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You can issue a DDL command, such as DROP INDEX, that will also automatically ensure that any pending transaction is followed with either a COMMIT or ROLLBACK statement. You can exit gracefully from SQL*Plus by typing in EXIT or QUIT, which are identical in their effects. When you issue the EXIT command, Oracle will automatically commit all changes you made in that session, even if you never issued a commit request, or even if the AUTOCOMMIT setting has been set to OFF. When you use either the EXIT or QUIT command, the following will happen: All pending changes are rolled back or committed. The user is logged out of Oracle. The SQL*Plus session is terminated. Control is returned to the operating system.
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When you embed SQL*Plus in program scripts, you can use the MARKUP command in the following way to produce HTML output: SQLPLUS -MARKUP "HTML ON" Before executing any SQL commands, this command outputs the HTML and BODY tags. If you want to output an HTML page that can be embedded in an existing web page, you can use the MARKUP command as follows: SQL> SET MARKUP HTML ON SPOOL ON SQL> commands here . . . SQL> SET MARKUP HTML OFF SPOOL OFF
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Key SQL*Plus Database Administration Commands
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Although you may use every SQL*Plus command in the course of database administration, some specific commands in SQL*Plus exist for the sole use of the Oracle DBA. There are four powerful database administration commands that you can use from SQL*Plus the RECOVER command, the STARTUP and SHUTDOWN commands, and the ARCHIVE LOG command.
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RECOVER Command
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The RECOVER command, as you can imagine, is used to recover a database or one of its files or tablespaces after a database failure. To be able to run this command, you need to have the OSOPER or the OSDBA role. You can perform manual or automatic recovery, and in either case, you re responsible for first restoring all the necessary datafiles so you can recover your database. The RECOVER command is complex and critical, and you ll examine it in great detail in 16, which deals with database recovery.
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STARTUP and SHUTDOWN Commands
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The STARTUP and SHUTDOWN commands are used to start up and shut down your Oracle instance. For details about both of these commands, see 10.
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ARCHIVE LOG Command
Archive logs are the archived or stored redo logs, and they play a critical role in database recovery. Any user with the OSDBA or OSOPER privilege can issue the ARCHIVE LOG command. It enables you to start and stop the archiving of redo log files, as shown here: SQL> ARCHIVE LOG START Statement processed. SQL> ARCHIVE LOG STOP Statement processed. SQL> You can use the ARCHIVE LOG LIST command to view details about the archive logs being archived, as shown here: SQL> ARCHIVE LOG LIST Database log mode Automatic archival Archive destination Oldest online log sequence Next log sequence to archive Current log sequence SQL> Archive Mode Enabled /a03/app/oracle/admin/NICKO/arch/ 933 937 937
The preceding command shows that the database is in the archive mode and also that automatic archiving is enabled.
Using SQL to Generate SQL
There will be occasions when you have to write a SQL script that involves a number of similar lines. A good example would be a script in which you are assigning a set of privileges to several users. You can, of course, execute separate SQL statements for each user, but it is a waste of time to do so, besides being a mind-numbing exercise. Fortunately, you can use SQL to generate a script with all the SQL statements that need to be executed. Using SQL to generate SQL essentially involves using the output of one SQL statement as input for another SQL statement. It is very easy to write SQL code that generates more SQL code as output. First, you write the SQL to generate the SQL. Next, you start spooling a file, where the output of the first SQL script will be captured. Then you execute the SQL code that will actually generate SQL code as its output. The spooled script will contain the final set of commands you are interested in. Finally, you execute this spooled script that contains the generated SQL code.
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