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In this example, DATAFILE takes a file type (DATAFILE), which indicates that we re going to use the file as a data file. Here, CREATE TABLESPACE works with a disk group and not with a disk in that group. Note that we don t even refer to a data file. The ASM system does indeed create a data file, though it doesn t compare to regular data files. ASM spreads its files across every disk in the disk group, so you can t rely on a backup of a single disk to hold the entire data file. It should also be noted that ASM files have a permanent redundancy level and striping policy, which is different from normal data files. ASM files are OMF files, and Oracle will remove them when you don t need them. Note that if you give an ASM file a user alias, Oracle doesn t consider that file an OMF file, so it can t automatically delete it.

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This last rsync command adds the -z switch:

You can use the for-do-done loop when you have to process a list of items. For each item in the list, the loop executes the commands within it. Processing will continue until the list elements are exhausted. The syntax of the for-do-done loop is as follows: for var in list do commands done Here s an example of a for-do-done loop (the for command uses the letter F as a variable to process the list of files in a directory): #!/usr/bin/sh ## this loop gives you a list of all files (not directories) ## in a specified directory. for F in /u01/app/oracle do if [ -f $F] then ls $F fi

An until-do-done loop executes the commands inside the loop until a certain condition becomes true. The loop executes as long as the condition remains false. Here s the general syntax for the until-do-done loop: until condition do commands done The following is a simple example that shows how to use the until-do-done loop. The print command outputs the sentence within the quotes on the screen. The -n option specifies that the output should be placed on a new line. The UNIX command read will read a user s input and place it in the answer variable. The script then will continue to run until the user inputs the answer YES : until [[ $answer = "yes" ]];do print -n "Please accept by entering \"YES\": " read answer print "" done

The case structure is quite different from all the other conditional statements. This structure lets the program branch to a segment of the program based on the value of a certain variable. The variable s value is checked against several patterns, and when the patterns match, the commands associated with that pattern will be executed. Here s the general syntax of the case command: case var in pattern1) commands ;; pattern2) commands ;; ... patternn) commands ;; esac Note that the end of the case statement is marked by esac (which is case spelled backwards). Here s a simple example that illustrates the use of the case command: #!/usr/bin/sh echo " Enter b to see the list of books" echo " Enter t to see the library timings" echo " Enter e to exit the menu" echo echo "Please enter a choice": \c" read VAR case $VAR in b/B) book.sh ;; t/T) times.sh ;;

When you execute your shell program, UNIX creates an active instance of your program, called the process. UNIX also assigns your process a unique identification number, called the process ID (PID). As a DBA, you need to know how to track the processes that pertain to your programs and the database instance that you are managing.

rsync -avz -e ssh user@remotehost:/src/dir/ /local/dest/dir/

The ps command, with its many options, is what you ll use to gather information about the currently running processes on your system. The ps -ef command will let you know the process ID, the user, the program the user is executing, and the length of the program s execution. In the following example, the ps -ef command is issued to display the list of processes, but because the list is going to be very long, the pipe command is used to filter the results. The grep command ensures that the list displays only those processes that contain the word pmon . The pmon process is an essential Oracle background process, and I explain it in 4. The output indicates that three different Oracle databases are currently running: $ ps -ef | grep pmon oracle 10703 1 oracle 18655 1 oracle 10984 1 $ 0 0 0 09:05:39 09:24:00 09:17:50 0.00 0.00 0.00 ora_pmon_test ora_pmon_prod1 ora_pmon_finance

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