE=ON in the tnsnames.ora file), it is the client(s) that decide which node to connect to. If you have server-side load balancing (e.g. with the database instances and listeners cross-registered such that the database instance PMON update both listeners), the listeners would be able to redirect client connections to the "less loaded" node.
Hemant K Chitale

Similar Messages

Rac load balance

Dear Gurus
my database 10.2.0.4 and rac is configured.
database is working fine.actually rac is installed from last 3 years and database is running fine.
But when we see cpu usage on both nodes by command sar -r ,cpu usage on node 2 is less than node1
so my boss is saying that load balancing is not happening.
Could anybody tell me how could i check whether load balancing is fine on both nodes or is it like some master node concept.
Please give some ideas to test the same as in my opinion load balancin is working fine but i don't know how do i check it

Hi
So, you are trying to achieve uniform CPU usage among the RAC nodes using RAC load balancing techniques?
I am afraid, answer to your problem is not simple. Do you use Services to load balance? If yes, how is the CLB_GOAL and GOAL (run time) is setup for the services? You could potentially use services and load balancing goal to keep the CPU usage uniform.
But, this becomes more complex in connection pool environments. In connection pool, connections are created at an accelerated pace. PMON updates the listener with Load Balancing Advisory data every 3 seconds or so, and if the connections arriving within that 3 seconds, then the listener does not get correct LBA and So, the listener might redirect the connection to the node already heavily loaded. You could control the this damage by introducing delays between the connection pool logins in such a way that PMON has enough time to update the listener.
Even then, In theory, you could have imbalanced CPU usage. For example, let's say that application created 50 connections to instance 1 and 50 connections to instance 2. Now, some part of the application is going to have more CPU usage, then the others. If accidentally, all those connections borrowed by those CPU intensive components, are from one instance, then CPU usage will be higher. I guess, what I am saying is that connection pools do not know underlying instance load and might not distribute the workload.
I will ask the question differently. Were you able to identify exactly what is causing the increased CPU usage in the heavily loaded node? Are you sure that it is the application? If yes, you could potentially configure more services so that you can differentiate the CPU usage at the service level.
Now, the ultimate question is, do you see this imbalance causing performance issue?
Hope this helps,
Cheers
Cheers
Riyaj Shamsudeen
Principal DBA,
Ora!nternals - http://www.orainternals.com - Specialists in Performance, RAC and EBS
Blog: http://orainternals.wordpress.com
Oracle ACE Director and OakTable member http://www.oaktable.com
Co-author of the books: Expert Oracle Practices, Pro Oracle SQL, Expert PL/SQL Practice
Join me: Advanced RAC seminar - see blog.

Oracle RAC load balancing advisory services query

Hi,
I have a query on RAC load balancing advisory.
Is it possible to create a service for exeuction of a PL/SQL package?
We have UNIX batches which are set of PL/SQL packages that may or may not be linked are executed daily. These batches consumes lots of resources.
So i want to configure my services such that say pkg1 will go to node1 and pkg2 will go to node2 and so on and so forth.
Is it possible to achieve this with Net services and LBA?
If not, is there any other way i can do this?
Thanks
AT
Message was edited by:
Amit Trivedi

Hi, my answers are:
Is it possible to create a service for exeuction of a PL/SQL package?Yes, that is posible, you can create a service for execute PL/SQL Packages, in fact you can create any service that you need and assign the resources and priorities for this service.
Is it possible to achieve this with Net services and LBA?Yes, thats posible, you define the priorities at service level and where the service must run at node level.
If not, is there any other way i can do this?Yes, if you dont wish using the LBA and services you will must create statict definition into tnsnames file for operate connection string and indicate where must connect the session for execute the package.
Luck.
Have a good day.
Regards.

