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CHAPTER 12 USING SQL*PLUS AND iSQL*PLUS
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If you want to see the entire set of environment variables that you can control with the SET command, type help set. For performing your day-to-day tasks in SQL*Plus, you need to be familiar with several of these commands, and I will explain them briefly in the next section.
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Setting Common SQL*Plus Variables
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Variables are key attributes whose values you can change while using SQL*Plus. Table 12-2 summarizes the most common variables you will need to know. Practice with the variables will enhance your comfort level and help you become a skilled practitioner of SQL*Plus in a relatively short time. Beyond what is shown in the table, I haven t provided examples of the use of these variables, so it s important you actually try them out in your SQL*Plus session. Refer to the Oracle SQL*Plus manuals for usage guidelines for all the variables, including many variables that aren t listed in Table 12-2.
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In Table 12-2, the options inside square brackets show the alternative full name of the command. You can specify either the shortened version of a command or its long version. The options inside the curly brackets, {}, show the possible options you can choose and the default values. The value listed first inside the curly brackets is the default value. You can either leave it as is by not doing anything, or you can change it to the other possible values by using the SET variable value notation.
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Table 12-2. Common SQL*Plus Environment Variables
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Variable
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ARRAY[SIZE] AUTO[COMMIT] COLSEP COPY[COMMIT] DEF[INE]{&/C/ON/OFF} ECHO {OFF/ON}
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Function
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Determines the number of rows fetched from database at one time Specifies whether commits of transactions are automatic or manual Specifies the text that you want printed in between column values Sets the frequency of commits when using the COPY command Sets the prefix character used during variable substitutions Specifies whether echo is on or off; if you have ECHO ON, each command will be displayed before its output onscreen Sets the default filename when you use your default editor Specifies whether SQL*Plus shows the number of records returned by your query Determines whether output is buffered or flushed to the screen Specifies whether the column headers are printed or not Specifies the number of characters displayed per line
Usage
SET ARRAY 50 SET AUTO ON SET COLSEP SET COPY 10000 SET DEFINE ON SET ECHO ON
EDITF[ILE] FEED[BACK] {OFF/ON}
SET EDITFILE draft.sql SET FEEDBACK OFF
FLUSH {OFF/ON} HEA[DING] {OFF/ON} LIN[ESIZE] {80|n}
SET FLUSH OFF SET HEAD OFF SET LINESIZE 40
CHAPTER 12 USING SQL*PLUS AND iSQL*PLUS
Variable
LONG {80/n}
Function
Specifies the maximum width of the LONG, CLOB, NCLOB, and XMLType values Specifies the number of blank lines at the top of each new page Specifies the format for displaying numbers Specifies the number of lines in each page Specifies the amount of output that is printed to the screen Specifies whether output of PL/SQL code is shown Specifies the command prompt for SQL*Plus sessions Specifies whether command file output is displayed or not Displays time if set to on Controls the display of timing for SQL commands Specifies whether SQL text is displayed after variable substitution
Usage
SET LONG 100000
NEWP[AGE] {1/n/none} NUM[WIDTH] {10/n} PAGES[IZE] {24/n} PAU[SE] {OFF/ON/TEXT} SERVEROUT[PUT] {OFF/ON}[SIZE n] SQLP[ROMPT] {SQL> |TEXT} TERM[OUT] {OFF/ON} TI[ME] {OFF/ON} TIMI[NG] {OFF/ON} VER[IFY] {OFF/ON}
SET NEWPAGE 0 SET NUM SET PAGESIZE 60 SET PAUSE ON SET SERVEROUTPUT ON SET SQLPROMPT 'salapati >' SET TERMOUT OFF SET TIME OFF SET TIMING OFF SET VERIFY OFF
If you don t want the X rows selected and PL/SQL procedure successfully completed messages after Tip you execute code in SQL*Plus, use the following command:
SET FEEDBACK OFF
You can have all your preferred session settings stored in a file, which you can execute like any other SQL file whenever you want to change a bunch of variable values at once. You can also have several of these files saved for different tasks, if your job involves a lot of reporting using the SQL*Plus interface. If you are using the Oracle SQL*Plus GUI 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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