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See Also For more information on how to use System Monitor and the Performance console, see 12, Maintaining a Network Infrastructure.

Sometimes code degenerates under maintenance, and sometimes the code just wasn t very good in the first place. In either case, here are some warning signs sometimes called smells (Fowler 1999) that indicate where refactorings are needed.

The DNS performance object in System Monitor includes 62 counters. You can use these counters to measure and monitor various aspects of server activity, such as the following:

including the following features:

Overall DNS server performance statistics, such as the number of overall queries and responses processed by a DNS server UDP or TCP counters, for measuring DNS queries and responses that are pro cessed using either of these transport protocols Dynamic update and secure dynamic update counters, for measuring registration and update activity generated by dynamic clients Memory usage counters, for measuring system memory use and memory alloca tion patterns created by operating the server computer as a DNS server running Windows Server 2003 Recursive lookup counters, for measuring queries and responses when the DNS Server service uses recursion to look up and fully resolve DNS names on behalf of requesting clients

Code is duplicated Duplicated code almost always represents a failure to fully factor the design in the first place. Duplicate code sets you up to make parallel modifications

6-26

6

Multicast announcements Simple password authentication Support for subnetted and Classless InterDomain Routing (CIDR)

whenever you have to make changes in one place, you have to make parallel changes in another place. It also violates what Andrew Hunt and Dave Thomas refer to as the DRY principle Don t Repeat Yourself (2000). I think David Parnas said it best: Copy and Paste is a design error (McConnell 1998b).

Windows Internet Name Service (WINS) lookup counters, for measuring queries and responses made to WINS servers when the WINS lookup integration features of the DNS Server service are used Zone transfer counters, including specific counters for measuring the following: all zone transfer (AXFR), incremental zone transfer (IXFR), and DNS zone update notification activity

Most performance counters in System Monitor are used only rarely. Despite this, there is a running joke among network administrators that System Monitor is the most essential of all administrative tools. This is because, when left running with its realtime graphs prominently displayed for all to see, it never fails to give your boss the impres sion that you are busy at work.

A routine is too long In object-oriented programming, routines longer than a screen are rarely needed, and usually represent the attempt to force-fit a structured programming foot into an object-oriented shoe.

Table 6-2 presents some of the most useful DNS performance counters. These counters allow you to determine how often a specified DNS server is queried and how often errors are generated.

environments The Windows 2000 and Windows Server 2003 Routing And Remote Access implementation of both versions of RIP have the following features:

One of my clients was assigned the task of breaking up a legacy system s longest routine, which was more than 12,000 lines long. With effort, he was able to reduce the size of the largest routine to only about 4,000 lines. One way to improve a system is to increase its modularity increase the number of well-defined, well-named routines that do one thing and do it well. When changes lead you to revisit a section of code, take the opportunity to check the modularity of the routines in that section. If a routine would be cleaner if part of it were made into a separate routine, create a separate routine.

Table 6-2