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Follow these steps to create a new virtual private catalog owner: 1. Start SQL*Plus and connect to the recovery catalog database as a user with administrator privileges (SYS). For example: SQL> connect sys/sammyy1 as sysdba 2. Execute the following statement to create the virtual private catalog owner: SQL> CREATE USER virtual1 IDENTIFIED BY virtual1 DEFAULT TABLESPACE virtual_tbsp1 3. Grant the new owner the RECOVERY_CATALOG_OWNER role: SQL> GRANT recovery_catalog_owner TO virtual1; Start RMAN and connect as the base recovery catalog owner: RMAN> CONNECT CATALOG rman/rman@catdb 4. So the new virtual recovery catalog owner can work with databases, grant the privileges necessary: RMAN> GRANT CATALOG FOR DATABASE prod1 to virtual1; The previous command grants rights to the virtual private catalog owner virtual1 to manage the prod1 database. The GRANT CATALOG command grants access to the user virtual1 for just the prod1 database. You can optionally grant the new user the capability to register new databases in the virtual private catalog owned by virtual1 by issuing the REGISTER DATABASE command as shown here: RMAN> GRANT REGISTER DATABASE TO virtual1; Now that the new virtual private catalog owner has been created, it s time to create the virtual private catalog itself.

You can use the following relations with the test command while comparing integers: -ne: Not equal -eq: Equal -lt: Less than -gt: Greater than -ge: Greater than or equal to -le: Less than or equal to

It s common to use arguments to specify parameters to shell programs. For example, you can run the shell program example.ksh as follows: $ example.ksh prod1 system In this case, example.ksh is your shell script, and the command-line arguments are prod1, the database name, and system, the username in the database. There are two arguments inside the shell script referred to as $1 and $2, and these arguments correspond to prod1 and system. UNIX uses a positional system, meaning that the first argument after the shell script s name is the variable $1, the second argument is the value of the variable $2, and so on. Thus, whenever there s a reference to $1 inside the shell script, you know the variable is referring to the first argument (prod1, the database name, in this example). By using command-line arguments, the script can be reused for several database and username combinations you don t have to change the script.

Which type of coupling is worse: static or dynamic The short answer is static coupling, because it manifests itself at compile time If class A were statically coupled to class B, then changes to B could break the compilation of A Class A would then need to be changed to make it compilable again In a large project, changes to one class could break any number of classes that were statically coupled to it, and would require widespread changes throughout the system Dynamic coupling is much less a problem during the development phase If class A were dynamically coupled to class B, then A would only require B in order to run Since B wouldn t have to be present at compile time, you could change B in any way you want, without ever breaking the compilation of A.

Let s look at a simple database-monitoring shell script, example.ksh. This script looks for a certain file and lets you know if it fails to find it. The script uses one command-line argument to specify the name of the database. You therefore will expect to find a $1 variable in the script. When the shell program is created, UNIX has no way of knowing it s an executable program. You make your little program an executable shell script by using the chmod command: $ ll example.ksh -rw-rw-rw- 1 salapati $ chmod 766 example.ksh $ ll example.ksh 4-rwxrw-rw- 1 salapati $ dba 439 feb 02 16:51 example.ksh

16:52

You can see that when the script was first created, it wasn t executable, because it didn t have the execution permissions set for anyone. By using the chmod command, the execution permission is granted to the owner of the program, salapati, and now the program is an executable shell script. Here are the contents of the example.ksh shell script, which looks for a certain file in a directory and sends out an e-mail to the DBA if the file is not found there: #!/bin/ksh ORACLE_SID=$1 export ORACLE_SID PATH=/usr/bin:/usr/local/bin:/usr/contrib./bin:$PATH export PATH ORACLE_BASE=${ORACLE_HOME}/../..;

Any catastrophes caused by changes to B would only show up when running A On the other hand, static coupling is a safer form of coupling than dynamic coupling, from a certain perspective, and here s why: If two classes A and B are statically coupled, the compiler needs B to be available in order to compile A The compiler is able to type-check any references A makes to items belonging to B, and this type checking can be immensely valuable in finding errors in source code Dynamic coupling impacts the system at run time, when the compiler is long gone from the scene (at least with compiled languages like C# and Java) Errors related to dynamic coupling show up only at run time It s important to remember that the presence of dynamic coupling doesn t preclude static coupling.