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format error backtrace oracle Prague, Oklahoma

Code Listing 4: The backtrace_to function calls UTL_CALL_STACK subprograms SQL> CREATE OR REPLACE FUNCTION backtrace_to 2 RETURN VARCHAR2 3 IS 4 BEGIN 5 RETURN 6 utl_call_stack.backtrace_unit ( 7 utl_call_stack.error_depth) 8 || ERROR_NUMBER : The error number associated with the current line in the error stack. Code Listing 3: The pkg.do_stuff procedure calls the format_call_stack_12c procedure SQL> CREATE OR REPLACE PACKAGE pkg 2 IS 3 PROCEDURE do_stuff; 4 END; 5 / SQL> CREATE OR REPLACE PACKAGE BODY SQL> You now have programmatic control to interrogate and display the call stack if you need to.

Having compiled the new proc3 , when I run it inside SQL*Plus I see the following output: SQL> SET SERVEROUTPUT ON SQL> exec proc3 calling proc2 calling proc1 running proc1 ORA-01403: If you want that exception to propagate all the way to the outermost PL/SQL block, it will have to be re-raised within each exception handler in the stack of blocks. ERROR_DEPTH : The number of errors on the error stack. Code Message --------- --------- -------------------- 1 ORA-00001 unique constraint (.) violated 2 ORA-06512 at "TEST.TEST_PKG", line 16 3 ORA-01422 exact fetch returns more than requested number of rows 4 ORA-06512 at

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 Welcome Account Sign Out Sign In/Register Help Products Solutions Downloads Store Support Training Partners About OTN Oracle Technology Network testcontent As Published In March/April 2005 TECHNOLOGY: PL/SQL Tracing Lines By Steven If Dumbledore is the most powerful wizard (allegedly), why would he work at a glorified boarding school? CONCATENATE_SUBPROGRAM then obtains the fully qualified name of that subprogram.

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. Line Unit'); DBMS_OUTPUT.put_line('--------- --------- --------------------'); FOR i IN REVERSE 1 .. Therefore, an important distinction needs to be made between application code that needs to be logged and that which doesn't. SET SERVEROUTPUT ON EXEC test_pkg.proc_1; ***** Call Stack Start ***** Depth Lexical Line Owner Edition Name .

The output is similar to the output of the SQLERRM function, but not subject to the same size limitation. CREATE OR REPLACE PROCEDURE display_call_stack AS l_depth PLS_INTEGER; BEGIN l_depth := UTL_CALL_STACK.dynamic_depth; DBMS_OUTPUT.put_line('***** Call Stack Start *****'); DBMS_OUTPUT.put_line('Depth Lexical Line Owner Edition Name'); DBMS_OUTPUT.put_line('. The thoughts expressed here are mine. Call Stack Error Stack Backtrace Call Stack The call stack allows you to identify exactly where you are in the currently running code, which includes information about nesting of subprogram calls.

This has been the cause of many a frustration for developers. It will aid greatly in resolving the cause of the error. The following simple PL/SQL block demonstrates that Oracle will happily tell us where a procedure, function or anonymous block hit an exception. Lama | 13 Jan 2008 3:00 pm DECLARE CURR_CONS CONSULTANT%ROWTYPE BEGIN SELECT * INTO CURR_CONS FROM CONSULTANT END; / -find the error please Recent Articles Oracle Database 12c: Interactive Quick Reference

If I run proc3 in SQL*Plus, I will see the following results: ERROR at line 1: ORA-01403: no data found ORA-06512: at "SCOTT.PROC1", line 4 ORA-06512: at "SCOTT.PROC2", line 6 ORA-06512: Code Listing 2: The format_call_stack_12c procedure calls UTL_CALL_STACK subprograms SQL> CREATE OR REPLACE PROCEDURE format_call_stack_12c 2 IS 3 BEGIN 4 DBMS_OUTPUT.put_line ( 5 'LexDepth Depth LineNo Name'); 6 DBMS_OUTPUT.put_line ( 7 Or you may need to contact your application administrator or database administrator. */ Glossary 14399 0 / First published by Steve Hilker When: 12 Mar 2013 10:13 PM Last revision by There is, however, always room for improvement, and that is why Oracle Database 12c added UTL_CALL_STACK.

