Ora Error Stack
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Dbms_utility.format_error_backtrace Example In Oracle
DBA's Useful Metalink Articles About Us Contact ERRORSTACK- Oracle Debugging Event Amit Bansal / 17 April, how to find which line error was raised in oracle 2008 One more post arising out of my frequent visits to Oracle forum 😉 Basically there was a question on "How to set oradebug dump errorstack 3 events for ORA - 1652 errors" I had replied to the post but Aman asked me if I could provide any notes regarding Errorstack.I didn't had one so I informed him that I will be posting on my blog
Pl Sql Call Stack
( Cheap Publicity of my blog 🙂 ) Ok, this was the background to it, now coming to the main thing. Errorstack is used as debugging event for following reasons To extract Failing SQL statement To get Oracle Function call (to be used by Oracle) for interpreting cause for the error (e.g ORA 4030, ORA- 4031). It is also used in case of database hang scenarios. Refer to my earlier article on database hang It also contains execution
Oracle Call Stack Trace
plan in some cases which can be used to diagnose ORA - 1652 errors (Excessive temp usage) Errorstack can be set at System level and also at Session level. e.g To set errorstack for ORA - 1652 ,Syntax will be alter system set events '1652 trace name errorstack level 3'; If suppose, you want to set it at session level, then alter session set events '1652 trace name errorstack level 3'; You can also use oradebug to take errorstack for particular process (say ospid 1234) as below sqlplus "/ as sysdba" oradebug setospid 1234 oradebug unlimit oradebug dump errorstack 3 There are different levels for the errorstack with level 3 being the highest. Note: There is no such level as level 10 or 12 which you might sometimes find on web. e.g event='1401 trace name errorstack, level 12' Extracted from http://www.orafaq.com/faqdbain.htm . Specifying this will default to level 3. Let's see one trace file for error ORA - 942 i.e "table or view does not exist" SYS>alter session set events '942 trace name errorstack level 3'; Session altered. SYS>select * from err; select * from err *ERROR at line 1:ORA-00942: table or view does not exist Trace file is generated in user_dump_dest as a user process has failed. Trace file Header /u01/app/oracle/admin/sql10g/udump/sql10g_ora_23773.trc Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production With the Partitioning, OLAP and Data Mining options ORACLE_HOME = /u01
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Alter System Set Events Errorstack
Information About the Currently Running Subprogram in Oracle Database 12c Release 1 (12.1) Oracle database 12c introduced the UTL_CALL_STACK utl_call_stack package to allow programmatic access to the call stack and error stack, giving much greater flexibility for debugging and error handling of PL/SQL code. This is only a replacement for the http://askdba.org/weblog/2008/04/errorstack-oracle-debugging-event/ existing functionality if you need the extra level of control. The existing functionality in the DBMS_UTILITY package is still available and has not been deprecated. 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. In previous releases this information was displayed https://oracle-base.com/articles/12c/utl-call-stack-12cr1 using the DBMS_UTILITY.FORMAT_CALL_STACK function, as shown below. -- Procedure to display the call stack. CREATE OR REPLACE PROCEDURE display_call_stack AS BEGIN DBMS_OUTPUT.put_line('***** Call Stack Start *****'); DBMS_OUTPUT.put_line(DBMS_UTILITY.format_call_stack); DBMS_OUTPUT.put_line('***** Call Stack End *****'); END; / -- Test package to show a nested call. CREATE OR REPLACE PACKAGE test_pkg AS PROCEDURE proc_1; PROCEDURE proc_2; PROCEDURE proc_3; END; / CREATE OR REPLACE PACKAGE BODY test_pkg AS PROCEDURE proc_1 AS BEGIN proc_2; END; PROCEDURE proc_2 AS BEGIN proc_3; END; PROCEDURE proc_3 AS BEGIN display_call_stack; END; END; / -- Run the test. SET SERVEROUTPUT ON EXEC test_pkg.proc_1; ***** Call Stack Start ***** ----- PL/SQL Call Stack ----- object line object handle number name 0xb6d4ac18 4 procedure TEST.DISPLAY_CALL_STACK 0xb6d14298 15 package body TEST.TEST_PKG 0xb6d14298 10 package body TEST.TEST_PKG 0xb6d14298 5 package body TEST.TEST_PKG 0xb99fe7c8 1 anonymous block ***** Call Stack End ***** PL/SQL procedure successfully completed. SQL> As you can see, the output from the DBMS_UTILITY.FORMAT_CALL_STACK function is rather ugly and we have no control over it, other than to manually parse it. The UTL_CALL_STACK package contains APIs to display the contents of the call stack in a more readable form. DYNAMIC
TrainingOracle Scripts and ToolsSession SnapperSitemapRecent site activity Recent site activityOracle Performance Troubleshooting Trainingedited by Tanel PoderORADEBUG DOCedited by Tanel PoderHomeedited by Tanel PoderTroubleshooting Cursor Sharing (finding the reasons for no reuse of http://tech.e2sn.com/oracle/troubleshooting/how-to-read-errorstack-output existing child cursors)removed by Tanel PoderTroubleshooting excessive logical IOs - Oracle ASSM case studyremoved by Tanel PoderView All Copyright© 2009-2010 E2SN Pte Ltd.All rights reserved. Oracle Living Books‎ > ‎Oracle Troubleshooting‎ > ‎ How to read ERRORSTACK output Errorstack tracefiles are very useful for troubleshooting ORA-600's, crashes, hangs and even just bad performance.Errorstack dumps in oracle are dumped automatically by Oracle when critical errors such as ORA-600 happen. This is when you see an error reported in alert.log and the generated tracefile has a "ksedmp: internal or fatal error" string in its beginning, followed by the error code (usually ORA-7445 or ORA-600 with some parameters). "ksedmp" means Kernel Service Error DuMP, ora error stack so everything below that line is the errorstack dump.Errorstack dumps can also be manually invoked by issuing ORADEBUG ERRORSTACK 3 (when being connected to the target process using ORADEBUG SETOSPID). This can be useful when a session seems to be hung (but without showing a reasonable wait event in V$SESSION_WAIT) or is consuming much more resources than normally and you want to know which exact bind variable values are currently used for executing the SQL.Errorstack tracefile has a lot of information it, some more and some less useful for practical troubleshooting. The vast amount of data and the binary dumps may scare you away, but I hope to show that there's some well understandable structure in there.In this article we will go through following techniques:Contents1 Reading the current executing SQL statement text from errorstack trace2 Reading the current executing PL/SQL package and PL/SQL source code line number from errorstack trace3 Reading the current bind variable values from errorstack trace4 Identifying ho