JDBC Failover in Oracle 8i

Hi there,
we have an existing JDBC applications connecting to one database (doing retrieve data, update data) and now looking to implement a failover, since this database is often down, either due to network issue or CPU panic.
Can anyone point me on how the best way to go about doing this?
It seems to me that 1) I have to first have the Oracle instances configured for this, and 2) then do the modifications on the JDBC code level.
Any help would be greatly appreciated! Thank you for your help.
Cheers,
Kevin

HI Kevin,
Configuring failover is pretty simple, there are 2 basic ways to config failover,
1) By re-directing the requests to a stand-by database :
if you have a stand-by database, then the tnsnames entry can be configured in such a way that when the primary instance fails, the requests will automatically be routed to the stand-by db.
[ no code change required ]
2) By handling failover using call-back methods : In this case, Callback methods can be registered with the database connection, when the database goes down, the callback methods will be notified and you can alert the user that the database is down. And when the database comes up, the callback methods will be called again and notified that the db is up and you can continue processing.
[ Callback methods have to be implemented ]
To learn more about basic failover refer to Transparent Application Failover(TAF) sample @ http://otn.oracle.com/sample_code/tech/java/sqlj_jdbc/files/9i_jdbc/content.html#ocitrans
[ certified on Solaris and Linux ]
refer to the Net Services Admin Guide for more info on configuring TAF
TAF is available only with Oracle9i OCI JDBC driver, you have to use 9i drivers to connect to the 8i DB.
Regards
Elango.

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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="var"
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from this code:
package Business;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
* @author jeffreak
* To change this generated comment edit the template variable "typecomment":
* Window>Preferences>Java>Templates.
* To enable and disable the creation of type comments go to
* Window>Preferences>Java>Code Generation.
public class beanDbConnect {
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If you're running a Web app, put all JARs that your app needs in the WEB-INF/lib directory. That's always in the CLASSPATH.
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{code}
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by greg freda ([email protected]):
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Hi Experts
I browed the forum and could not find a strait answer to my problem. Hence I am posting this thread.
I have a sync call using JDBC Receiver to ORACLE stored procedure.
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t edi_extract%rowtype;
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Regards
Effi.

>
Rajesh wrote:
> > Hi Rajesh
> >
> > The structure of my data type for the request query is as follows:
> >
> >
DT_EDIExtractSelectionRequest (Complex Type)
> >    STATEMENT (Element)
> >       PROC_NAME (Element)
> >          ACTION (Attribute) _mapped to_: EXECUTE
> >          TABLE (Element) _mapped to_: TW.XI_TEST
> >          EDI_EXTRACT_ID (Element) _mapped to_: 123456
> >             isInput (Attribute) _mapped to_: true
> >             type (Attribute) _mapped to_: STRING
> >          EDI_EXTRACT (Element)
> >             isOutput (Attribute) _mapped to_: true
> >             type (Attribute) _mapped to_: CURSOR
> >
> >
>
>
> Change the DT type to like below
>
>            STATEMENT (Element)
>                   ACTION (Attribute) _mapped to_: EXECUTE
>                   TABLE (Element) _mapped to_: TW.XI_TEST
>                   EDI_EXTRACT_ID (Element) _mapped to_: 123456
>                        isInput (Attribute) _mapped to_: true
>                        type (Attribute) _mapped to_: STRING
>                   EDI_ETRACT (Element)
>                      isOutput (Attribute) _mapped to_: true
>                     type (Attribute) _mapped to_: CURSOR
>
> and try ...actually i dont remeber the exact strucuture..but i tolo faced the same pain of this
>
> HTH
> Rajesh
Hi Rajesh
Changing the DT per your suggestion result in the following error:
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Omitting the PROC_NAME element from the DT is not correct.
Also, I would also like to clarify that the variables of the DT I am using are:
EDI_EXTRACT_ID is defined as string
EDI_EXTRACT is defined as string
Because the variable p_res is mapped to nothing in the request payload it does not show.
I read in one of the posts that this is correct and the variable is used due to the fact the isOutput attribute is true.
Regards,
Effi.
Edited by: Effi Olivkovitch on Dec 6, 2009 9:11 AM
Edited by: Effi Olivkovitch on Dec 6, 2009 9:18 AM

