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Options (listed by mode): ========================= MODE=REPLAY (default) --------------------Keyword Description ---------------------------------------------------------------USERID username (Default: SYSTEM) PASSWORD password (Default: default password of SYSTEM) SERVER server connection identifier (Default: empty string) REPLAYDIR replay directory (Default:.) WORKDIR work directory (Default:.) DEBUG FILES, STDOUT, NONE (Default: NONE) FILES (write debug data to files at WORKDIR) STDOUT (print debug data to stdout) BOTH (print to both files and stdout) NONE (no debug data) CONNECTION_OVERRIDE TRUE, FALSE (Default: FALSE) TRUE All replay threads connect using SERVER, settings in DBA_WORKLOAD_CONNECTION_MAP will be ignored! FALSE Use settings from DBA_WORKLOAD_CONNECTION_MAP SERIALIZE_CONNECTS TRUE, FALSE (Default: FALSE) TRUE All the replay threads will connect to the database in a serial fashion one after another. This setting is recommended when the replay clients use the bequeath protocol to communicate to the database server. FALSE Replay threads will connect to the database in a concurrent fashion mimicking the original capture behavior. MODE=CALIBRATE ,,, MODE=LIST_HOSTS . . . If you have a large number of user sessions, you ll need multiple wrc clients on different hosts. Each replay thread from a replay client represents a single stream from the captured workload. Although the default mode is REPLAY, it may be a good idea to first execute the wrc in CALIBRATE mode to estimate the number of replay clients and hosts you ll need to replay the workload. After you run the wrc in CALIBRATE mode, you can execute wrc in REPLAY mode, as shown here: $ wrc system/<system_password> mode=replay replay_dir=./test_dir
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Initializing the Replay Data
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Your next step is to initialize the workload data by executing the INITIALIZE_REPLAY procedure: SQL> exec dbms_workload_replay.initialize_replay(replay_name => 'test_replay',replay_dir => 'test_dir'); Initializing the data loads the metadata into tables that are used by Database Replay.
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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Remapping External Connections
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Before you start the workload replay, you must remap all external connections by executing the REMAP_CONNECTION procedure as shown here. SQL> exec dbms_workload_replay.remap_connection (connection_id =>999, replay_connection => 'prod1:1521/testdb'); Remapping connections ensures users can connect to all the external databases. If you leave the REPLAY_CONNECTION parameter out, all replay sessions will automatically try connecting to the default host.
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Setting Workload Options
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The next step is the setting of various workload replay options. You can select from one of the following four options: SYNCHRONIZATION: The default for this parameter is true. This option preserves the commit order of the workload during the replay. With this parameter set to true, you can eliminate data divergence caused by not following the commit order among dependent transactions. CONNECTION_TIME_SCALE: This parameter lets you adjust the time between the beginning of the workload capture and the time when a session connects with the specified value. By adjusting this parameter, you can control the number of concurrent users during the replay. THINK_TIME_SCALE: This parameter enables you to calibrate the elapsed time between user calls in the same session. The smaller the value, the faster the client requests are sent to the database.
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During a workload capture, elapsed time consists only of user time and user think time, whereas during a workload replay, elapsed time also includes the synchronization time component.
THINK_TIME_AUTO_CORRECT: If you set this parameter to true, the database automatically corrects the think time specified by the THINK_TIME_SCALE parameter. For example, if the replay is moving slowly, the database reduces the value of the THINK_TIME_SCALE parameter. By default, this parameter is set to false.
Preparing the Workload for Replay
Before replaying the captured workload, prepare the workload by executing the PREPARE_REPLAY procedure: SQL> dbms_workload_replay.prepare_replay (replay_name => 'replay1',replay_dir => 'test_dir', synchronization= FALSE); If the workload consists mostly of independent transactions, it s better to ignore the commit order by setting the SYNCHRONIZATION parameter to false, as shown in the example.
Starting the Workload Replay
Execute the START_REPLAY procedure to begin the workload replay, as shown here: SQL> exec dbms_workload_replay.start_replay();
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