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The restrictions settings prevent inappropriate conduct of clients. In the first line of Listing 9-14, you can see what exactly is considered inappropriate. In this line, first the default settings for accessing the server are allowed. Then three types of packets are disallowed using noquery, notrust, and nomodify. These make sure that no contact whatsoever is allowed for NTP clients. Then an exception to these settings is created for the local NTP service and all computers in the network 192.168.0.0. Add a restrictions line like the one in Listing 9-14 for every IP address or range of IP addresses that has to be allowed to use the NTP server this way.

There are two methods to start services. First, you can fire up the service when your system boots, in which case the service occupies its port and waits for incoming connections all the time. But, if the service is needed only occasionally, starting it at system boot and keeping it available all the time is a waste of system resources. This is exactly when the second method is preferred: the xinetd process (and its predecessor inetd) were developed to listen on behalf of other processes to see if a connection comes in. If it does, xinetd starts the process, thus making optimal use of system resources. In this section you ll learn how to configure it.

In the section Using Functions in the WHERE and ORDER BY Clauses, you learned that functions can be used in the WHERE clause to filter out unneeded rows. Although I am not saying that you should never include a function in the WHERE clause, you need to realize that including a function that operates on a column may cause a decrease in performance. The Sales.SalesOrderHeader table does not contain an index on the OrderDate column. Run the following code to create an index on the column. Don t worry about trying to understand the code at this point. USE [AdventureWorks2008] GO --Add an index IF EXISTS (SELECT * FROM sys.indexes WHERE object_id = OBJECT_ID(N'[Sales].[SalesOrderHeader]') AND name = N'DEMO_SalesOrderHeader_OrderDate') DROP INDEX [DEMO_SalesOrderHeader_OrderDate] ON [Sales].[SalesOrderHeader] WITH ( ONLINE = OFF ); GO CREATE NONCLUSTERED INDEX [DEMO_SalesOrderHeader_OrderDate] ON [Sales].[SalesOrderHeader] ([OrderDate] ASC); Toggle on the Include Actual Execution Plan setting before typing and executing the code in Listing 3-29. Listing 3-29. Compare the Performance When Using a Function in the WHERE Clause USE AdventureWorks2008; GO --1 SELECT SalesOrderID, OrderDate FROM Sales.SalesOrderHeader WHERE OrderDate >= '2001-01-01 00:00:00' AND OrderDate <= '2002-01-01 00:00:00';

<bean name="hessianUserAccountService" class="com.apress.timesheets.hessian.HessianUserAccountServiceImpl"> <property name="userAccountService" ref="userAccountService"/> </bean> <bean name="/userAccountService" class="org.springframework.remoting.caucho.HessianServiceExporter"> <property name="service" ref="hessianUserAccountService" /> <property name="serviceInterface" value="com.apress.timesheets.hessian.HessianUserAccountService"/> </bean> Listing 9-13 also shows the configuration of the exporter. This Spring wrapper for the Hessian server component is near identical to the corresponding exporter for Spring s HTTP invoker mechanism. The pathname is defined by the bean name. The exporter passes incoming requests to a specified service bean that must implement the specified service interface. The only significant difference in configuration is our use of a service wrapper and corresponding interface to avoid the conflict with Hibernate lazy loading.

Note On Ubuntu Server, xinetd is not installed by default. Instead, the legacy inetd service is available. Because xinetd offers the same capabilities but with much more flexibility, I m covering just xinetd in this section. Make sure that you have it installed by using apt-get install xinetd.