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Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\> The results of the ping command show that the connection is successful. If the connection can t be made, you ll see a connection request timed out message, and the number of sent packets of data will be more than the number of received packets in the ping statistics. 4. The TCP/IP protocol must be installed on both the server and the client; if you install Oracle server and client software, these protocols are automatically installed in the form of the Oracle Net software component. 5. Ensure that the Oracle Net Listener service is running on the server and is listening at the appropriate port for incoming requests for connections. 6. Configure the client for connecting to the database. You can connect to an Oracle database by using one of four available methods: local naming, easy connect naming, directory naming, and external naming. I discuss these methods later in this chapter. 7. Connect to the database with SQL*Plus or a third-party tool. For example, with SQL*Plus you can connect to the database by providing the username/password combination and the database name: C:\> sqlplus system/sammyy1@orcl SQL*Plus: Release 11.1.0.6.0 - Production on Thu Mar 20 09:25:27 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> In the following sections, I ll discuss the Oracle Client, the listener, and naming methods in more detail.

// class WorkerOrderEntry public class WorkerOrderEntry : System.Windows.Forms.UserControl { // public WorkerOrderEntry() { // This call is required by the Windows.Forms Form Designer. InitializeComponent(); }

The system change number, or SCN, is an important quantifier that the Oracle database uses to keep track of its state at any given point in time. When you read (SELECT) the data in the tables, you don t affect the state of the database, but when you modify, insert, or delete a row, the state of the database is different from what it was before. Oracle uses the SCN to keep track of all the changes made to the database over time. The SCN is a logical time stamp that is used by Oracle to order events that occur

within the database The SCN is very important for several reasons, not the least of which is the recovery of the database after a crash SCNs are like increasing sequence numbers, and Oracle increments them in the SGA When a transaction modifies or inserts data, Oracle first writes a new SCN to the rollback segment The log writer process then writes the commit record of the transaction immediately to the redo log, and this commit record will have the unique SCN of the new transaction In fact, the writing of this SCN to the redo log file denotes a committed transaction in an Oracle database The SCN helps Oracle determine whether crash recovery is needed after a sudden termination of the database instance or after a SHUTDOWN ABORT command is issued Every time the database performs a checkpoint operation, Oracle writes a START SCN command to the datafile headers.

The control file maintains an SCN value for each datafile, called the STOP SCN, which is usually set to infinity, and every time the instance is stopped normally (with the SHUTDOWN NORMAL or SHUTDOWN IMMEDIATE command), Oracle copies the START SCN number in the datafile headers to the STOP SCN numbers for the datafiles in the control file When you restart the database after a graceful shutdown, there is no need for any kind of recovery because the SCNs in the datafiles and the control files match On the other hand, abrupt instance termination does not leave time for this matching of SCNs, and Oracle recognizes that instance recovery is required because of the varying SCN numbers in the datafiles on the one hand and the control file on the other As you ll learn in 16, they play a critical role during database recovery.

// private void comboBoxModel_SelectedIndexChanged(object sender, System.EventArgs e) { comboBoxStyle.Items.Clear(); string model = comboBoxModel.Text; string[] styles = FireGetStyles(model); if (styles == null) return; if (styles.Length == 0) return; comboBoxStyle.Items.AddRange(styles); comboBoxStyle.SelectedIndex = 0; } private void comboBoxStyle_SelectedIndexChanged(object sender, System.EventArgs e) { treeViewOptions.Nodes.Clear(); string model = comboBoxModel.Text; string style = comboBoxStyle.Text; ArrayList options = FireGetOptions(model, style); if (options != null) PopulateOptions(options); Color[] colors = FireGetColors(model, style); comboBoxColor.Items.Clear(); if (colors == null) return; if (colors.Length == 0) return; foreach (Color color in colors) comboBoxColor.Items.Add(color.ToKnownColor().ToString()); comboBoxColor.SelectedIndex = 0; } // each entry in the Options is a PricedItem array. In each array, the // first element is the option category, the remaining elements // are the options for the given category void PopulateOptions(ArrayList theOptions) { if (theOptions == null) return; foreach (PricedItem[] options in theOptions) PopulateOption(options); treeViewOptions.ExpandAll(); } // first item is category, remainders are options void PopulateOption(PricedItem[] theOptions) { if (theOptions.Length == 0) return;

Oracle determines how far back you should apply the archived redo logs during a recovery based on the SCN..