Why intermittently fuse taking 8+ seconds to get a connection from db ?

Issue

• We are facing issue with pooled connection from datasource. We have been having a lot of lag with getting pooled connections from datasource. Appdynamics shows that its taking 8+ seconds to get a connection from db. This is intermittent in nature. Below is the db connection code we use. Any ideas to fix this :

       <service interface="javax.sql.DataSource">
        <service-properties>
            <entry key="osgi.jndi.service.name" value="jdbc/TestDataSource" />
        </service-properties>
        <bean class="com.ibm.db2.jcc.DB2DataSource">
            <property name="serverName" value="${db.server.host}" />
            <property name="portNumber" value="${db.server.port}" />
            <property name="databaseName" value="${db.server.dbName}" />
            <property name="currentSchema" value="${db.server.schema}" />
            <property name="user" value="${db.server.user}" />
            <property name="password" value="${db.server.password}" />
            <property name="driverType" value="${db.server.drivertype}" />
            <property name="dataSourceName" value="${db.server.dataSource.name}" />
        </bean>
    </service>