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SQL*Plus Administrative Commands
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SQL*Plus offers a set of database administration and management commands that help you perform administrative chores. I briefly explain these commands in the following sections.
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CLEAR Command
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The CLEAR command removes several current settings, including settings for columns and the SQL*Plus buffer. You use the CLEAR command to make sure that settings no longer needed are not in force in the current session of SQL*Plus. Listing 4-7 shows sample output of the CLEAR command. Listing 4-7. Using the CLEAR Command SQL> CLEAR BREAKS breaks cleared SQL> CLEAR BUFFER buffer cleared SQL> CLEAR COLUMNS columns cleared SQL> CLEAR SQL sql cleared SQL> CLEAR TIMING SQL> CLEAR SCREEN The CLEAR command by itself clears your screen without affecting any of the settings of SQL*Plus. The CLEAR BUFFER and CLEAR SQL commands achieve the same effect: they remove the SQL in the memory buffer of SQL*Plus. The CLEAR COLUMNS and the CLEAR BREAKS commands remove any column definitions and breaks. The CLEAR TIMING command deactivates all timers. You use the CLEAR SCR (or CLEAR SCREEN) command to clear the screen.
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STORE Command
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During a given SQL*Plus session, it s likely that you ll need to change your environment settings in order to run a specific SQL script or command. If you want to preserve these settings for future use, you can do so with the help of the STORE command. Once you store the values in a script, you can run
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that script anytime to restore the original values of all variables. Thus, if you run a report that requires changing some variable values, just run the script that contains the original values after you finish the report to restore the original values of the variables. The following example shows how to use the STORE command to save your SQL*Plus environment settings: SQL> STORE SET mysqlplus.sql Created file mysqlplus.sql SQL> Executing the previous command will result in the storing of all the current environmental values in the file named sqlplus.sql. Once you store your favorite environment variables in a file, you can easily reuse them anytime you want by simply executing the script. (I explain the execution of SQL scripts in the following sections.) In order to restore the stored values of all system variables, enter SQL> START mysqlplus.sql If you wish, you can just enter @mysqlplus.sql or @@mysqlplus.sql to run the script. You can also add the script to the user profile script so each time you start SQL*Plus, all variables will have the desired values. The STORE command can be used with three options: CREATE, REPLACE, or APPEND. The default is CREATE, which creates a new file. If you wish to replace an existing file and store your SQL*Plus commands there, use the REPLACE option. If you wish to add the commands to an existing file, use the APPEND option.
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SHOW Command
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You can use the SHOW command to display variable values. To find out the individual values, you type in the specific variable s name, as shown in the following example: SQL> SHOW TTITLE ttitle ON and is the following 49 characters: Annual Financial Report for the Women's Club, 2005 SQL> The SHOW ALL command will show you the current settings for all the SQL*Plus environment variables. I briefly explain some of the most important options for the SHOW command in the following sections.
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SHOW RECYCLEBIN Command
One of the most useful SQL*Plus commands is the SHOW RECYCLEBIN command. This command will let you see if there are any tables that are eligible for a recovery using the FLASHBACK TO BEFORE DROP command. If you drop a table, that table doesn t go away immediately it stays in the Recycle Bin until you either get rid of it permanently with the DROP TABLE PURGE command or the database faces space pressure. I discuss the Flashback Table feature in detail in 8, but here s what you ll see if there is an eligible table stored in the Recycle Bin: SQL> CREATE TABLE test (name varchar2(30)); Table created. SQL> DROP TABLE test; Table dropped. SQL> SHOW RECYCLEBIN
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