Discoverer 10g : here a bit of technical work, though i havn’t tried it actually, but got it from one of good expert of Discoverer , that’s why i sharing it.
How To Change The Session Timeout For Discoverer 10g(10.1.2)?
Steps to change the Discoverer Session timeout:
1. Edit the file $ORACLE_HOME/discoverer/util/pref.txt.
2. Under the heading [Session Manager] there is a parameter called timeout.
Timeout = 1800 (Number of Seconds before timeout)
3. Save the pref.txt file.
4. Run the applypreferences script.
1. Edit the following file:
$ORACLE_HOME/j2ee/OC4J_BI_Forms/applications/discoverer/discoverer/WEB-INF/web.xml
2. Add the following entry to the file:
<session-config>
<!– Session timeout in minutes –>
<session-timeout>60 </session-config> The file should look something like:
<web-app>
<servlet>
<servlet-name>…</servlet-name>
<servlet-class>…</servlet-class>
</servlet>
<session-config>
<session-timeout>60</session-timeout>
</session-config>
</web-app> 3. Save the web.xml file.
4. Run command ’dcmctl updateConfig -ct oc4j -v’ to update the configuration.
5. Restart OC4J with command ’dcmctl restart -ct oc4j - v'.



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