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4. Capture the production workload using a representative period. Execute the START_CAPTURE procedure to capture the workload: begin dbms_workload_capture.start_capture (name => '2008Jan', dir => 'jan08', duration => 1200); end; Only the DIR parameter, which specifies the capture directory, is mandatory. If you omit the DURATION parameter, the workload capture will continue until you manually stop it as shown here: begin dbms_workload.capture.finish_capture (); end; ; / You can use the DBA_WORKLOAD_CAPTURES view to get information about the workload capture.
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Preprocessing the Workload
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You must preprocess the captured workload before you can replay it. Preprocessing is the step that converts the captured workload into replay files. As long as the database version is identical, you can preprocess the workload on the production system or a test system. Here s how to preprocess the workload: begin dbms_workload_replay.process_capture (capture_dir => 2008jan'); end; Preprocessing the workload produces the metadata for the captured workload and transforms the captured workload datafiles into replay streams called replay files.
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Making the System Change
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At this point, make the system change you want to test on the test system. Once you make the change such as upgrading the database release, you can replay the captured production workload in the changed system to test the impact of the system change on performance, errors, and other related areas.
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Replaying the Captured Workload
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Create a test system that s identical in every respect to the production system to run the captured production workload. You can duplicate the database on a test server to do this. Replaying the workload on the test system involves the following steps:
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Setting Up the Test System Restore the production system on the test server, making sure it has the same application state as the production system. To avoid date-related errors, make sure the system time on the test system is set to the same time as prevailed at the start of the workload capture. Start the test system in the restricted mode to avoid errors.
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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Resolving External References External references include objects such as database links, directory
objects, and URLs. Before starting the replay, resolve all external references from the database. For example, all database links must be fully functional on the test system and point to the test system instead of the production database.
Setting Up the Replay Clients
Database Replay relies on a special application called the replay driver to send workload replay requests to the database. The replay driver is made up of replay clients that connect to the test system and simulate the external requests. So, the replay clients replace all external client interactions by sending requests that seem as if they came from the external clients themselves. You can have more than one replay client to share the replay workload, in which case it s best to install the multiple replay clients on separate servers. After ensuring that you ve moved the workload files to the appropriate replay directory, start the replay client as shown here: $ wrc [user/password[$server]] mode=[value] [keyword=[value]] You can execute the wrc executable in different modes such as REPLAY, CALIBRATE, or LIST_HOSTS, by setting the MODE parameter. The parameter KEYWORD lets you specify execution options. You can find out the options available to you by typing in wrc at the command line: $ wrc Workload Replay Client: Release 11.1.0.6.0 - Production on Wed April 30 12:45:01 2007 Copyright (c) 1982, 2007, Oracle. All rights reserved. FORMAT: ======= wrc [user/password[@server]] [MODE=mode-value] KEYWORD=value Example: ======== wrc REPLAYDIR=. wrc scott/tiger@myserver REPLAYDIR=. wrc MODE=calibrate REPLAYDIR=./capture The default privileged user is: SYSTEM Mode: ===== wrc can work in different modes to provide additional Functionalities. The default MODE is REPLAY. Mode Description ---------------------------------------------------------------REPLAY Default mode that replays the workload in REPLAYDIR CALIBRATE Estimate the number of replay clients and CPUs needed to replay the workload in REPLAYDIR. LIST_HOSTS List all the hosts that participated in the capture or replay.
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