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Incorporating Comments with the REMARK Command
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The REMARK command is straightforward. It enables you to incorporate comments in your SQL scripts. Here it s shortened to REM. SQL> GET user_report.sql 1 REM This script gives you the usernames and their profiles 2 REM Author: sam alapati 3 REM Date: JUNE 20,2005 4 SELECT username, profile FROM dba_users; SQL>
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Copying Tables with the COPY Command
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On large tables, you tend to get into trouble using the CREATE TABLE AS SELECT (CTAS) technique because Oracle does not commit between the inserts, and in the meantime, the undo segments may run out of space. You are also limited to non-LONG data types when you use this technique. By using the COPY command, you can copy data from a query into a table in the same or a remote database. The COPY command gives you a way to easily copy all types of tables, and it avoids many of the problems of using the CTAS technique, because it does commit while it s copying the data from the source table. Here s the syntax of the SQL COPY command: SQL> COPY usage: COPY FROM <db> TO <db> <opt> <table> { (<cols>) } USING <sel> <db> : database string, e.g., hr/your_password@d:chicago-mktg <opt> : ONE of the keywords: APPEND, CREATE, INSERT or REPLACE <table>: name of the destination table <cols> : a comma-separated list of destination column aliases <sel> : any valid SQL SELECT statement SQL>
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CH APT ER 4 US ING SQ L*PLUS AN D O RA CLE E NTE RPR IS E MA NAGE R
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If the FROM or TO clause is missing, the current SQL*Plus connection is used. The key parameter is opt, which lets you specify one of the following: APPEND: Inserts records into the target table and creates the table if it doesn t exist CREATE: Creates the target table and inserts rows into it INSERT: Inserts rows into an existing table REPLACE: Drops the existing table, re-creates it, and loads data into it The USING <sel> clause lets you specify the query that determines the rows and columns you want to copy from the target table.
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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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Listing 4-19 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 4-19. 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 DML statements either separately or as part of a named or an 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 results in an automatic COMMIT statement being appended to every SQL statement you issue in that session.
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