ITS load balancing issue

Hi all,
During our testing we are getting a load balancing issue. However, one of the agates in our network is has more CPU power than compared to the other agates in our ITS network. The memory on all the agate servers is the same.
Our current issue we are getting is the one agate that has more cpu power but acquires more sessions as compared to the other two agates. It roughly gets 60 more sessions per agate process as compare to the other Agate servers. Does having more cpu on a Agate affect the load balancing on ITS? We are on ITS patch level 19 with the Hotfix.
Thanks,
Jin Bae

Hello Jin,
yes, at (re)initialize the WGate retrieves the capacity from the AGates.
This is an accumulated number based on CPU performance and the number of CPUs!
The number can be seen in "wgate-status" as the "Capacity" of the AGate.
When running multiprocess Agates the number is retrieved from the MManager and also involves the number of agate-processes.
The WGate dispatches the load in proportion depending on these capacity numbers.
By my knowledge there is no way that these values can be configured (fixed).
Regards,
Fekke

SIP load balancing issue with ACE 4710

SIP Load balancing Issue with ACE 4710
I have a Cisco ace 4710 with vesion Version A4(2.2). i configued simple SIP load balancing first without stickiness. without stikeiness we are having a problem because bye packet at the was not going to the same server all the time that left our port in used even though user hang up the phone. its happen randmly. i have a total 20 licenced ports and its fill out very quickly. so i dicided to use the stickiness with call-ID but still same issue. below is the config
rserver host CIN-VOX-31
ip address 172.20.130.31
inservice
rserver host CIN-VOX-32
ip address 172.20.130.32
inservice
serverfarm host CIN-VOX
probe SIP-5060
rserver CIN-VOX-31
    inservice
rserver CIN-VOX-32
    inservice
sticky sip-header Call-ID VOX_SIP_GROUP
timeout 1
timeout activeconns
replicate sticky
serverfarm CIN-VOX
class-map match-all CIN_VOX_L4_CLASS
2 match virtual-address 172.22.12.30 any
class-map match-all CIN_VOX_SIP_L4_CLASS
2 match virtual-address 172.22.12.30 udp eq sip
policy-map type loadbalance sip first-match CIN_VOX_LB_SIP_POLICY
class class-default
    sticky-serverfarm VOX_SIP_GROUP
policy-map multi-match GLOBAL_DMZ_POLICY
   class CIN_VOX_SIP_L4_CLASS
    loadbalance vip inservice
    loadbalance policy CIN_VOX_LB_SIP_POLICY
    loadbalance vip icmp-reply
class CIN_VOX_L4_CLASS
    loadbalance vip inservice
    loadbalance policy CIN_VOX_LB_SIP_POLICY
    loadbalance vip icmp-reply
interface vlan 20
description VIP_DMZ_VLAN
ip address 172.22.12.4 255.255.255.192
alias 172.22.12.3 255.255.255.192
peer ip address 172.22.12.5 255.255.255.192
access-group input PERMIT-ANY-LB
service-policy input GLOBAL_DMZ_POLICY
could you please help me on this...
thanks
Rakesh Patel

I mean there should be one more statement-
class-map type sip loadbalance match-any CIN_VOX_LB_SIP_POLICY
match sip header Call_ID header-value sip:
and that will be called under-
policy-map multi-match GLOBAL_DMZ_POLICY
   class CIN_VOX_SIP_L4_CLASS
    loadbalance vip inservice
    loadbalance policy CIN_VOX_LB_SIP_POLICY
    loadbalance vip icmp-reply
is that missing in your config ?

CSS arrowpoint cookie load balancing issue

Hi guys,
I need some advice on a load balancing issue.
We have connections hitting the CSS via a proxy environment. As a result i see only one source ip address. I want to use arrowpoint cookies for session stickeyness. However when i enable the rule the tcp session negotiation fails. The CSS sends a TCP/RST which terminates the session.
Here's the rule config:
content HTTP_rule
add service ZSTS299102
add service ZSTS281101
vip address <filtered>
add service LONS299102
add service LONS281101
balance weightedrr
change service ZSTS299102 weight 5
change service ZSTS281101 weight 5
advanced-balance arrowpoint-cookie
protocol tcp
port 80
url "/*"
active
Any help would be much appreciated.

Remko,
in L3/L4 the CSS sends the SYN directly to the server.
So when the FIN comes in, we simply pass it to the server.
With L5 the CSS spoofs the connection and we select the server only after receiving the GET.
If there was some delay between the GET and the FIN, the CSS would have time to establish a connection with the server and the FIN could be simply forwarded.
Unfortunately, in this case the FIN is right after the GET with no delay.
Gilles.

