ORACLE performance optimization - DBMS_HPROF

This tool is somewhat similar to DBMS_PROFILER, but it is too fine-grained than DBMS_PROFILER. There is no hierarchy and no summary, while DBMS_PROFILER can provide layer-by-layer summary information similar to the organization tree.

Steps for usage

1. First create an external directory PLSHPROF_DIR (create or replace directory PLSHPROF_DIR as '/tmp'; )
2. Assign read and write permissions to the directory to the specified database user (GRANT WRITE, READ ON DIRECTORY PLSHPROF_DIRTO apps;)
3. Grant sys.dbms_hprof execution permission to the specified database user (grant execute on dbms_hprof to apps;)
4. Execute the script @?/rdbms/admin/dbmshptab.sql to initialize the environment
5. Open a session and execute dbms_hprof.start_profiling(location => 'PLSHPROF_DIR', filename => 'pwdbb
   w.trc');
6. In the same session, execute related stored procedures
7. End: dbms_hprof.stop_profiling;
8. Execute in the ORACLE_BIN directory: plshprof -output hprof pwdbbw.trc
9. Where hprof is the name of the generated output html file, and pwdbbw.trc is the source tracking file
10. View the generated html report