1 © 2010 Julian Dyke Real Application Testing Julian Dyke Independent Consultant juliandyke.com Web Version

© 2010 Julian Dyke juliandyke.com 2 Real Application Testing Introduction  Introduced in Oracle 11.1  Licensable option  Includes  Database Replay  SQL Performance Analyzer  Database Replay  Captures database workload on production system  Replays captured workload on test system  Optionally includes concurrency and timing characteristics  Generates reports and recommends changes  SQL Performance Analyzer  Identifies performance divergence between workloads on source and target platforms  Generates tuning recommendations

© 2010 Julian Dyke juliandyke.com 3 Real Application Testing Database Replay  Requires the following steps:  Capture workload into capture files  Copy files to test system and preprocess them  Replay files on test system  Perform detailed analysis of workload capture and replay using reports generated by Database Replay  Potential applications  Test operating system upgrades  Test database upgrades and migrations  Test parameter changes  Evaluate migration from single-instance to RAC  Test storage changes  Debugging  Test database manageability features

© 2010 Julian Dyke juliandyke.com 4 Real Application Testing Workload Capture  To capture workload on an existing system:  Create a operating system directory e.g. mkdir /home/oracle/rat/test1 SQL> CREATE DIRECTORY dir1 AS '/home/oracle/rat/test1';  Create an Oracle directory e.g.:  Run the workload:  Start the capture process: dbms_workload_capture.start_capture ( name => 'TEST4', dir => 'DIR4' ); dbms_workload_capture.finish_capture;  Finish the capture process:

© 2010 Julian Dyke juliandyke.com 5 Real Application Testing Replay Preparation  Copy the capture files to the target database server  On the target database  Preprocess the captured workload dbms_workload_replay.process_capture ( capture_dir => 'DIR1' );  Initialize the replay dbms_workload_replay.initialize_replay ( replay_name => 'REPLAY1', replay_dir => 'DIR1' ); dbms_workload_replay.prepare_replay ( synchronization => FALSE );  Prepare the replay

© 2010 Julian Dyke juliandyke.com 6 Real Application Testing Workload Replay  Copy the workload files to the client system. For example:  /home/oracle/rat/test1  On the client  Run the workload client to calibrate the replay  The calibration process recommends the number of client processes required to perform the replay  Replay the workload $ wrc mode=CALIBRATE \ replaydir=/home/oracle/rat/test1 $ wrc mode=REPLAY \ replaydir=/home/oracle/rat/test1  The client will not start to replay the workload until the replay has been started on the target database

© 2010 Julian Dyke juliandyke.com 7 Real Application Testing Workload Replay  On the target database  Start the replay process dbms_workload_replay.start_replay;  When the replay process completes on the client, run the replay report SET SERVEROUTPUT ON TRIMSPOOL ON LONG LINESIZE 200 VAR v_rep_rpt CLOB; DECLARE l_cap_id NUMBER; l_rep_id NUMBER; BEGIN l_cap_id := dbms_workload_replay.get_replay_info (dir => 'DIR4'); SELECT MAX (id) INTO l_rep_id FROM dba_workload_replays WHERE capture_id = l_cap_id; :v_rep_rpt := dbms_workload_replay.report ( replay_id => l_rep_id, format => DBMS_WORKLOAD_CAPTURE.TYPE_TEXT ); END; / PRINT :v_rep_rpt

© 2010 Julian Dyke juliandyke.com 8 Real Application Testing SQL Performance Analyzer  Can analyze impact on SQL performance of  Database upgrade  Configuration changes to operating system or hardware  Schema changes  Changes to database initialization parameters  Refreshing optimizer statistics  SQL tuning

© 2010 Julian Dyke juliandyke.com 9 Thank you for your interest