XDOLoader on RAC / Load balancer

Hi all,
I'm busy with creating an installation script for installing all kinds of objects.
There are also some XML Publisher objects that need to be installed trough XDOLoader.
This installation script has to be dynamic as there are 9 environments that are all 9 in RAC / Load balancing.
Now the problem is that XDOLoader requires an JDBC connection string and I have to 'build up' is this string in my script.
Some will propose to use $TWO_TASK for the SID. And yes, that's a good proposal, but as I'm on load balancing the $TWO_TASK environment variable does not contain an SID...
Also the JDBC_URL from the dbc file does not work.
Does anybody has some experience with using XDOLoader in an RAC / Load balanced environment?
Or any proposals how to get your JDBC string dynamically builded without using $TWO_TASK ?
Thanks in advance
Regards,
Stijn

Hi,
Can you please give me some more information about your setup ...
Something like ...
F5/LB --> Apache or OHS --> WebLogic Cluster..
If you are using F5/OHS directly to WebLogic cluster you can try enabling the session persistence and this problem should go away..
If you are using plain Apache or OHS try putting "DynamicServerList" off.
Let me know something more about setup so that i can contribute to help ..thanks.

Load Balancing issue on RAC setup

1. We have a Oracle RAC cluster having two node say node1-vip and node2-vip
2. We have two client software (both uses weblogic as app server) say ANP and HDM
3. We configure connect string for HDM by giving node1-vip as primary and node2-vip as secondary. Here is the connect string we provide
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip)(PORT=1521))(FAILOVER=on)(LOAD_BALANCE=off))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME= anpdb)))
4. We configure connect string for ANP by giving node2-vip as primary and node1-vip as secondary. Here is the connect string we provide
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip)(PORT=1521))(FAILOVER=on)(LOAD_BALANCE=off))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME= anpdb)))
We are observing that connection for HDM is only going to node1-vip however connection for ANP sometime goes to only node2-vip however sometime it is getting distributed between node1-vip and node2-vip. Whenever there is more connection on node1-vip than node2-vip then connection for ANP is only going to node2-vip however whenever number of connection at node2-vip is equal or greater than node-1 vip, connection for ANP gets distributed between node1-vip and node2-vip
Thanks
Sumit

Hi,
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=node1-vip)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=node2-vip)(PORT=1521))(FAILOVER=on)(LOAD_BALANCE=off))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME= anpdb)))
Why have you put *(LOAD_BALANCE=off)* ?
And from your post, you are not trying to use actual load balancing.
You are trying to give connectivity like this HDM->node 1 and ANM->node 2
In that case you need tp specify only one server vip address.
When you configure the connection entries like above, when a new user session connection is requested, listener will connect the user to whichever address is reachable at that time.
Hope you got my point...
Regards,
Mahesh.

Oracle RAC Load Balancing

I have Oracle 10g RAC database with 6 node installed. Now i want to do load balaning for few users not for all.
Suppose i have users a,b,c,d & e are there and i want to redirect the login of users a,c & e throgh node 5. How can i achieve this using server side load balancing ?
Thanks in Advance.

973407 wrote:
I have Oracle 10g RAC database with 6 node installed. Now i want to do load balaning for few users not for all.
Suppose i have users a,b,c,d & e are there and i want to redirect the login of users a,c & e throgh node 5. How can i achieve this using server side load balancing ?
Thanks in Advance.Create a service for each group, entering that service name in the connect string, and providing those users with the appropriate tnsnames.ora or application.
You middle-tier could handle this using the correct jdbc connection based on some info retrieved from the database. I will leave it up to you to take the suggestions and figure out how to develop the scenario you described.
Isn't It is also about time you upgraded to something that is still supported? 11g will make some of these issues a whole lot easier. You CAN use 11g Cluster/ASM with your 10g database until you can get your db upgraded. I have upgraded a boat-load of 10g databases to 11g - always < 2hrs start to finish. In many cases converting from single-instance to RAC in the same upgrade session. YMMV.

