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When you re planning a major system change, you spend a significant amount of time testing your system before cutting over to production. No matter how much prior testing you perform, there s no guarantee that the production cutover to the new system will be trouble free, as you ve never had the chance to test in the production environment itself. Oracle offers two brand-new tools called Database Replay and the SQL Performance Analyzer as part of the new Real Application Testing, or Total Recall, feature, to help you test your application performance before an actual system change, thus providing you great change management support. I discuss the Database Replay feature first in this section and explain the SQL Performance Analyzer feature toward the end of the chapter. Database Replay offers you a way to test your system changes on a test system where you can simulate the actual production workload. You first capture the actual production workload over a representative period such as a peak period and replay it on a test system, thus re-creating your production system on a test system. The replay adheres to the original production concurrency and timing characteristics. The replay executes the RDBMS code in a way similar to how it was executed on the production system. The way it does this is by replaying all external client requests made to the RDBMS. The testing process will reveal whether there are any significant performance differences or errors between the before and after system change performance. Database Replay will also recommend fixes to the problems it encounters during the production workload replay. Database Replay offers a powerful, easy-to-implement system that lets you test system changes with confidence. If you re moving from a single instance to an Oracle RAC environment, for example, you can test the database performance on a test system first before making the production cut over. You can use Database Replay to test operating system and database upgrades, configuration changes such as a switch to a RAC system from a single-instance system and changes in the storage system. Database Replay captures all external requests such as SQL queries, PL/SQL code blocks, logins and logoffs, and DML/DDL statements. It ignores background jobs and requests made by
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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internal clients such as the Enterprise Manager. Database Replay ignores the following types of client requests: SQL*Loader direct path load of data Oracle Streams Data Pump Import and Export Advanced replication streams Non PL/SQL-based Advanced Queuing (AQ) Flashback Database and Flashback Queries Distributed transactions and remote describe/commit operations Shared server You can use either Enterprise Manager or APL/SQL APIs to run Database Replay. I show the manual steps in the following sections.
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Capturing the Production Workload
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Use the DBMS_WORKLOAD_CAPTURE package to capture the database workload. The database uses binary files called capture files to stop all captured external client requests to the database. The capture files hold client request related information such as SQL statements and bind values. Here are the steps you must follow to capture the database workload: 1. Restart the database; although this isn t mandatory, it will minimize the errors and data divergence due to uncommitted or partial transactions at the time of the start of the data capture. You want to restart the database in restricted mode. Once you start the workload capture, the database automatically switches to an unrestricted mode of operation.
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You can use a physical restore method using an SCN or a point in time, a logical restore method, or a flashback or snapshot standby technique to re-create the production system on the test server.
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2. Define workload filters. You can use exclusion or inclusion filters to capture only a part of the actual workload and ignore the rest, as shown in the following example: SQL> begin dbms_workload_capture.add_filter fname => fattribute => fvalue => end; / In this example, I restrict the workload capture to external calls made by the user SALAPATI. 3. Set up a capture directory before starting the workload capture, making sure this directory is large enough to hold the workload. You can use a new or a preexisting directory. ( 'user_salapati', 'USER', 'salapati'
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