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Historically, there were always two versions of SQL*Plus for Microsoft Windows: the character version and the graphical version The character version is the executable file sqlplusexe, the graphical version was sqlpluswexe; with the current release the graphical version no longer exists, but many DBAs will prefer to use it, and the versions shipped with earlier releases are perfectly good tools for working with an 11g database There are no problems with mixing versions: an 11g SQL*Plus client can connect to a 9i database, and a 9i SQL*Plus client can connect to an 11g database; changes in Oracle Net may make it impossible to go back further than 9i Following a default installation of either the Oracle database or just the Oracle client on Windows, SQL*Plus will be available as a shortcut on the Windows Start menu The tests of the environment and the need to set the variables if they are not correct, previously described for a Linux installation, are not usually necessary on a Windows installation This is because the variables are set in the Windows registry by the Oracle Universal Installer when the software is installed If SQL*Plus does not launch successfully, check the registry variables Figure 3-2 shows the relevant section of the registry, viewed with the Windows regeditexe registry editor utility Within the registry editor, navigate to the key
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The final element of this navigation path will have a different name if there have been several 11g installations on the machine
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SQL Developer is a tool for connecting to an Oracle database (or, in fact, some non-Oracle databases too) and issuing ad hoc SQL commands It can also manage PL/SQL objects Unlike SQL*Plus, it is a graphical tool with wizards for commonly needed actions SQL Developer is written in Java, and requires a Java Runtime Environment (a JRE) to run Being written in Java, SQL Developer is available on all platforms that support the appropriate version of the Java Runtime Environment (the JRE) There are no significant differences between platforms SQL Developer need not be installed with the Oracle Universal Installer, which is used to install most other Oracle products It does not exist in an Oracle Home but is a completely self-contained product The latest version can be downloaded from Oracle Corporation s Web site To install SQL Developer, unzip the ZIP file That s all It does require JDK15, the Java Runtime Environment release 15, to be available: this comes from Sun Microsystems But if JDK15 (or a later release) is not already available on the machine being used, there are downloadable versions of SQL Developer for Windows that include it For platforms other than Windows, the JDK15 must be preinstalled Download it from Sun Microsystem s Web site, and install it according to the platform-specific directions To check that the JDK is available and the version, from an operating system prompt run the command
java version
This should return something like
java version "150_13" Java(TM) 2 Runtime Environment, Standard Edition (build 150_13-b05) Java HotSpot(TM) Client VM (build 150_13-b05, mixed mode, sharing)
If it does not, using which java may help identify the problem: the search path could be locating an incorrect version Once SQL Developer has been unzipped, change your current directory to the directory in which SQL Developer was unzipped, and launch it On Windows, the executable file is sqldeveloperexe On Linux, it is the sqldevelopersh shell script Remember to check that the DISPLAY environment variable has been set to a suitable value (such as127001:00, if SQL Developer is being run on the system console) before running the shell script
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Any problems with installing the JRE and launching SQL Developer should be referred to your system administrator Database 11g does ship with a release of SQL Developer, and OUI will unzip it into a directory in the Oracle Home, but this will not be the up-to-date version As of the time of writing, the version shipped with the production release of the 11g database is version 11, but the current version is 12 Figure 3-3 shows the SQL Developer user interface after connecting to a database and issuing a simple query The general layout of the SQL Developer window is a left pane for navigation around objects, and a right pane to display and enter information In the figure, the left-hand pane shows that a connection has been made to a database The connection is called orcl_sys This name is just a label chosen when the connection was defined, but most developers will use some sort of naming convention in this case, the name chosen is the database identifier, which is orcl, and the name of the user the connection was made as, which was sys The branches beneath list all the possible object types that can be managed Expanding the
FIGURE 3-3
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