Load-balancing issues with iPlanet and multiple clusters

We're in performance test of a large-scale clustered deployment based on WLS 5.1sp10.
Due to scalability/functionality issues, some of which we've seen firsthand and
some of which we've been informed of by associates as well as BEA representatives,
we've chosen to implement multiple clusters with a maximum of three nodes each.
These clusters will be fronted by a web server tier consisting of iPlanet servers
using the proxy plugin.
Due to hardware constraints (both in test and in production), however, we've configured
the iPlanet servers to route across the multiple clusters. In our test environment,
for instance, we've got a single iPlanet server routing across two 3-node clusters,
and the configuration in obj.conf is as follows:
<Object name="application" ppath="*/application">
Service fn="wl-proxy" \
WebLogicCluster="clusterA_1:9990,clusterB_1:9991,clusterA_2:9990,clusterB_2:9991,clusterA_3:9990,
clusterB_3:9991" \
CookieName="ApplicationSession"
</Object>
Our issue is that the load-balancing doesn't appear to work across the clusters.
We're seeing one cluster get about 90% of the load, while the other receives
only 10%.
So, the question (finally!) is: Is this configuration correct (i.e., will it
work according to the logic of the proxy plugin), and is it appropriate for this
situation? Are there other alternative approaches that anyone can recommend?
Thanks in advance,
cramer

I use weblogic6.1 with sp2+windows 2000.I develop a web application and deploy
it to cluster.Through HttpClusterServlets proxy of weblogic I found that a server
in cluster almost get 95% of requests but another only get 5% of requests.Why???
I don't set any special parameter.And the weight of the two clustered server is
equal.I use round-robin arithmetic.
Thanks!
"cramer" <[email protected]> wrote:
>
We're in performance test of a large-scale clustered deployment based
on WLS 5.1sp10.
Due to scalability/functionality issues, some of which we've seen firsthand
and
some of which we've been informed of by associates as well as BEA representatives,
we've chosen to implement multiple clusters with a maximum of three nodes
each.
These clusters will be fronted by a web server tier consisting of iPlanet
servers
using the proxy plugin.
Due to hardware constraints (both in test and in production), however,
we've configured
the iPlanet servers to route across the multiple clusters. In our test
environment,
for instance, we've got a single iPlanet server routing across two 3-node
clusters,
and the configuration in obj.conf is as follows:
<Object name="application" ppath="*/application">
Service fn="wl-proxy" \
WebLogicCluster="clusterA_1:9990,clusterB_1:9991,clusterA_2:9990,clusterB_2:9991,clusterA_3:9990,
clusterB_3:9991" \
CookieName="ApplicationSession"
</Object>
Our issue is that the load-balancing doesn't appear to work across the
clusters.
We're seeing one cluster get about 90% of the load, while the other
receives
only 10%.
So, the question (finally!) is: Is this configuration correct (i.e.,
will it
work according to the logic of the proxy plugin), and is it appropriate
for this
situation? Are there other alternative approaches that anyone can recommend?
Thanks in advance,
cramer

Could not retrieve Enterprise Global Template - Load balancer issue

Hi,
We have 4 Project Server 2010 servers. The 4 web servers are load balanced by networking team with sticky session configured.
When we try to connect to the Project Server using MPP 2007 SP2, it fails saying 'Could not retrieve Enterprise Global template'. It works perfect when we point to a specific server by specifying the IP address for server name in the 'hosts'
file.
Earlier we observed some errors in the event viewer related to the SharePoint's internal load balancer for which restarted the 'Project Server Application' on each web server and it got fixed.
Now, the only entries that we see related to load balancer are as mentioned below as Information (not errors).
SharePoint Web Services Round Robin Service Load Balancer Event: Initialization
Process Name: w3wp
Process ID: 15080
AppDomain Name: /LM/W3SVC/539065287/ROOT-1-130462463500778047
AppDomain ID: 2
Service Application Uri: urn:schemas-microsoft-com:sharepoint:service:ae7c7ee5c09b4e8198bdbb1ecb8c1c1b#authority=urn:uuid:9f626d347784423eb14bde4a1f4d13fc&authority=https://lonms12546:32844/Topology/topology.svc
Active Endpoints: 4
Failed Endpoints:0
Endpoint List:
http://lonxxx2532:32843/ae7c7ee5c09b4e8198bdbb1ecb8c1c1b/PSI
http://lonxxx2545:32843/ae7c7ee5c09b4e8198bdbb1ecb8c1c1b/PSI
http://lonxxx2546:32843/ae7c7ee5c09b4e8198bdbb1ecb8c1c1b/PSI
http://lonxxx2566:32843/ae7c7ee5c09b4e8198bdbb1ecb8c1c1b/PSI
Could the issue be due to network load balancer?
Could the issue be due to Sticky session configuration on the load balancer.?
How can we get to the root cause of the issue?
Which logging category should we set to 'Verbose' that can give us some hint.
Update: We tried to capture the requests through fiddler and observed that when fiddler is running on the client computer then the connection works perfectly fine even through the load balancer. Probably fiddler is reformatting the SOAP
envelop of the web service requests the way it should before sending the request to the server.
If we do not run fiddler and run some other similar tool (like Charles) then it again gives the issue and the request stucks at /PWA/_vti_bin/psi/winproj.asmx
We ran Wireshark on the servers and found the following for that web service call:
[TCP Previous segment not captured] Continuation or non-HTTP traffic.
Please let me know if someone could provide any hint what can be done next.
Regards, Amit Gupta

