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Before running the first replay, you must perform some prerequisite checks: Ensure that the target system has access to the replay directory Remap references to other production systems via database links, external tables, directory objects, URLs, and e-mail notifications Remap connection strings to the replay system from the production system
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TIP Failing to remap all references to the production system could be disastrous, as your replay exercise might then update the production database By default, the order of all COMMIT statements is preserved, which is usually the best option to prevent data divergence However, if most or all of the transactions are independent, you can turn off preservation of the COMMIT order to run the replay faster To launch a replay, in the target database run two procedures to prepare the database:
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execute dbms_workload_replayinitialize_replay('replay 1','REP_CAP_DIR'); execute dbms_workload_replayprepare_replay;
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The INITIALIZE_REPLAY procedure requires two arguments (the name of the operation, and the directory containing the data) and puts the database into a state
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where a replay can be launched The PREPARE_REPLAY procedure has optional arguments that will control how quickly the replay will run Having completed the preparatory work, the replay clients must now be started These are independent operating system processes, launched by running an executable file in the $ORACLE_HOME/bin directory This will launch a replay client The basic syntax is
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wrc <username> / <password>
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Finally, the replay can be started:
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SQL> execute dbms_workload_replaystart_replay;
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This last procedure call will allow the connected clients to start running the statements in the captured workload
Database Replay Analysis and Reporting
Database Replay generates a report detailing actual results of the replay, including all exception conditions such as data divergence due to incorrect or out-of-sync DML statements or SQL queries Also included in the report are detailed time-based statistics such as total DB time and average session time You can also use AWR reports to perform a detailed comparison between the captured workload and the replayed workload You can use the PL/SQL package DBMS_WORKLOAD_REPLAY to retrieve and generate a report, as in this example:
declare capture_dir_id number; curr_replay_id number; replay_report clob; begin /* retrieve pointer to all captured sessions */ /* in the replay directory */ capture_dir_id := dbms_workload_replayget_replay_info(dir => 'REP_CAP_DIR'); /* get latest replay session id */ select max(id) into curr_replay_id from dba_workload_replays where capture_id = capture_dir_id; /* generate the report */ replay_report := dbms_workload_replayreport (replay_id => curr_replay_id, format => dbms_workload_replaytype_text); end;
Note that you may have more than one report in the replay directory if you have performed the replay more than once The SELECT statement in the PL/SQL block
25: Performance Tuning
ensures that you retrieve the latest report You can use DELETE_REPLAY_INFO to delete a report in the replay directory Exercise 25-5: Use Database Replay In this exercise, you will generate and capture a workload, and replay it after adding an index The report will show improved performance 1 Using SQL*Plus, connect to your database as user SYSTEM Create a user, a table, and a directory (substitute a path suitable for your environment) to be used for this exercise:
grant dba to player identified by player; create table playert1 as select * from all_objects; create directory play_d as '/home/oracle/play_d'; grant all on directory play_d to public;
PART III
2 Start the capture:
exec dbms_workload_capturestart_capture('play capture','PLAY_D');
The illustration shows Steps 1 and 2
3 Connect as the new user, and run a PL/SQL block that will generate a workload on the database:
connect player / player declare m number; begin for i in 11000 loop select count(1) into m from t1 where object_id=1; end loop; end;
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This illustration shows Step 3
4 Connect as SYSTEM Terminate the capture, and process it:
execute dbms_workload_capturefinish_capture; execute dbms_workload_replayprocess_capture('PLAY_D');
5 Replay the workload Note that when launching the replay client, you must specify the physical path, not the Oracle directory:
exec dbms_workload_replayinitialize_replay('play capture','PLAY_D'); exec dbms_workload_replayprepare_replay;
In a separate window, launch the client from an operating system prompt:
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