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If you are using the Oracle SQL*Plus interface on Windows, you can change the environment variables for your session by using the Options menu and choosing Environment. You are shown all the current environment variables for your session, and you can modify them as long as you stay within the limits. If you are logged into SQL*Plus through a UNIX server s X Window Session, you lose this easy way to change the values of your environment variables.
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One of the most important commands that you ll use is the SET SERVEROUTPUT command, which determines whether the output of a PL/SQL code segment or a stored procedure is displayed on screen. If you set SERVEROUTPUT ON, you ll see the output. By default, the SERVEROUTPUT variable is set to OFF, and you may be caught by surprise when you run a PL/SQL block that should output something on the screen, but you don t see anything there. Here s an example that shows how you can use the SERVEROUTPUT variable to display the output from the DBMS_OUTPUT package. This package contains a procedure named PUT_LINE, which outputs a line. By setting SERVEROUTPUT ON, you can see the output printed by the PUT_LINE procedure: SET SERVEROUTPUT ON BEGIN dbms_output.put_line('This is dbms_output.put_line('This is dbms_output.put_line('This is END; SQL> / This is the first line This is the second line This is the last line PL/SQL procedure successfully SQL>
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the first line'); the second line'); the last line');
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If you hadn t set the SERVEROUTPUT variable to the value of ON in the preceding example, you wouldn t have seen any of the output of the PUT_LINE procedure. You can use the FORMAT clauses of the SERVEROUTPUT command to determine how the output is formatted. The FORMAT clause can take the values WRAPPED, WORD_WRAPPED, or TRUNCATED. The default is WRAPPED, meaning that the output is wrapped within the length specified by LINESIZE, and new lines are started as required. Let s look at a short example for each of the other two FORMAT clauses, WORD_WRAPPED and TRUNCATED. The WORD_WRAPPED option for FORMAT wraps each line to the length specified by the value of the LINESIZE variable, and if an entire word won t fit at the end of a line, the line ends before the word. SQL> SET SERVEROUTPUT ON FORMAT WORD_WRAPPED SQL> SET LINESIZE 20 SQL> BEGIN 2 > dbms_output.put_line('After the first 20 characters please'); 3 > dbms_output.put_line('continue on the second line'); 4 > END; 5 > / After the first 20 characters please continue on the second line When you use the TRUNCATED formatting option, each line of the displayed output is truncated exactly at the length specified by the LINESIZE variable.
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SQL> SET SERVEROUTPUT ON FORMAT TRUNCATED SQL> SET LINESIZE 20 SQL> BEGIN 2 > DBMS_OUTPUT.PUT_LINE('After the first 20 characters please'); 3 > DBMS_OUTPUT.PUT_LINE('continue on the second line'); 4 > END; 5 > / After the first 20 c continue on the seco
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Users don t have to manually set their SQL*Plus environment each time they log into SQL*Plus Oracle allows you to specify your variable preferences in a site profile file, called glogin.sql. You can use the glogin.sql file to configure identical environment settings for all users.
Note
The glogin.sql file applies to all the users of the system, and therefore it is called a site profile. If you want all SQL*Plus sessions to have a specific set of environment variable values upon logging in, all you have to do is edit the glogin.sql file. Only DBAs, not individual users, can access the glogin.sql file.
The site profile is created during installation, and the file is placed in the $ORACLE_HOME/sqlplus/ admin directory. Listing 4-4 shows the default glogin.sql file, which is read by Oracle every time you log into SQL*Plus. You can add various settings to the glogin.sql file to suit your needs. In previous versions of the Oracle database, the glogin.sql file contained various formatting commands for the SQL*Plus interface that automatically configured environmental variables for any user who logged into SQL*Plus. The database would run the glogin.sql file first when you logged into SQL*Plus, followed by the running of the login.sql file. In Oracle Database 11g, the glogin.sql site profile file is invoked automatically as before, when you log into SQL*Plus. However, the file is blank now, as shown in Listing 4-4. Listing 4-4. The Default glogin.sql File -------------Copyright (c) 1988, 2005, Oracle. All Rights Reserved. NAME glogin.sql DESCRIPTION SQL*Plus global login "site profile" file Add any SQL*Plus commands here that are to be executed when a user starts SQL*Plus, or uses the SQL*Plus CONNECT command. USAGE This script is automatically run
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