There are several ways to configure your load balancer. I would suggest that you work with the network engineer, the load balancer vendor and your project administrator to resolve this issue.
Basically you need URL to be resolved correctly. Also, I don't believe PS2007 did a good job handling load balancing, so you may need to bring someone in good with IIS and see they can tweek IIS to manage the cache better.
As I go back and look at your analysis, I think you should probably look at upgrading to Project Server 2013. They made some improvement in load balancing and the management of distributive cache.
I assume you have 4 WFE because you have thousands of project users. Roughly how many you have? Over 1000, over 5000
Have you tried to see if using two load balancing work? How about just one front end. I often see companies scaling SharePoint and Project server to extremes.
Michael Wharton, MVP, MBA, PMP, MCT, MCTS, MCSD, MCSE+I, MCDBA
Website http://www.WhartonComputer.com
Blog http://MyProjectExpert.com contains my field notes and SQL queries

Cisco ACE20 Load balancing issues

Dear All,
I have a problem with the ACE 20 load balance
To start with following is our architectural request flow:
Load Balancer --> Webseal /(reverse proxy) --> HTTP Server --> Portal Server
We have Hardware Load Balancer Cisco ACE20.
When we access our portal from Webseal server it works totally fine without any issue, but when we access the same application using ACE we face the following issues:
1) Some of the links on do not work. For eg: We have a link "subscribe" which points to https://intranet/abc/wps/portal/subscription , whenever we click on this link, the request is directed to https://intranet/abc/wps/portal i.e homepage
2) URL redirection does not work We have some links which have a url forwarding or redirection for example when we open https://intranet/ef/quickplace it forwards the requests to https://intranet/ef/quickplace/Main.nsf?opendocument....., but this redirection fails and again the request is thrown to homepage i.e https://intranet/abc/wps/portal
3) The response of the request and the overall portal when accessed via ACE is very sluggish and it takes 20 seconds for homepage to load, whereas the homepage loads in 4 secs when accessed via webseal.
below is the ACE details. Kindly provide the your inputs to resolve this issue. will rate all the suggestions
Hardware Product Number: ACE20-MOD-K9
Card Index:     207
Hardware Rev:   2.3
Feature Bits:   0000 0002
Slot No. :      7
Type:           ACE
Software
loader:    Version 12.2[120]
system:    Version A2(1.4) [build 3.0(0)A2(1.4) adbuild_11:54:12-2009/03/05_/a
uto/adbu-rel2/rel_a2_1_4_throttle/REL_3_0_0_A2_1_4]
system image file: [LCP] disk0:c6ace-t1k9-mz.A2_1_4.bin
installed license: ACE-SEC-LIC-K9

Dear all,
Please suggest on this issue.
BS

CSS load balancing issue

Hi,
I'm facing a problem with CSS while load balaning for the web application with two servers.
The application is based on activex..
Basically I have two servers running web application for which I have created VIP in the CSS, user hits the VIP address and they access the application, also we use the sticky thing as the application requires the session persistence.. everything is fine, but the problem starts when one of the server fails...
Assume a user hits the VIP address and access the application, due to the sticky thing his session will be with server A (for eg.), now suddenly the server A fails and in that time the user was doing a transcation and inputting some data and after that he press the submit button on the page, as the server A is down the web page gets refreshed and he has to relogin to the application and redo the whole thing what he was doing in that particular transcation...
Now the application guys are telling this problem should not happen as the CSS should be able to take care of the session getting reestablished to the other server B during the server A failure...
Can someone through some lights on this... I'm bit confused now... as what I understand is that the webpage gets refreshed during a server failure because the tcp session id will get changed and the server B will not accept the same tcp session so it reinitiates the new session...
Is my understanding right?? or is there something which we can do on the CSS to avoid this problem...
Regards
Vijay.

