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ou can connect to and work with Oracle databases in many ways. Chances are, though, that you ll spend a lot of time using the Oracle SQL*Plus interface and a set of commands known as SQL*Plus commands. The SQL*Plus interface provides you with a window into the Oracle database, and Oracle developers use the interface extensively to create SQL and PL/SQL program units. The interface is a valuable tool for Oracle DBAs for several reasons: You can use it to run SQL queries and PL/SQL (Oracle s procedural language extension to SQL) code blocks and to receive the results. You can issue DBA commands and automate jobs. It enables you to start up and shut down the database. It provides you with a convenient way to create database administration reports. This chapter covers the use of SQL*Plus to perform typical database administration tasks, and you ll get a chance to learn the important SQL*Plus commands, if you aren t already familiar with them. There is also a brief discussion of building reports using SQL*Plus. Although you probably won t use the SQL*Plus interface to produce a lot of reports, it s nice to know how to work with its many report-building features.
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SQL*Plus is the utility most commonly used to connect to and work with an Oracle database. SQL*Plus is included with your Oracle Database 11g server software, and the Oracle Client software also contains the SQL*Plus executables. You can also use the new Oracle Instant Client (discussed in 11) to connect to a database using SQL*Plus. Once you ascertain that the SQL*Plus software is installed on your server or client machine, it s a straightforward process to log into the server or client and start a SQL*Plus session. Since every SQL*Plus session involves a connection with a database (unless it s a NOLOG connection, as explained in the Connectionless SQL*Plus Session with /NOLOG section of this chapter), all you ll need is a valid username/password combination to start a SQL*Plus session and connect to a database.
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Before you can invoke SQL*Plus, you must first set your Oracle environment correctly. You must set the ORACLE_SID, ORACLE_HOME, and LD_LIBRARY_PATH environment variables. In addition, sometimes you may have to set the NLS_LANG and ORA_NLS11 environment variables as well. If you don t have the correct environment variables set, you ll see an error. For example, not setting the ORACLE_HOME variable correctly before starting SQL*Plus will lead to the following error: $ sqlplus Error 6 initializing SQL*Plus Message file sp1<lang>.msb not found SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory If you get the preceding error, simply set the value of the ORACLE_HOME environment variable, as shown here: $ export ORACLE_HOME= /u01/app/oracle/product/11.1.0/db_1
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You don t always have to install the entire Oracle Database server software in order to use SQL*Plus. If you just want to interact with an Oracle database that s running on a different server through the SQL*Plus interface, all you need is the SQL*Plus Instant Client. Using this software, you can remotely connect to any Oracle database running on any type of operating system platform. You simply specify the name of the remote database using an Oracle net connection identifier. The only requirement for connecting to a remote database is to specify the remote database in your tnsnames.ora file. That s why you must specify the ORACLE_HOME environment variable for the SQL*Plus Instant Client. There is also a method to connect that doesn t require you to ever use the tnsnames.ora file on the client server. This method is called the easy connect method. Using an easy connection identifier, you can connect as a user OE to the database testdb running on the server named myserver by using the following command: $ sqlplus oe/oe@//myserver.mydomain:1521/testdb In this example, 1521 is the port being used by the listener for incoming connections. 11 explains all the connection methods in detail.
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