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In Oracle Database 10g, 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 variables in the Oracle home directory path have the following meanings: pm: The mount point name h: The standard directory name u: The owner of the directory, usually named oracle 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, /pm/h/u/product/v_type_[n], 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 10.2.0 here) in the same Oracle base directory.

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Note The formal name for the Oracle database server version in this book is Oracle Database 10g Release 2. However, you ll occasionally see references to 10.2, 10.2.0, or Oracle 10.2, all of which are alternative names for the same software.

This allows the C++/CLI compiler to ensure that local variables and parameters of this proxy type have the same binary layout as a local variable of the equivalent native type Since managed local variables and parameters are not relocated on the stack (in contrast to instances on the GC heap), an address to a local variable or parameter of this managed proxy type can be treated as a pointer to the equivalent native type The following program uses the RECT structure as a local variable and passes an address to this variable to GetWindowRect: // GetDesktopResolutioncpp // build with "cl /clr GetDesktopResolutioncpp" #include <windowsh>.

/u01/app/oracle/product/10.2.0/db_1 /u01/app/oracle/product/10.2.0/client_1 The db_1 and client_1 at the end of the paths indicate that these are the Oracle home directories for the first installation of the Oracle database and the Oracle client software, respectively. Oracle supports multiple Oracle homes, but you can t install products from one release of Oracle into an Oracle home directory of a different release. You must install the Oracle Database 10.2 software into a new Oracle home directory. For example, you can t install release 10.2 software into an existing Oracle9i Oracle home directory. You can install this release more than once on the same system, however, as long as you choose a separate Oracle home directory for each release. It s also okay to install the same product multiple times in the Oracle home directory, as shown here: /u01/app/oracle/product/10.2.0/db_1 /u01/app/oracle/product/10.2.0/db_2 Once you finish your Oracle software installation, set your ORACLE_HOME environment variable to specify your Oracle home directory.

Oracle uses a special directory called the Oracle Inventory Directory, also known as OraInventory, to store an inventory of all the Oracle software on a server. Multiple Oracle installations can share the same Oracle Inventory Directory. You need to specify the path for this directory only the first time you install an Oracle product on a server. The usual format of this directory is as follows:

The shadow file is updated only when this script is run. If the password saved in the shadow file isn t the same as the current one in the passwd file, some updates need to be made to the shadow file.

$ORACLE_BASE/ora_inventory For example, if /u01/app/oracle is your ORACLE_BASE directory location, then the Oracle Inventory Directory will be: /u01/app/oracle/ora_inventory The first time you install Oracle software, the installer prompts for the OraInventory directory path, and creates the directory itself.