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One low-level detail that s worth noting even though you shouldn t change it is connection pooling. Recall that creating connections is expensive in terms of memory and time. With pooling, a closed connection isn t immediately destroyed but is kept in memory in a pool of unused connections. If a new connection request comes in that matches the properties of one of the unused connections in the pool, then the unused connection is used for the new database session. Creating a totally new connection over the network can take seconds, whereas reusing a pooled connection can happen in milliseconds; it s much faster to use pooled connections. The connection string has parameters that can change the size of the connection pool or even turn off connection pooling. The default values (for example, connection pooling is on by default) are appropriate for the vast majority of applications. See BOL for details.

second kind of process is the interactive process These processes are started by users from a shell Any command started by a user and producing output on the standard output is an interactive process To start an interactive process, a user needs to type the corresponding command The process then runs as a child process from the shell in which the user entered the command The process will do its work and will terminate when it s finished While terminating, it will write its exit status to its parent (which is the shell if the process was an interactive process) Only after a child process has told its parent that it has terminated can it be closed properly.

The code in the first sample program was trivial, so you could concentrate on how connections work. Let s enhance it a bit.

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3. Click the Download button to download SQL2000SampleDb.msi, and click Save in the dialog box that appears. 4. Specify your installation location (such as the desktop) and click Save. When the download is complete, click Close. 5. Run the SQL2000SampleDb.msi file to start the installation process. The Welcome window shown in Figure 1-3 will appear. Click Next.

In case the parent is no longer present (which is generally considered an error condition), the child process will become a so-called zombie process, and it won t be possible to perform any management on the process, except for trying to restart the parent process In general, zombie processes are the result of bad programming You should try to upgrade (or maybe rewrite) your software if you see too many of them The concepts of parent and child processes are universal on your system The init process is started by upstart (which we ll cover later) as the first process and from there, all other processes are started You can get an overview of the hierarchical process structure by using the pstree command, which provides a result such as in Listing 6-1 Listing 6-1 The pstree Command Shows Relations Between Parent and Child Processes.

In ConnectionSql you created the connection and specified the connection string in separate steps. Because you always have to specify a connection string, you can use an overloaded version of the constructor that takes the connection string as an argument:

Figure 1-3. Northwind installation scripts Setup Wizard Welcome window 6. When the License Agreement window appears, click the I Agree radio button, and then click the now-enabled Next button. 7. When the Choose Installation Options window appears, click Next. 8. When the Confirm Installation window appears, click Next. 9. A progress window briefly appears, followed by the Installation Complete window (see Figure 1-4). Click Close.

' Create connection Dim conn As SqlConnection = New SqlConnection( _ "server = (local)\netsdk;integrated security = sspi;" _ )

init ----apache2----5*[apache2] |--atd |--cron |--dd |--dhclient3 |--events/0 |--5*[getty] |--khelper |--klogd Although interactive processes are important to users working on your machine, daemon processes are more important on a server that is providing services Daemon processes typically run in the background and normally don't send any output to the terminal To see what they are doing, you must check the log files to which the daemon processes write Generally speaking, it s a good idea to start with /var/log/messages if you are looking for daemon output From a perspective of process management, it doesn't really matter if you re working with daemon or interactive processes: both can be handled the same way using the same commands..

This constructor sets the ConnectionString property when creating the SqlConnection object. We ll try it in the next examples and use it in later chapters.

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