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Every Oracle database has several administrative files associated with it. Among these files are configuration files, core dump files, trace files, export files, and other related log files. You need to store these files under separate directories for ease of maintenance. Assuming you have about ten or so of these directories for each database, you can see why it s imperative that you have a simple means of organizing them. Oracle recommends the following directory structure for clarity: /h/ admin/d/a, where h is the Oracle base directory (e.g., /u01/app/oracle), admin indicates that this directory holds administration-related files, d refers to the specific database, and a refers to the subdirectories for each specific type of administrative files. For example, the /u01/app/oracle/ admin/prod1/bdump directory will contain all background process trace files as well as the all-important alert log files for the prod1 database. Table 9-1 lists some of the standard administrative directories that you ll need in most cases. Of course, you may add to the recommended list or modify it to fit your circumstances.

#Region "Events" Public Event OnSearchRequested(ByVal theFolderPath As String) Sub FireSearchRequested(ByVal theFolderPath As String) RaiseEvent OnSearchRequested(theFolderPath) End Sub Public Event OnItemFound(ByVal thePath As String, _ ByVal theCurrentCount As Integer) Sub FireItemFound(ByVal thePath As String, ByVal theCurrentCount As Integer) RaiseEvent OnItemFound(thePath, theCurrentCount) End Sub Public Event OnMessage(ByVal theMessage As String) Sub FireMessage(ByVal theMessage As String) RaiseEvent OnMessage(theMessage) End Sub #End Region End Class Each time NavigatorSearch finds a file matching the search expression, it fires an OnItemFound event. The ItemFound signal is wired to CoordinatorSearch.ItemFound. The purpose of the notification is to show the filename and the number of files found, requiring the UI to be updated. Since the NavigatorSearch.ItemFound signal is sent on a background thread, CoordinatorSearch must switch to the UI thread before forwarding ItemFound to ContentSearchResults. Listing 11-17 and Listing 11-18 show the details. Listing 11-17. How CoordinatorSearch Switches to the UI Thread Before Forwarding Notifications to UI Elements (C# Code) public class CoordinatorSearch { Control uiControl; public CoordinatorSearch(Control theUiControl) { uiControl = theUiControl; } public void ItemFound(string thePath, int theCurrentCount) { FireItemFound(thePath, theCurrentCount); if (theCurrentCount == 1) FireMessage("1 item found"); else FireMessage(string.Format("{0} items found", theCurrentCount)); } public delegate void ItemFoundHandler(string thePath, int theCurrentCount); public event ItemFoundHandler OnItemFound; void FireItemFound(string thePath, int theCurrentCount) { if (OnItemFound != null) uiControl.Invoke(OnItemFound, new object[] {thePath, theCurrentCount}); }

Contains ad hoc SQL files Contains archived redo log files Contains SQL scripts that you can use for creating your databases Contains the Data Pump Export files Contains instance parameter files (such as init.ora)

The whole idea behind properly naming and placing the product files is to be able to implement multiple versions of the Oracle server software simultaneously. This is necessary because when you migrate between versions, it is normal to retain the older software versions until you switch over to the new version. Different applications on the system may have different timeframes within which they want to migrate to the new version. Consequently, in most cases, you ll end up having to support multiple versions of the Oracle server software simultaneously. Oracle recommends that you keep each version of the software in a separate directory distinguished by the naming convention /h/product/v, where h is the home directory, product indicates that the software versions are under this directory, and v is the version of the product. For example, I have a directory on my system called /u01/app/oracle/product/10.1.0.2.0 under which I save all the Oracle server software subdirectories during installation. If I decide to install the 10.2.0 version, I ll do so under the directory /u01/app/oracle/product/10.2.0. You can see that this type of naming convention makes it very easy to install and manage multiple versions of the Oracle software.

public delegate void MessageHandler(string theMessage); public event MessageHandler OnMessage; private void FireMessage(string theMessage) { if (OnMessage != null) uiControl.Invoke(OnMessage, new object[] {theMessage}); } } Listing 11-18. How CoordinatorSearch Switches to the UI Thread Before Forwarding Notifications to UI Elements (VB .NET Code) Public Class CoordinatorSearch Private _uiControl As Control Public Sub New(ByVal theUiControl As Control) _uiControl = theUiControl End Sub Public Sub ItemFound(ByVal thePath As String, ByVal theCurrentCount As Integer) FireItemFound(thePath, theCurrentCount) If (theCurrentCount = 1) Then FireMessage("1 item found") Else FireMessage(String.Format("{0} items found", theCurrentCount)) End If End Sub Public Delegate Sub ItemFoundHandler(ByVal thePath As String, _ ByVal theCurrentCount As Integer) Public Event OnItemFound As ItemFoundHandler Sub FireItemFound(ByVal thePath As String, ByVal theCurrentCount As Integer) _uiControl.Invoke(New ItemFoundHandler(AddressOf DoFireItemFound), _ New Object() {thePath, theCurrentCount}) End Sub Sub DoFireItemFound(ByVal thePath As String, ByVal theCurrentCount As Integer) RaiseEvent OnItemFound(thePath, theCurrentCount) End Sub