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Mount points are the directory names under which file systems are mounted by the UNIX operating system. That is, the mount point refers to the top-level directory of a file system. Oracle recommends that all your Oracle mount points be named according to the convention /pm, where p is a string constant to distinguish itself from other mount points and m is a two-digit number. This means you can name your mount points /u01, /u02, /u03, and so on. Keep the mount point names simple, and don t include any hardware-related information in the mount point name. That way, changing your disk system hardware will not affect the mount point names. Oracle recommends that you have four mount points to fully comply with the OFA guidelines. The first of these is for locating the Oracle Database 11g server binaries, and the other three are for holding the database files. Let s say you re creating mount points for a database named prod. In this case, the three mount points designated for the datafiles can be clearly named as follows: /u01/ oradata/prod, /u02/oradata/prod, and /u03/oradata/prod. This nomenclature makes it clear that these file systems are meant for Oracle databases and that the data for different databases is stored on separate mount points.

new ThreadStart(navigatorSearch.Start);

In Linux and UNIX systems, a home directory is the directory that a user lands in when he or she first logs in. All home directories should follow the naming convention /pm/h/u, where pm is the mount point name, h is a standard directory name, and u refers to the directory owner. For example, the /u01/app/oracle directory could be the home directory for the user named oracle. Note that the

entire home directory for each user (e.g., /u01/app/oracle) is denoted by the letter h for the purposes of the following discussion.

During the installation, you ll be prompted for the path for several key Oracle directories, and I ll briefly discuss these in this section. You can use any directory structure you wish for these directories, but, as you ll see, following the standard directory structures recommended here makes it easy to administer multiple databases and software versions on the same server.

When the user clicks the Search button on the UI, NavigatorSearch requests CoordinatorSearch to start the search and fires a SearchRequested event that is wired to CoordinatorSearch.StartSearch. The Coordinator checks to see if a prior search is in progress. If so, that search is aborted. The FireSearchStart method checks to see if a handler is available for the OnSearchStart event. If so, the Coordinator creates a background thread and runs the search on it. Listing 11-14 shows C# and VB .NET implementations. Listing 11-14. The Code Used by CoordinatorSearch to Run Searches on a Background Thread C# public class CoordinatorSearch { Thread searchThread; public void StartSearch(string theFolderPath) { if (searchThread != null) if (searchThread.IsAlive) searchThread.Abort();

At the root of the Oracle directory structure is the directory called Oracle base, denoted by the environmental variable ORACLE_BASE. The Oracle base directory is the top directory for all Oracle software installations. As mentioned previously, Oracle recommends that you use the form /pm/h/u. The default owner of the Oracle base directory is usually a user named oracle, and the standard directory is usually named app. Therefore, the Oracle base directory usually has the form of /pm/app/ oracle (for example, /u01/app/oracle). The Oracle installer will take this as the default Oracle base and install all the software under this base directory. You can create the Oracle base directory by using the following commands (assuming that u01 is your mount point and user oracle is the Oracle software owner): # mkdir -p /u01/app/oracle # chown -R oracle:oinstall /u01/app/oracle # chmod -R 775 /u01/app/oracle

The Oracle home directory, denoted by the ORACLE_HOME environment variable, is very important, since the Oracle server software executable files and other configuration files are located under this directory. For example, the $ORACLE_HOME/bin directory holds the executables for the Oracle products, and the $ORACLE_HOME/network directory holds the Oracle Net Services files. In Oracle Database 11g, the OFA-recommended Oracle home directory path has changed. In order to comply with the OFA requirement of enabling the simultaneous running of multiple versions of Oracle software, you need to install Oracle software in a directory with the following path: /pm/h/u/product/v/type_[n], where the new variables have the following meanings: v: The version of the software type: The type of installation, such as database (db), client (client), or companion (companion) n: An optional counter, which enables you to install the same product multiple times under the same Oracle base directory In the preceding syntax for the Oracle home, the first part, /pm/h/u, is nothing but the Oracle base directory. Thus the Oracle home directory is always located underneath the Oracle base directory, and it can also be specified as $ORACLE_BASE/product/v/type_[n]. Using the preceding OFA-based Oracle home path, you can install different products the server and the client with the same release number (Oracle 11.1.0) in the same Oracle base directory.