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Connection pooling is enabled by default in ODP.NET, and I recommend that you keep it enabled for performance gains. Take note, however, that it is possible for the connection pool to get corrupted at times and for many reasons. For example, consider the following scenario: The network connection between your application and the database server might have dropped momentarily, and on resumption of service, you try to reconnect to the database. You will find that any attempt to use the connection object will result in an exception, because Oracle s connection pooling feature is unaware that a connection has gone bad and will keep handing you the same bad connection. In such cases, you might wish to clear the connection pool. Fortunately, ODP.NET allows you to clear the connection pool quite easily using the static ClearAllPools method. To try this, drag a new button to your form, and name it btnClearPool. In the Click event of this button, write the code shown in Listing 3-6 below to clear all connection pools.

Identifies a color that becomes transparent. Any occurrence of this color becomes invisible whether it is in the form background, another control, or even a picture contained inside a control. These transparent settings act like holes in your window. You can even click to activate another window if you see it through a transparent region. This feature is supported only on Windows 2000 or later. This is one of the techniques that allow you to create shaped, skinnable forms (the other property is Region, which lets you define a nonrectangular border). Both of these techniques are described in 23.

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Let s examine what the general query log looks like. Listing 6-20 shows an excerpt from our general query log during our ApacheBench benchmark tests from earlier in this chapter. Listing 6-20. Excerpt from the General Query Log # head -n 40 /var/log/mysql/mysqld.log /usr/local/libexec/mysqld, Version: 4.1.10-log. started with: Tcp port: 3306 Unix socket: /var/lib/mysql/mysql.sock Time Id Command Argument 050309 16:56:19 1 Connect root@localhost on 050309 16:56:36 1 Quit 050309 16:56:52 2 Connect test@localhost as anonymous on 3 Connect test@localhost as anonymous on 4 Connect test@localhost as anonymous on 5 Connect test@localhost as anonymous on 6 Connect test@localhost as anonymous on 7 Connect test@localhost as anonymous on 8 Connect test@localhost as anonymous on 9 Connect test@localhost as anonymous on 2 Init DB test 2 Query SELECT * FROM http_auth WHERE username 3 Init DB test 3 Query SELECT * FROM http_auth WHERE username 4 Init DB test 4 Query SELECT * FROM http_auth WHERE username 5 Init DB test 5 Query SELECT * FROM http_auth WHERE username 6 Init DB test 6 Query SELECT * FROM http_auth WHERE username 7 Init DB test 7 Query SELECT * FROM http_auth WHERE username 8 Init DB test 8 Query SELECT * FROM http_auth WHERE username 9 Init DB test 9 Query SELECT * FROM http_auth WHERE username 10 Connect test@localhost as anonymous on 10 Init DB test 10 Query SELECT * FROM http_auth WHERE username 050309 16:56:53 11 Connect test@localhost as anonymous on 11 Init DB test 11 Query SELECT * FROM http_auth WHERE username 2 Quit 9 Quit 7 Quit 5 Quit 8 Quit

The Form class defines references to two special buttons, as shown in Table 3-2. These properties add automatic support for the Enter and Esc keys. If you don t set these properties, the Enter and Esc keys will have no effect.

public void btnClearPool_Click(System.Object sender, System.EventArgs e)

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The button referenced by this property is automatically clicked when the user presses the Enter key. (In other words, its Click event fires.) This button is also sometimes known as the default button. On a form, the default button should always be the least-threatening button. Typically, this is a form s OK or Close button, unless that button could accidentally commit irreversible changes or discard work in progress. The button referenced by this property is automatically clicked when the user presses the Esc key. (In other words, its Click event fires.) This is usually a Cancel button.

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