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Please click the link in the confirmation email to activate your subscription. Therefore, to ensure that the exception is logged, the following "pseudo-approach" is taken by many developers (note that in the simple examples that follow I've substituted DBMS_OUTPUT.PUT_LINE for an application logging Let's call p3: SQL> set serveroutput on SQL> BEGIN 2 DBMS_OUTPUT.put_line ('calling p3'); 3 p3; 4 END; 5 / calling p3 in p3, calling p2 in p2 calling p1 in p1, In other words, this function answers the question, “How did I get here?” Listing 1 demonstrates the DBMS_UTILITY.FORMAT_CALL_STACK function and what the formatted string looks like.

SET SERVEROUTPUT ON EXEC test_pkg.proc_1; ***** Call Stack Start ***** Depth Lexical Line Owner Edition Name . With these locations established, I can now use SUBSTR to extract the desired portions and assign them to the fields in my record to be returned to the calling program, as The quiz demonstrated the new DBMS_SQL .return_result procedure, and all three choices were correct! Reliance on SQLERRM means some information could be lost.

Depth Number'); DBMS_OUTPUT.put_line('--------- --------- --------- --------- --------- --------------------'); FOR i IN 1 .. Code Message --------- --------- -------------------- 5 ORA-01403 no data found 4 ORA-06512 at "TEST.TEST_PKG", line 24 3 ORA-01422 exact fetch returns more than requested number of rows 2 ORA-06512 at "TEST.TEST_PKG", The format_call_stack_12c procedure in Listing 2 does precisely this. Lexical unit information is not exposed through UTL_CALL_STACK.

Syntax DBMS_UTILITY.FORMAT_ERROR_BACKTRACE RETURN VARCHAR2; Return Values The backtrace string. For example, using the bt.info function, the exception section of proc3 now looks like the procedure in Listing 4. They might, for example, take screen scrapes of their scheduling systems' output as application logs and be satisfied with the level of information demonstrated above. The result was exactly the same as in case3 - everything was stored except 'bad' rows.

On the other hand, we got this information by letting the exception go unhandled. Andy Todd | 25 Jul 2006 9:47 pm I've always found the line numbers provided by the PL/SQL parser to be a little misleading, whenever I've tried to look them up Problematic Code This block of code executes dynamic SQL and includes an exception to display information when an error occurs. At the level of the SQL*Plus prompt, every update/insert/delete has one implicit savepoint, and also the invocation of any unnamed block.

DBMS_UTILITY.CURRENT_INSTANCE DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE DBMS_UTILITY.DB_VERSION DBMS_UTILITY.EXEC_DDL_STATEMENT DBMS_UTILITY.FORMAT_CALL_STACK DBMS_UTILITY.FORMAT_ERROR_BACKTRACE DBMS_UTILITY.FORMAT_ERROR_STACK DBMS_UTILITY.GET_CPU_TIME DBMS_UTILITY.GET_DEPENDENCY DBMS_UTILITY.GET_HASH_VALUE DBMS_UTILITY.GET_PARAMETER_VALUE DBMS_UTILITY.GET_TIME DBMS_UTILITY.INVALIDATE DBMS_UTILITY.IS_CLUSTER_DATABASE DBMS_UTILITY.IS_PARALLEL_SERVER DBMS_UTILITY.MAKE_DATA_BLOCK_ADDRESS DBMS_UTILITY.NAME_RESOLVE DBMS_UTILITY.NAME_TOKENIZE DBMS_UTILITY.PORT_STRING DBMS_UTILITY.TABLE_TO_COMMA DBMS_UTILITY.VALIDATE DBMS_WORKLOAD_CAPTURE DBMS_WORKLOAD_REPLAY DBMS_WORKLOAD_REPOSITORY DBMS_XPLN UTL_FILE UTL_HTTP UTL_RAW UTL_REF Keyword Although the package name sounds as though it only provides information about the execution call stack, it also offers access to the error stack and error backtrace data. SQL> BEGIN 2 will_error(); 3 EXCEPTION 4 WHEN OTHERS THEN 5 DBMS_OUTPUT.PUT_LINE( SQLERRM ); 6 DBMS_OUTPUT.PUT_LINE( DBMS_UTILITY.FORMAT_ERROR_BACKTRACE ); 7 END; 8 / ORA-06501: PL/SQL: program error ORA-06512: at "SCOTT.WILL_ERROR", line 3 l_depth LOOP DBMS_OUTPUT.put_line( RPAD(i, 10) || RPAD('ORA-' || LPAD(UTL_CALL_STACK.error_number(i), 5, '0'), 10) || UTL_CALL_STACK.error_msg(i) ); END LOOP; DBMS_OUTPUT.put_line('***** Error Stack End *****'); END; / -- Run the test.

