Troubleshooting Oracle PL/SQL with DBMS_PROFILER and DBMS_UTILITY. John Mullins

Transcription

1 Troubleshooting Oracle PL/SQL with DBMS_PROFILER and DBMS_UTILITY John Mullins

2 Presenter John Mullins Themis Inc. 30+ years of Oracle experience Oracle Certified Professional DBA Certified Technical Trainer Over 280 classes taught

3 Themis Inc. More than 18 years in the industry Committed to your training Courses: DB2, SQL Server, Oracle, Unix, Linux, Java, Web Development,.NET and many more

4 Related / Upcoming Themis Classes OR Troubleshooting, Debugging and Tuning Oracle PL/SQL Programs OR Introduction to Oracle PL/SQL Programming OR Oracle Advanced PL/SQL Programming

5 Webinar Objectives Gain an understanding of how to use the Oracle PL/SQL dbms_profiler and dbms_utility packages to troubleshoot and handle PL/SQL performance issues, program errors and exceptions

6 DBMS_PROFILER Package Enables the collection of performance data Information Gathered: The total number of times each line has been executed The total amount of time that has been spent executing that line The minimum and maximum times that have been spent on a particular execution of that line

7 Profiler Uses Identify hot spots in your PL/SQL code Identify starting points for further tuning efforts

8 Some DBMS_PROFILER Programs START_PROFILER procedure STOP_PROFILER procedure

9 DBMS_PROFILER Setup profload.sql Creates the dbms_profiler package Performs necessary grants Creates a synonym Creates a library Note: Execute as a SYS user

10 DBMS_PROFILER Setup proftab.sql Creates the necessary tables for the profiler to load Creates a couple of sequences Creates some table comments Note: Execute as the user that will be running the profiler session

11 DBMS_PROFILER Usage Steps: Start the profiler Execute application code Stop the profiler Examine the profiler data

12 Profiler Tables PLSQL_PROFILER_RUNS PLSQL_PROFILER_DATA PLSQL_PROFILER_UNITS

13 PLSQL_PROFILER_RUNS SELECT runid, run_owner, run_date, run_total_time/ run_total_time, run_comment FROM plsql_profiler_runs; RUNID RUN_OWNER RUN_DATE RUN_TOTAL_TIME RUN_COMMENT STUDENT 09-NOV web001

14 PLSQL_PROFILER_DATA SELECT s.text, p.total_occur, p.total_time/ total_time, s.line FROM plsql_profiler_data p, user_source s, plsql_profiler_runs r WHERE p.line# = s.line AND p.runid = r.runid AND r.run_comment = 'web001' AND s.name ='P_RUN1' AND s.line <> 1 ORDER BY s.line;

15 PLSQL_PROFILER_DATA TEXT TOTAL_OCCUR TOTAL_TIME LINE v_calculated_value(read_data%rowcount) := (( /2.91) / i.id) + (3.41 * i.id /1.179); FOR i IN LOOP INSERT INTO forall_2 VALUES (v_id(i), v_calculate d_value(i)); FOR i IN LOOP UPDATE forall_ FOR i IN LOOP DELETE FROM forall_ COMMIT; END;

16 DBMS_UTILITY Package The DBMS_UTILITY package provides various utility subprograms FORMAT_CALL_STACK Function FORMAT_ERROR_BACKTRACE Function FORMAT_ERROR_STACK Function GET_CPU_TIME Function GET_TIME Function

17 DBMS_UTILITY Example CREATE OR REPLACE PROCEDURE proc3a IS BEGIN proc2a; EXCEPTION WHEN others THEN DBMS_OUTPUT.put_line (DBMS_UTILITY.format_error_stack); DBMS_OUTPUT.put_line (DBMS_UTILITY.format_error_backtrace); DBMS_OUTPUT.put_line (DBMS_UTILITY.format_call_stack); END; / PROC3A calls PROC2A

18 DBMS_UTILITY Example CREATE OR REPLACE PROCEDURE proc2a IS BEGIN proc1a; EXCEPTION WHEN others THEN DBMS_OUTPUT.put_line (DBMS_UTILITY.format_error_stack); DBMS_OUTPUT.put_line (DBMS_UTILITY.format_error_backtrace); DBMS_OUTPUT.put_line (DBMS_UTILITY.format_call_stack); END; / PROC2A calls PROC1A

19 DBMS_UTILITY Example CREATE OR REPLACE PROCEDURE proc1a IS BEGIN RAISE no_data_found; EXCEPTION WHEN others THEN DBMS_OUTPUT.put_line (DBMS_UTILITY.format_error_stack); DBMS_OUTPUT.put_line (DBMS_UTILITY.format_error_backtrace); DBMS_OUTPUT.put_line (DBMS_UTILITY.format_call_stack); END; / PROC1A raises an exception Execute PROC3a.

20 DBMS_UTILITY Output ORA-01403: no data found ORA-06512: at "STUDENT.PROC1A", line PL/SQL Call Stack Object handle name 00007FFAAA FFAAA FFAAA641FC FFAAD56CC98 line object number 7 procedure STUDENT.PROC1A 4 procedure STUDENT.PROC2A 4 procedure STUDENT.PROC3A 1 anonymous block

21 GET_TIME/GET_CPU_TIME Usage DECLARE v_before_time BINARY_INTEGER; v_after_time BINARY_INTEGER; BEGIN v_before_time := DBMS_UTILITY.GET_TIME; -- Code to measure or procedure/function call goes here v_after_time := DBMS_UTILITY.GET_TIME; DBMS_OUTPUT.PUT_LINE (v_after_time v_before_time); END; /

22 Summary The Oracle PL/SQL DBMS_PROFILER and DBMS_UTILITY packages provide programs to assist with the tuning and troubleshooting of application PL/SQL programs Questions?

23 Themis Oracle Classes Classes are offered in a public classroom, onsite at your location, or live on the internet: Troubleshooting, Debugging and Tuning Oracle PL/SQL Programs Introduction to Oracle PL/SQL Programming Oracle Advanced PL/SQL Programming Oracle SQL Optimization Oracle SQL, Oracle Advanced SQL Oracle Database Performance Tuning for Administrators And many more

24 Our Next Free Webinar Developer Best Practices for DB2 Performance Thursday December 17, :30 AM EST In this webinar, Tony Andrews of Themis will discuss: 1) The key areas that can cause performance issues with DB2 queries and applications 2) DB2 optimization 3) How DB2 database design affects performance 4) How DB2 data distribution statistics affects performance 5) Writing efficient SQL code

25 For More Information Visit the Themis web site John Caccavale To get a copy of the presentation: Thank you for attending. Have a good day.