Hi Gilles,
Thanks for the clarification.
I have two more issues too...
1. The load balancing of the application between the two servers are not even. Actually the traffic from the users keep hitting only one server, I understand the point of sticky method used in our case, but even atleast the connection from another client machine should go to the other server,but it is not the case... traffic from all the clients goes to only one server..
what could be the possible reason for the same...
My config is as below...
service SERVER-1
port 80
protocol tcp
keepalive port 80
keepalive type tcp
redundant-index 4
ip address 10.6.223.87
active
service SERVER-2
port 80
protocol tcp
keepalive port 80
keepalive type tcp
ip address 10.6.223.77
redundant-index 5
active
owner WEB
content WEB
add service SERVER-1
add service SERVER-2
redundant-index 104
vip address 10.6.223.78
protocol tcp
port 80
url "/webretrieve*"
advanced-balance sticky-srcip
active
2. Slow response of the application when users access application through VIP address(CSS), what can be done further in the configuration to improve the performance?? or any thing else I can do...
Regards

Load balancing issue?

Hi,
The problem what i am facing is load balancing is not happening through application server.when i am connecting through sqlplus client as same user for more than twice it is sharing the nodes in a proper way,but when i am connecting through application server it is redirecting only to the master node not to the another node.and it's a two node rac
Inforamation:
1.The application is connected through ODBC driver.
2.And the tns entry what i given as follows
INT =
(DESCRIPTION =
(LOAD_BALANCE = ON)
(ADDRESS= (PROTOCOL = TCP)(HOST = scan.real.co.in)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = INT)
INT1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = scan.real.co.in)(PORT = 1521))
(CONNECT_DATA =
(SERVER = dedicated)
(SERVICE_NAME = INT)
(INSTANCE_NAME = INT1)
INT2 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = scan.real.co.in)(PORT = 1521))
(CONNECT_DATA =
(SERVER = dedicated)
(SERVICE_NAME = INT)
(INSTANCE_NAME = INT2)
3.Instead of scan ip i have tried with vip also but there is no proper response.
Thanks in advance
dbastream

Hi,
This is my listener configuration
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))) # line added by Agent
LISTENER_SCAN3=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN3)))) # line added by Agent
LISTENER_SCAN2=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN2)))) # line added by Agent
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))) # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN2=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN3=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON # line added by Agent
Thanks in advance
dbastream

Oracle RAC load balancing sessions

Hi Gurus,
I have just implemented SAP on a 2 node RAC. We had RAC1 shutdown for maintenance, and all sessions were failed over to RAC2. Upon bringing RAC1 up, all the sessions remains connected to RAC2. New sessions are load balance between the 2 nodes. Hence, RAC2 is much busier than RAC1.
How can I distribute the sessions/load in oracle upon bringing back a RAC node?
Thanks,
Tzyy Ming

Hi,
>> I am using 11g scan. I have switched all the scan services to RAC1. RAC2 has over 300 sessions. After the entire afternoon, RAC1 only manage to build up less than 100 sessions, while RAC2 still has 300 sessions. Most users are connected to SAP throughout the day. It will be nice if we can average out to 200 sessions on each node.
You shoudn't expect that a SAP workprocess kills itself and connect to another resource during the runtime, in order to RAC1. So, newly created processes may be connected to the newly startup RAC node. Because of this RAC2 has 300 and RAC1 has 100 sessions on it.
>> Relocating the service manually requires human intervention and creates human error. How can we configure RAC so that it knows 1 node is busier than the others and automatically redirect the connection to the lighter node?
As far as I know that this is manual operation, not automatic
I hope that it is clear
Best regards,
Orkun Gedik

RAC Load Balancing Issue

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