Do client connections need to be sticky to Plug-in web server instance?
Hi,
I'm trying to understand requirements for load-balancing client requests to a
group of web servers on which we will have the NSAPI plug-in installed under iPlanet.
We will have in-memory replication configured in a cluster of weblogic 5.1 servers
behind the web servers.
Do we need to ensure HTTP stickiness from browser to the web servers or can client
requests be sent to any web server containing the plug-in during a session?
Thanks in advance,
Julian
They can be sent to any of the webservers as long as the webservers are
configured the same. They should be set to proxy to the same weblogic
instances.
Regards,
Eric
"Julian Herzel" <[email protected]> wrote in message
news:3e62a1b1$[email protected]..
>
Hi,
I'm trying to understand requirements for load-balancing client requeststo a
group of web servers on which we will have the NSAPI plug-in installedunder iPlanet.
We will have in-memory replication configured in a cluster of weblogic 5.1servers
behind the web servers.
Do we need to ensure HTTP stickiness from browser to the web servers orcan client
requests be sent to any web server containing the plug-in during asession?
>
Thanks in advance,
Julian
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TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Production on 25-SEP-2009 01:23:49
Copyright (c) 1991, 2005, Oracle. All rights reserved.
System parameter file is C:\oracle\product\10.2.0\db_2\network\admin\listener.ora
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Trace information written to C:\oracle\product\10.2.0\db_2\network\trace\listener_bkp_1.trc
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TIMESTAMP * CONNECT DATA [* PROTOCOL INFO] * EVENT [* SID] * RETURN CODE
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TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
32-bit Windows Error: 2: No such file or directory
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LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 25-SEP-2009 01:33:40
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=WINXP)(PORT=1523)))
Services Summary...
Service "FINANCEIRA.WINXP" has 1 instance(s).
Instance "FINANCEI", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:1
LOCAL SERVER
The command completed successfully
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SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = FINANCEIRA.WINXP)
(SID_NAME = FINANCEI)
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = WINXP)(PORT = 1521))
SID_LIST_LISTENER_BKP_1 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = FINANCEIRA.WINXP)
(SID_NAME = FINANCEI)
LISTENER_BKP_1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = WINXP)(PORT = 1523))
h2. v$resource_limit
RESOURCE_NAME ; CURRENT_UTILIZATION ; MAX_UTILIZATION ; INITIAL_ALLOCATION ; LIMIT_VALUE
processes ; 26 ; 30 ; 150; 150
sessions ; 30 ; 35 ; 170 ; 170
2 rows selected
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another important information is that connecting by the default listener LISTENER instead of the LISTENER_BKP_1 listener, the connection is completed successfully. There's enough SGA memory space too.
Tks,Paulo_BR wrote:
i have a problem here with the connection between a client host and a server database, using a new non-default listener LISTENER_BKP_1. The error showed is:
ORA-12518: TNS:listener could not hand off client connectionDon't do Oracle on Windows, so I'm not sure how the following relates to the Listener dealing with a dedicated server connection request on Linux/Unix.
On Linux/Unix, a dedicated server request means just that - a dedicated process has to be started to service that client. The Listener does it by using the parameters of the configured listener.ora service to execute +$ORACLE_HOME/bin/oracle+. This process then starts up, and the Listener hands off the client connection for this process for servicing.
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And this relates to the underlying error you are seeing:
TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
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while trying to select from dblink I got ORA-12518: TNS:listener could not hand off client connection
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here is the listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\product\10.2.0\db_2)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = disater)(PORT = 1521))
)What is the operating system and database version for remote and local machines.
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12518, 00000, "TNS:listener could not hand off client connection"
// *Cause: The process of handing off a client connection to another process
// failed.
// *Action: Turn on listener tracing and re-execute the operation. Verify
// that the listener and database instance are properly configured for
// direct handoff. If problem persists, call Oracle Support.
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I'm confused how client connect to RAC,
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http://www.datadirect.com/developer/odbc/odbc_oracle_rac/connecting/index.ssp
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Thank you!Very good question.
You have asked in a certain way which tells me you have done lot of research.
Any how:-
Remember no matter how convoluting it looks it is the same.
1 Tns Entry
If you add a node then yes you have to publish it.
There are other alternatives such as Oracle Names [old]
internect directory , ldap and so on, beyond the scope of this discussion.
1)
TNSNAME Entry
RAC.WORLD=
DESCRIPTION=DESCRIPTION=(LOAD_BALANCE=on)
(ADDRESS=(PROTOCOL=TCP)(HOST=host1) (PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=host2) (PORT=1521))
(CONNECT_DATA=(SERVICE_NAME=service))
Now see The same string from DESCRIPTION onwards goes to jdb thin client, it
is the same thing...
