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576 ms 13 822118176 (822118176) 16784 ms 20140 ms 17556 ms 14 * * * 15 * * * 16 * * * 17 * * * With the traceroute command, you ll see every router that s passed For each router, the name of the router is displayed, followed by its IP address and then the roundtrip times of the three packets that were sent to that router You ll often see that a router replies with only a string of three asterisks (* * *), which indicates that the router forwards packets normally but is configured not to reply to ping packets for security reasons..

You chose only two character-string columns per query to simplify things. Extending this to handle result tables with different numbers of columns and column data types isn t hard.

s Note It s important to keep transactions pending for the shortest period of time. A lock stops others from accessing the locked database resource. Too many locks, or locks on frequently accessed resources, can seriously degrade performance.

Summary

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When the ping and traceroute commands show that everything is working, you re the proud owner of a working network interface. Next you can test the availability of two kinds of services: those on your computer itself and those on external computers. Because so many tools are available to test service availability, I won t try to cover them all, but I do want to discuss two of the most popular. First is the netstat tool, which you can use to test for the availability of services on the host where you run the command. And second is nmap, which is used to test availability on other hosts.

In this chapter you used data readers to perform a variety of common tasks, from simply looping through single result sets to handling multiple result sets. You learned how to retrieve values for columns by column name and index, and learned about methods available for handling values of different data types. You also learned how to get information about result sets and get schema information. In the next chapter, we ll cover the really interesting aspect of ADO.NET: handling database data while disconnected from a database.

A transaction is characterized by four properties, often referred to as the ACID properties: atomicity, consistency, isolation, and durability.

Caution Some administrators consider any use of nmap on their hosts or their network as an attack

n 7 you saw how to use data readers to access database data in a connected, forward-only, read-only fashion. Often, this is all you want to do, and a data reader suits your purposes perfectly. In this chapter, you ll look at a new object for accessing data, the dataset. Unlike data readers, which are objects of data provider-specific classes that implement the System.Data.IDataReader interface, datasets are objects of the class System.Data.DataSet, a distinct ADO.NET component used by all data providers. Datasets are completely independent of and can be used either connected to or disconnected from data sources. Their fundamental purpose is to provide a relational view of data stored in an in-memory cache.

s Note In yet another somewhat confusing bit of terminology, the class is named DataSet, but the generic term is spelled dataset (when one expects data set). Why Microsoft does this is unclear, especially since data set is the more common usage outside ADO.NET. Nonetheless, we ll follow the .NET convention and call DataSet objects datasets.

Atomicity: A transaction is atomic if it s regarded as a single action rather than a collection of separate operations So, only when all the separate operations succeed does a transaction succeed and is committed to the database On the other hand, if a single operation fails during the transaction, everything is considered to have failed and must be undone (rolled back) if it has already taken place In the case of the order-entry system of the Northwind database, when you enter an order into the Orders and Order Details tables, data will be saved together in both tables, or it won t be saved at all Consistency: The transaction should leave the database in a consistent state whether or not it completed successfully The data modified by the transaction must comply with all the constraints placed on the columns in order to maintain data integrity.

against their security, and therefore won t allow it. I once used it in a hotel room in the United States to see if my server in Amsterdam was still offering all its services, and the hotel network shut me off immediately. In these circumstances, it can be a real pain to get your connection back, so be careful.

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