SQL> CREATE OR REPLACE PROCEDURE p3 2 IS 3 BEGIN 4 DBMS_OUTPUT.put_line ('in p3, calling p2'); 5 p2; 6 EXCEPTION 7 WHEN OTHERS 8 THEN 9 DBMS_OUTPUT.put_line ('Error stack from p3:'); it would be useful to get the current procedure name at the moment the Exception happened or is catched. The question is how to find that line number. SQL> CREATE OR REPLACE PROCEDURE p2 2 IS 3 BEGIN 4 DBMS_OUTPUT.put_line ('in p2'); 5 DBMS_OUTPUT.put_line ('calling p1'); 6 p1; 7 EXCEPTION 8 WHEN OTHERS 9 THEN 10 RAISE NO_DATA_FOUND; 11

I will continue to use my_putline , since the backtrace could be very long if the call stack is deep (and your program names are long). SQL> The output from DBMS_UTILITY.FORMAT_ERROR_STACK function is fine, but there are occasional formatting errors and we can't order the output to suit our taste. 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. Code Listing 4: Revised proc3 calling bt.info CREATE OR REPLACE PROCEDURE proc3 IS BEGIN DBMS_OUTPUT.put_line ('calling proc2'); proc2; EXCEPTION WHEN OTHERS THEN DECLARE l_trace bt.error_rt; BEGIN l_trace := bt.info (DBMS_UTILITY.format_error_backtrace); raise_application_error

Not the answer you're looking for? This additional information is not available, however, for the error backtrace. I create a package specification: CREATE OR REPLACE PACKAGE plch_pkg IS PROCEDURE proc1; END plch_pkg; / Which of the choices create a body for this package so that after the following Another approach is to call the function in the exception section of the block in which the error was raised.

Finally, with the release of 10g, Oracle has added provision for PL/SQL developers to trap AND log exceptions accurately for the first time. turn translation off Search Clear Search Options Search Everything Search Oracle |LOGIN |REGISTER TRAININGToad Courseware Academic Program Training Courses DOWNLOADSFreewares & Trials PLATFORMSDatabase Blogs & Wikis IBM DB2 MySQL NoSQL SET SERVEROUTPUT ON EXEC test_pkg.proc_1; ***** Error Stack Start ***** Depth Error Error . This is only a replacement for the existing functionality if you need the extra level of control.

This shows the propagation of the exception, which allows you to identify the actual line that caused the problem. The UTL_CALL_STACK package recognizes the importance of this data and takes a big step forward in giving PL/SQL developers access to more in-depth and useful information. With UTL_CALL_STACK there is no longer any need to parse the complete backtrace string, as would be necessary with DBMS_UTILITY.FORMAT_ERROR_BACKTRACE. This is not hard to do, but it’s more code that you have to write and maintain.

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. Call Stacks, Error Stacks, and Error Backtraces Prior to Oracle Database 12c, Oracle Database offered several DBMS_UTILITY functions to answer key questions programmers ask as they develop, debug, and maintain their I then re-raise the same exception using the RAISE statement. Steven Feuerstein ([email protected]) is an authority on the PL/SQL language.

The quiz appears below and also at the PL/SQL Challenge (plsqlchallenge.com), a website that offers online quizzes on the PL/SQL language as well as SQL, Oracle Application Express, database design, and The existing functionality in the DBMS_UTILITY package is still available and has not been deprecated. Notice that there is no error handling in any of the procedures; it is most significantly lacking in the top-level proc3 procedure. Action: Fix the problem causing the exception or write an exception handler for this condition.

DYNAMIC_DEPTH : The number of subprograms on the call stack, starting at the current position in the call stack, to the initial call. Listing 3 shows an example of such an occurrence.