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I've successfully accessed a MySQL database via a
DataSource from a servlet (that uses a DAO). However,
when I try to do the same with an Oracle 10g
Database, I get the error message:
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That's different from a ClassNotFoundException.
>
I'm using J2SE1.5.0/5.0 and ojdbc14.jar, the latter
of which I downloaded this afternoon as the latest
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Upon examining the ReadMe file at the top of the
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Choose Create New Driver or DataSource on the toolbar
Specify an arbitrary name for your driver entry such as OracleDriver and click OK
Now search for the Oracle JDBC Driver JAR file on your local harddisk.
I restarted the Java instance with SMICM after completing this task Java will not start. Is there anyway to roll back that change to get Java back up and running?
Also is there a better way to go about making this oracle connection?
Best Regards,
Edited by: Troy Loseke on Feb 20, 2008 8:30 AM

Hi,
although [this guide|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/92d80512-0a01-0010-32a3-cd3735bd9275] is for Visual Composer I find it very helpful in setting up JDBC connections to databases. There is a very deltailed section about setting up a system to a MS SQL Server and the relevant data if you want to connect to Oracle:
4.2 BI JDBC Connector to Oracle
Located at:
http://www.oracle.com/technology/software/tech/java/sqlj_jdbc/index.html
Driver: oracle.jdbc.driver.OracleDriver
URL: jdbc:oracle:<drivertype>:@<database>
jdbc:oracle:thin:@myhost:1521:orcl
Hope this helps,
Holger.

SAP Portal JDBC Connector for Oracle

Hi forum:
hi need to configure the DATABASE URL for make the connection with JDBC Connector to Oracle.
Somebody knows this url ?
thnks
Joshua

HI,
DB URL for oracle
jdbc:sap:sapdb://localhost/TST?timeout=0
For DB configuration refer this link
<a href="http://help.sap.com/saphelp_47x200/helpdata/en/c0/3ad4d5cdc66447a188b582aad537d3/frameset.htm">DB CONFIGURATION</a>

JDBC access to Oracle DB - nls_charset-12.jar

All,
I found this jar used by an application along with the oracle 9.x JDBC driver. Obviously an upgrade is required to the latest JDBC drivers. Does anyone know what nls_charset-12.jar is used for and if the new 11g version still requires it? I would assume there is only 1 jar file which would take care of JDBC communication with Oracle DB.
Thanks in advance!

>
Yes, I will have to support international characters as well. So this jar file is still required with Oracle 11g?
>
That file has been replaced with orai18n.jar which is clearly stated on the download page:
http://www.oracle.com/technetwork/database/enterprise-edition/jdbc-112010-090769.html
The driver's readme also clearly explains for which character sets you need the ora18n.jar:
http://download.oracle.com/auth/otn/utilities_drivers/jdbc/112/Readme.txt?e=1302938175&h=f74ccdcb22412e9b88109cc11fc17b32
>
The JDBC Server-side Internal Driver provides complete NLS support.
It does not require any NLS extension jar file. Discussions in this
section only apply to the Oracle JDBC Thin and JDBC OCI drivers.
The basic jar files (ojdbc5.jar and ojdbc6.jar) contain all the
necessary classes to provide complete NLS support for:
- Oracle Character sets for CHAR/VARCHAR/LONGVARCHAR/CLOB type data
that is not retrieved or inserted as a data member of an Oracle
Object or Collection type.
- NLS support for CHAR/VARCHAR data members of Objects and
Collections for a few commonly used character sets. These
character sets are: US7ASCII, WE8DEC, WE8ISO8859P1, WE8MSWIN1252,
and UTF8.

JDBC Failover in Oracle 8i

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