December 2010
Intermediate to advanced
451 pages
11h 16m
English
Content preview from Oracle and PL/SQL Recipes: A Problem-Solution Approach
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13-2. Identifying Bottlenecks
Problem
You notice that a PL/SQL program is running slowly, and you need to identify what sections of the code are causing it to perform poorly.
Solution
Use the DBMS_PROFILER routines to analyze the code and find potential bottlenecks. In the following example, the profiler is used to collect statistics on a run of a program, and then a query displays the statistics.
EXEC DBMS_PROFILER.START_PROFILER ('Test1', 'Testing One');
EXEC sync_hr_data; -- the procedure identifed has having a bottleneck
EXEC DBMS_PROFILER.FLUSH_DATA;
EXEC DBMS_PROFILER.STOP_PROFILER;
Now that the profile data is collected, you can query the underlying tables to see the results of the analysis:
COL line# FORMAT 999 COL hundredth FORMAT ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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