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Running the OUI
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Oracle products are shipped on CDs or DVDs, or can be downloaded from Oracle Corporation s Web site The installation can be done directly from the CD or DVD, but it us usually better to copy the CD or DVD to disk first, and install from there This does save time The downloaded versions are usually ZIP files, or for Linux and Unix compressed TAR or CPIO files Use whatever operating system utility is appropriate to expand them To launch the OUI, on Windows run the setupexe file in the root of the CD or DVD, on Linux and Unix, run the runInstaller shell script
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Database Creation and Upgrade Tools
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The DBCA, the Database Configuration Assistant, is a graphical tool for creating a database It is fully described in 4 Creating a database is not a big deal You can create twenty databases during a tea break if you have the scripts ready written
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Preparing the Database Environment
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DBCA generates and runs such scripts, and it makes sure that there are no silly mistakes But it doesn t do anything that couldn t be done from a command-line utility DBCA can be launched by OUI First OUI instantiates the Oracle Home, and then it goes on to run DBCA As with database creation, database upgrade can be done manually or through a graphical tool The graphical tool is the DBUA, the Database Upgrade Assistant It, too, can be called by OUI, if OUI detects an existing database Oracle Home of an earlier version The DBUA will ensure that no steps are missed, but many DBAs prefer to do upgrades manually They believe that it gives them more control, and in some cases a manual upgrade can be quicker Both DBCA and DBUA are written in Java and therefore require a graphics terminal to display
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Tools for Issuing Ad Hoc SQL: SQL*Plus and SQL Developer
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There are numerous tools that can be used to connect to an Oracle database Two of the most basic are SQL*Plus and SQL Developer These are provided by Oracle Corporation and are perfectly adequate for much of the work that a database administrator needs to do The choice between them is partly a matter of personal preference, partly to do with the environment, and partly to do with functionality SQL Developer undoubtedly offers far more function that SQL*Plus, but it is more demanding in that it needs a graphical terminal, whereas SQL*Plus can be used on character mode devices The iSQL*Plus product that was much trumpeted with database release 9i has now fallen into disuse and is no longer shipped with release 11g Some old DBAs (who have often been skeptical about the value of graphical tools) predicted this and are using it as an excuse for ignoring SQL DeveloperThis is not a productive attitude
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SQL*Plus
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SQL*Plus is available on all platforms to which the database has been ported, installed into both Oracle database and Oracle client Oracle Homes On Linux, the executable file is sqlplus The location of this file will be installation specific but will typically be something like
/u01/app/oracle/product/db_1/bin/sqlplus
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Your Linux account should be set up appropriately to run SQL*Plus There are some environment variables that will need to be set These are
ORACLE_HOME PATH LD_LIBRARY_PATH
The PATH must include the bin directory in the Oracle Home The LD_ LIBRARY_PATH should include the lib directory in the Oracle Home, but in practice you may get away without setting this Figure 3-1 shows a Linux terminal window and some tests to see if the environment is correct In Figure 3-1, first the echo command checks whether the three variables have been set up correctly: there is an ORACLE_HOME, and the bin and lib directories in it have been set as the first elements of the PATH and LD_LIBRARY_ PATH variables Then which confirms that the SQL*Plus executable file really is available, in the PATH Finally, SQL*Plus is launched with a username, a password, and a connect identifier passed to it on the command line Following the logon, the next lines of text display the version of SQL*Plus being used, which is 111060 and the version of the database to which the connection has been made (which happens to be the same as the version of the SQL*Plus tool) and which options have been installed within the database The last line is the prompt to the user, SQL>, at which point he/she can enter any SQL*Plus or SQL command
FIGURE 3-1
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