Also the host1 host2 are all VIPS'
Also you need failover , load balance thingies in there
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non vip, Test it out, tns should hop over it .
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ViewObject mgrVO = am.findViewObject("Managers");
// We're done with the AM instance, so release it
Configuration.releaseRootApplicationModule(am,true);
Is it for testing only or really useful for the production environment? Am I doing the right thing if i use such method to establish my web client connection? What's the pros and cons for using this method? Any other better alternatives?
Question 2: As I know BC4J automatically takes care of connection pooling as a default manner since version 3.2. Can I still use the following statement
session.setAttribute("user_name", user_name); //Set session attribute
String user_name = (String) session.getAttribute(user_name); // Get session attribute
to capture and assign client session correctly for individual clients?
Question 3: What codes should I use to achieve 'Transaction' update, which assembles the coding as follows:
Connection.setAutoCommit(false); //disable auto commit
connection.commit();
connection.rollback();
connection.close();
Thanks for answering!!!Question 1: Through the examples I search in my JDeveloper (Candidate 2) directory, found a file TestClient.java in the \BC4J\samples\Caching\src\demo directory with the following codes:
// Create an instance of the application module by name, using local mode
String _am = "demo.DemoModule"; // Fully-qualified application module name
String _cf = "DemoModuleLocal"; // Configuration name for connection info
ApplicationModule am = Configuration.createRootApplicationModule(_am,_cf);
// Find the Managers view object by name in the application module
ViewObject mgrVO = am.findViewObject("Managers");
// We're done with the AM instance, so release it
Configuration.releaseRootApplicationModule(am,true);
Is it for testing only or really useful for the production environment? Am I doing the right thing if i use such method to establish my web client connection? What's the pros and cons for using this method? Any other better alternatives?The Configuration API (createRootApplicationModule, releaseRootApplicationModule) will work. However, please note
that it is intended for java clients that will hold an ApplicationModule reference for a long duration. The BC4J web
frameworks (represented, for example, by the ApplicationModule and ReleasePageResources tags) all use the
SessionCookie interface to acquire/release ApplicationModule instances on a per request basis. This will allow
better scalability. Please see the pooling sample / documentation / javadoc for more information about using these
APIs. The pooling sample servlet is located in \BC4J\samples\Pooling\src\demo\TestPoolServlet.
Question 2: As I know BC4J automatically takes care of connection pooling as a default manner since version 3.2. Can I still use the following statement
session.setAttribute("user_name", user_name); //Set session attribute
String user_name = (String) session.getAttribute(user_name); // Get session attribute
to capture and assign client session correctly for individual clients?BC4J will not interfere with your use of the HttpSession context. How do you intend the "user_name" to be used? Do
you intend it to represent the DB user, JAAS user, etc. If you intend it to be used as the DB user you will need to declare
the "user_name" to BC4J. Please see:
http://technet.oracle.com/products/jdev/howtos/bc4j/howto_dynamic_jdbc.html
Question 3: What codes should I use to achieve 'Transaction' update, which assembles the coding as follows:
Connection.setAutoCommit(false); //disable auto commit
connection.commit();
connection.rollback();
connection.close();ApplicationModule.getTransaction().commit();
ApplicationModule.getTransaction().rollback();
If you are using the Configuration or SessionCookie APIs, as mentioned above, then the connection lifecycle will be
managed for you. So, you should not need to invoke connection.close().
Thanks for answering!!!
Hope this helps.
JR -
I have a client application in c++ which interacts with sql server database. My question is whether I need to make any changes to the client application code to allow it to have the benefits of running on a SQL server 2012 cluster environment.
To elaborate more on my query my concern is for e.g if my application has called an api to execute a sql query and during
the execution of this query the sql server (part of the cluster) goes down then as per my understanding the sql cluster would ensure that another node takes up the task from the current sql server which has gone down. Is this transition transparent to the
client application or in such a case my client application needs to again make a new connection and again execute the query?Hello,
Just as Shanky post above, When you connected to a database in an availability group and specify the availability group listener in the connection string, if the availability group fails over, the original connection is broken, your application
should try a new connection after the failover.
So, when connect to an availability group, please try to increasing connection timeout and implementing connection retry logic to increase the probability of successful connection.
Reference:SqlClient Support for High Availability, Disaster Recovery
Regards,
Fanny Liu
If you have any feedback on our support, please click here.
Fanny Liu
TechNet Community Support
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