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Debugging with TOAD for Oracle
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TOAD for Oracle is a very popular SQL and PL/SQL development tool by Quest Software. There s a freeware version available for download from Quest Software at http://www.toadsoft.com/ toad_oracle.htm. However, the free version does not include debugging capability. To get a copy of TOAD with a debugger, you must download the trial version. The TOAD debugger is currently not capable of debugging user-defined TYPEs. Other than that, it has almost the same set of debugging features as Oracle SQL Developer.
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Oracle has a plug-in module that allows you to use the remote debugger from Microsoft s Visual Studio. Once again, you can download this plug-in from Oracle s Technology Network web site at http://otn.oracle.com.
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It s Your Turn to Use a Debugger
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I know I haven t taken the time to show you how to use the PL/SQL debugger; I ve only walked through an example, As a professional, it will be invaluable for you to know how to use the PL/SQL debugger. So, follow these somewhat loosely defined steps to install the PL/SQL debugger and get some experience using it: 1. Go to http://otn.oracle.com and search for Oracle SQL Developer download. This should bring you to the Oracle SQL Developer page, where you can download a copy of the software, get its installation instructions, and access tutorials for using the product. 2. Download Oracle SQL Developer. 3. Print a copy of the tutorials Creating a database connection and Loading, executing and debugging PL/SQL. 4. Install Oracle SQL Developer. 5. Run Oracle SQL Developer and create a connection to the database you re using for working on your exercises. 6. Using the Loading, executing and debugging PL/SQL tutorial as your guide, find table package DEBUG_TS in the tree view. 7. Edit the package body by right-clicking its name in the tree view, and then recompile it with debug. 8. Create breakpoints in DEBUG_TS s three methods: disable(), enable(), and set_text(). 9. Edit the package specification, and click the ladybug icon to run the debugger. 10. When the Debug PL/SQL dialog box appears, click the From File button, and then load your test unit script: debug_ts.sql. 11. Remove the comment lines at the top of the test unit script and the trailing compile slash at the end of the script, and then click OK to start your debug session. 12. After the first breakpoint is triggered, click the Step Into icon to walk through the code line by line. 13. Add some watches so you can see the variable s values change as the program executes. 14. Sit back and think how helpful this tool can be in your future. At this point, you should now have three tools in your troubleshooting arsenal: put_line(), table package DEBUG_TS, and a real live debugger! With these tools, you should be able to troubleshoot any logic problem, but what about performance
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If you have a long-running or large stored procedure, how do you know where in its code it s slow You can get this information with runtime profiling, our next topic.
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Profiling in this context is about collecting runtime statistics from your PL/SQL program units in order to determine which lines of code are consuming the most resources, usually in a unit of time. Armed with these statistics, you can quickly see what part of your PL/SQL program is taking the most time to execute, so you can concentrate your efforts on improving performance on those lines of code that are poor performers. In days of yore, you had to write your own profiling package in order to collect runtime statistics. Then you had to sprinkle your code with calls to your profiling package in order to collect the statistics. In fact, I did just that, creating a profiling package with architecture similar to the debug logging package. Nowadays, you have access to a built-in profiling package, SYS.DBMS_PROFILER, which can hook itself into your session and profile your PL/SQL code line by line, without you needing to add many lines of code to your listings. Here, we ll look at the three tables where DBMS_PROFILER stores its collected statistics, the package s methods, and an example of its use. Then we ll finish up this section by having you profile your own code.
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