DBMS_UTILITY.FORMAT_CALL_STACK3. The basic task is to parse a string with this format: ORA-NNNNN: at "OWNER.PROGRAM_NAME", line NNN Here are the steps I took: 1. Answer to Previous Challenge The PL/SQL Challenge question in last issue’s “SQL in PL/SQL Enhancements” article focused on enhancements for executing SQL from PL/SQL in Oracle Database 12c. These processing packages will each contain a call to the new DBMS_UTILITY.FORMAT_ERROR_BACKTRACE function to enable them to log the precise origins and propagation path of an exception.

In my mind it is fairly clear that the various utility packages I include in my overall application will not handle unexpected exceptions in any way. This means that you no longer have to parse the formatted strings to find the specific information you need. When an exception is raised, one of the most important pieces of information a programmer would like to uncover is the line of code that raised the exception. The long awaited Oracle enhancement to solve this problem was introduced in the first release of 10g.

dbms_output.put('Complete Call Stack:'); dbms_output.put(' Object Handle Line Number Object Name'); dbms_output.put_line(' ------------- ----------- -----------'); FOR v_CallRec in c_CallCur LOOP dbms_output.put(RPAD(' ' || v_CallRec.object_handle, 15)); dbms_output.put(RPAD(' I then use the format_call_stack_12c procedure (in Listing 2) in the pkg.do_stuff procedure and execute that procedure, as shown in Listing 3. SQL> There is very little you can do with the backtrace, other than reordering it. Not the answer you're looking for?

In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms Consider this simple chain of program calls in Listing 1: procedure proc3 calls proc2 calls proc1 , at which point proc1 raises the NO_DATA_FOUND exception. It gives the error line number and the complete call stack throgh the procedure names. Avoid exception handlers in intermediate programs in your stack, and call the backtrace function in the exception section of the outermost program in your stack.

BACKTRACE_UNIT : Subprogram name associated with the current call. This means that if you want to take advantage of DBMS_UTILITY.FORMAT_ERROR_BACKTRACE , take one of the following two approaches: Call the backtrace function in the exception section of the block in DBMS_UTILITY.FORMAT_ERROR_STACK. DBMS_UTILITY.FORMAT_CALL_STACK.

SQL> You now have programmatic control to interrogate and display the call stack if you need to. In previous releases this information was displayed using the DBMS_UTILITY.FORMAT_ERROR_BACKTRACE function, as shown below. -- Procedure to display the call stack. Take the Challenge Each Oracle Magazine PL/SQL article by Steven Feuerstein offers a quiz to test your knowledge of the information provided in it. Error Stack Exceptions are often handled by exception handlers and re-raised.

If Dumbledore is the most powerful wizard (allegedly), why would he work at a glorified boarding school? SQL> CREATE PROCEDURE will_error AS 2 BEGIN 3 RAISE PROGRAM_ERROR; 4 END; 5 / Procedure created. Listing 3 shows an example of such an occurrence. Start with the index at the beginning of the string *; v_Index := 1; /* Loop through the string, finding each newline A newline ends

A NULL string is returned if no error is currently being handled. Code Listing 2: proc3 rewritten with FORMAT_ERROR_BACKTRACE CREATE OR REPLACE PROCEDURE proc3 IS BEGIN DBMS_OUTPUT.put_line ('calling proc2'); proc2; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.put_line ('Error stack at top level:'); my_putline (DBMS_UTILITY.FORMAT_ERROR_BACKTRACE); END; Having upgraded to Oracle Database 10g, I can now revisit my proc3 procedure and replace the call to FORMAT_ERROR_STACK with FORMAT_ERROR_BACKTRACE , as shown in Listing 2. Email check failed, please try again Sorry, your blog cannot share posts by email.

The following example recreates the DISPLAY_ERROR_STACK procedure to use the UTL_CALL_STACK package, then re-runs the test. -- Procedure to display the call stack. Thus, you can call DBMS_UTILITY.FORMAT_ERROR_BACKTRACE within an exception section at the top level of your stack and still find out where the error was raised deep within the call stack.