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If a table consists of a LONG column, you can t use the CTAS method to make a copy of the table. You can, however, use the COPY command to copy this table.
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CHAPTER 12 USING SQL*PLUS AND iSQL*PLUS
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Listing 12-19 shows how to use the COPY command. Note that the hyphen (-) is the continue character, and it lets you break up long SQL statements over multiple lines. Make sure you use the continue character and don t hit Enter after the first line! Listing 12-19. Using the COPY Command SQL> COPY FROM sysadm/sysadm1@finance1> CREATE test01 > USING SELECT * FROM employee; Array fetch/bind size is 15. (arraysize is 15) Will commit when done. (copycommit is 0) Maximum long size is 80. (long is 80) Table TEST01 created. 4954 rows selected from sysadm@finance1 4954 rows inserted into TEST01. 4954 rows committed into TEST01 at DEFAULT HOST connection. SQL> You can make the COPY command s execution faster by increasing the size of the SQL*Plus parameters ARRAYSIZE, COPYCOMMIT, and LONG, if necessary. Using the CREATE TABLE AS SELECT method is usually faster than using the COPY command when you re copying data from one table to another on the same server using the COPY command involves copying data from the server to the client SQL*Plus interface before copying it back to the database again. Obviously this will increase the overhead and take longer to process than directly copying from the server to the same server.
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Making DML Changes Permanent with SQL*Plus
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When you use SQL*Plus, you can enter data manipulation statements (DML) either separately or as part of a named or anonymous block of PL/SQL code. Here are the different ways in which DML changes are made permanent: You can commit the results of a transaction by using the COMMIT keyword at the end of the transaction. You can set the AUTOCOMMIT setting to ON in your SQL*Plus session, which will ensure that changes being made in the session are committed periodically on an automatic basis. You can issue a DDL command, such as DROP INDEX, that will also automatically commit all the transactions pending either a commit or a rollback within the session. 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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CHAPTER 12 USING SQL*PLUS AND iSQL*PLUS
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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. Previous editions of the Oracle database allowed you to run these commands in alternative DBA interfaces, such as the Server Manager utility, but the Server Manager is finally obsolete, and SQL*Plus is now the only interface for all manual commands for administering databases. 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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