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Pure Reactances Pure inductive reactances (X L ) and capacitive reactances (X C ) simply add together when coils and capacitors are in series Thus, X = X L + X C In the RX plane, their vectors add, but because these vectors point in exactly opposite directions inductive reactance upward and capacitive reactance downward (Fig 16-1) the resultant sum vector inevitably points either straight up or straight down, unless the reactances are equal and opposite, in which case they cancel and the result is the zero vector Problem 16-1 Suppose a coil and capacitor are connected in series, with jX L = j200 and jX C = j150 What is the net reactance Just add the values: jX = jX L + jX C = j200 + ( j150) = j(200 150) = j50 This is a pure inductive reactance, because it is positive imaginary Problem 16-2 Suppose a coil and capacitor are connected in series, with jXL = j30 and jX C = j110 What is the net reactance

Before closing out this chapter, I d like to include a few tips about closing a connection. As discussed earlier, when connection pooling is enabled and the Connection.Close method is executed, the Connection is released back to the pool but the server-side state is not touched not for 4 to 8 minutes. When the connection is reused, the first TDS packet sent to the server instructs the agent to reset the connection. You can t alter this behavior now that the Connection Reset key has been removed. This means that if the server is holding resources for the connection, they remain held until the connection is reused or the application ends. Microsoft suggests that developers disable connection pooling to immediately release these resources. I suggested to Microsoft that it give developers the option of resetting the connection on Close.

The best place to declare your script properties is right at the beginning of a script, where anyone reading your code will notice the declarations immediately There s no obligation to put property declarations here, though you can place them anywhere in the top level of the script You can t put them in a tell block or in a subroutine handler If you like, you can use script properties for storing information that doesn t change, but in many cases, you re better off simply hard-coding the information into the script What you ll usually find more useful is using script properties to store information that does change For example, you can store the folder in which the user last ran the script, and then use that folder as the default folder the next time, as shown here This example uses the choose folder command, which you ll meet in detail in 8

Summary

Again, add the values: jX = j30 + ( j110) = j(30 110) = j80 This is a pure capacitive reactance, because it is negative imaginary

Based on the feedback I get at conferences and from my customers, readers, and the developers I support online, connecting to SQL Server continues to be one of the most trouble-prone areas for both novice and expert developers. Sadly, it seems that there are as many opinions about how, when, and if to connect as there are healthcard lobbyists in Washington. For instance, Microsoft wants developers to use SSPI authentication. I do too, but I also urge caution. Some suggest that accessing SQL

Here s one thing you need to be careful about with script properties once you ve set a property correctly in a script and compiled the script, don t run the script so that you change the value before distributing the script otherwise, the script will start with the data you left in it Instead, compile the script, and check to make sure it s fine Then make a trivial change (for example, edit a comment) and compile the script again so that it remains as you wrote it

Server directly via ports is OK but I beg to disagree as I m concerned with hard-coding ports and network snooping. Building any connection strategy is all about what works for your application architecture and security infrastructure. In some cases the just-in-time connection strategy makes sense, but in others it incurs needless overhead. Sometimes the connection pool helps improve performance, but at other times it just gets in the way. Sometimes we as writers, consultants, and pundits make things a lot more complicated than they have to be by overloading our readers and clients with a lot of unnecessary detail. Considering that most SQL Server implementations are SQL Server Express, those that mold opinions need to remember to keep things simple whenever possible without compromising security or performance. For the most part, the developers I work with want solutions, not options. I hope this chapter has provided some of these solutions.