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Triggered when a component is in the process of being added to the control at design time Triggered when a component is added to the control at design time Triggered when a component is in the process of changing at design time Triggered when a contained component has changed at design time Triggered when a component is in the process of being removed Triggered when a component is removed at design time Triggered when a component is renamed

For example, the -g=string option is very useful for finding slow queries run on a particular table. For instance, to find queries in the log using the REGEXP construct, execute #> mysqldumpslow -g="REGEXP".

{ OracleConnection conn = new OracleConnection(); conn.ConnectionString = "Data Source=NEWDB; User ID=SYSTEM; Password=admin; Min Pool Size=10; Max Pool Size=100; Connection Lifetime=120; Connection Timeout=60; Incr Pool Size=3; Decr Pool Size=1;" try { conn.Open(); conn.Close(); MessageBox.Show("Connection successful!"); } catch (Exception ex) { MessageBox.Show(ex.ToString(), "Error connecting to Oracle"); } } The six connection string attributes used are explained in Table 3-1. Table 3-1. Connection Pool Attributes

OnComponentChanged(), which you can call to notify the designer about changes you re making to a control.

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The following example modifies the DirectoryTreeDesigner to use this service. Here s the basic idea rather than providing a designer verb for every possible drive, the context menu should show every drive except the currently selected one. For example, if the DirectoryTree.Drive property is currently set to C, the control s context menu should either hide (set DesignerVerb.Visible to false) or disable (set DesignerVerb.Enabled to false) the Set Drive C:\ command. The problem is that there are several possible ways to change the Drive property: through a designer verb, through the Properties window, through a type editor, and so on. Your designer needs to be notified of property changes no matter how they take place, and adjust the corresponding DesignerVerb object. The only way to do this is to react to the IComponentChangeService.ComponentChanged event. You can hook up the service by overriding the designer s Initialize() method: private IComponentChangeService changeService; public override void Initialize(IComponent component) { base.Initialize(component);

Another log that can be useful in determining exactly what s going on inside your system is the general query log, which records most common interactions with the database, including connection attempts, database selection (the USE statement), and all queries. If you want to see a realistic picture of the activity occurring on your database system, this is the log you should use. Remember that the binary log records only statements that change the database; it does not record SELECT statements, which, on some systems, comprise 90% or more of the total queries run on the database. Just like the slow query log, the general query log must first be enabled in your configuration file. Use the following line in your /etc/my.cnf file: log=/var/log/mysql/localhost.general.log Here, we ve set up our log file under the /var/log/mysql directory with the name general.log. You can put the general log anywhere you wish; just ensure that the mysql user has appropriate write permissions or ownership for the directory or file. Once you ve restarted the MySQL server, all queries executed against the database server will be written to the general query log file.

This attribute defines the minimum number of connections that must be kept in the pool. When the connection pool is first created, it will attempt to open and cache this number of connections in the pool even if no connection request was received. This attribute defines the maximum number of connections that can be kept in the pool. This attribute defines the maximum duration (in seconds) that a connection can stay cached in the pool. It is enforced after you close the connection from your application. You can see why this attribute is important in the following scenario: John has a cluster composed of two database servers running with connection pooling

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