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<datasource>
     <name>WSO2_CARBON_DB</name>
     <description>The datasource used for registry and user manager</description>
     <jndiConfig>
           <name>jdbc/WSO2CarbonDB</name>
     </jndiConfig>
     <definition type="RDBMS">
           <configuration>
               <url>jdbc:oracle:thin:@SERVER_NAME:PORT/DB_NAME</url>
               <username>regadmin</userName>
               <password>regadmin</password>
               <driverClassName>oracle.jdbc.driver.OracleDriver</driverClassName>
               <maxActive>80</maxActive>
               <maxWait>60000</maxWait>
               <minIdle>5</minIdle>
               <testOnBorrow>true</testOnBorrow>
               <validationQuery>SELECT 1 1<FROM DUAL</validationQuery>
               <validationInterval>30000</validationInterval>
           </configuration>
     </definition>
</datasource>

When using the ojdbc6.jar with WSO2 servers there is a possibility of throwing an timezone region not found error. To overcome this issue it is necessary to set the java property as export JAVA_OPTS="-Duser.timezone='+05:30'". The value of this property should be the GMT difference of the country.  

if it is necessary to set this property permanently, then it should be defined inside the wso2server.sh as a new JAVA_OPT property.