For MySQL

<component> 

   <key>org.exoplatform.services.database.HibernateService</key>

   <jmx-name>database:type=HibernateService</jmx-name>

   <type>org.exoplatform.services.database.impl.HibernateServiceImpl</type>

   <init-params>

      <properties-param>

         <name>hibernate.properties</name>

         <description>Default Hibernate Service</description>

         <property name="hibernate.show_sql" value="false"/>

         <property name="hibernate.cglib.use_reflection_optimizer" value="true"/>

         <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/exodb?relaxAutoCommit=true&amp;amp;autoReconnect=true&amp;amp;useUnicode=true&amp;amp;characterEncoding=utf8"/>

         <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>

         <property name="hibernate.connection.autocommit" value="true"/>

         <property name="hibernate.connection.username" value="exo"/>

         <property name="hibernate.connection.password" value="exo"/>

         <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>

         <property name="hibernate.c3p0.min_size" value="5"/>

         <property name="hibernate.c3p0.max_size" value="20"/>

         <property name="hibernate.c3p0.timeout" value="1800"/>

         <property name="hibernate.c3p0.max_statements" value="50"/>

       </properties-param>

   </init-params>

</component>