<datasource jndi-name="java:/MySqlDS" pool-name="MySqlDS" enabled="true" use-java-context="true">
                    <connection-url>
                        jdbc:mysql://localhost:3306/EJB3
                    </connection-url>
                    <driver-class>
                        com.mysql.jdbc.Driver
                    </driver-class>
                    <driver>
                        com.mysql.jdbc.Driver#5.1
                    </driver>
                    <transaction-isolation>
                        TRANSACTION_READ_COMMITTED
                    </transaction-isolation>
                    <pool>
                        <min-pool-size>
                            200
                        </min-pool-size>
                        <max-pool-size>
                            300
                        </max-pool-size>
                        <prefill>
                            true
                        </prefill>
                        <use-strict-min>
                            false
                        </use-strict-min>
                    </pool>
                    <security>
                        <user-name>
                            test
                        </user-name>
                        <password>
                            test
                        </password>
                   </security>
                    <validation>
                        <validate-on-match>
                            false
                        </validate-on-match>
                        <background-validation>
                            false
                        </background-validation>
                        <useFastFail>
                            false
                        </useFastFail>
                    </validation>
                    <statement>
                        <prepared-statement-cache-size>
                           100
                        </prepared-statement-cache-size>
                        <share-prepared-statements/>
                   </statement>
                </datasource>
                <datasource jndi-name="java:/h2test" pool-name="h2test" enabled="true" use-java-context="true">
                    <connection-url>
                        jdbc:h2:mem:test;DB_CLOSE_DELAY=-1
                    </connection-url>
                    <driver-class>
                        org.h2.Driver
                    </driver-class>
                    <module>
                        org.h2.Driver#1.2
                    </module>
                    <pool>
                        <prefill>
                            true
                        </prefill>
                        <use-strict-min>
                            false
                        </use-strict-min>
                    </pool>
                    <security>
                        <user-name>
                            sa
                        </user-name>
                        <password>
                            sa
                        </password>
                    </security>
                    <validation>
                        <validate-on-match>
                            false
                        </validate-on-match>
                        <background-validation>
                            false
                        </background-validation>
                        <useFastFail>
                            false
                        </useFastFail>
                    </validation>
                    <statement/>
                </datasource>