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CHAPTER 18 MA NA GING AND M ONITORING THE OPERATIONA L DATABA SE
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5. You can accept the patch recommended by the SQL Repair Advisor by executing the ACCEPT_SQL_PATCH procedure. SQL> exec dbms_sqldiag.accept_sql_patch ( task_name => 'test_task1', task_owner => 'SYS') If you execute the SQL statement after accepting the recommended patch, you ll see a different execution plan for the statement. Use the DBA_SQL_PATCHES view to find out the names of all patch recommendations made by the SQL Repair Advisor. You can drop a patch by executing the DROP_SQL_PATCH procedure. You can also export a SQL patch to a different database by using a staging table.
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The SQL Test Case Builder
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You can quickly create a test case for submission to Oracle Support by using the new SQL Test Case Builder. The SQL Test Case Builder provides information about the SQL query, object definitions, procedures, functions and packages, optimizer statistics, and initialization parameter settings. The SQL Test Case Builder creates a SQL script that you can run in a different system to re-create the database objects that exist in the source database. You can invoke the SQL Test Case Builder by executing the DBMS_SQLDIAG.EXPORT_SQL_TESTCASE_DIR_BY_INC function. This function will generate a SQL Test Case corresponding to the incident ID you pass to the function. You can instead use the DBMS_SQLDIAG.EXPORT_SQL_TESTCASE_DIR_BY_TEXT function to generate a SQL test case that corresponds to the SQL text you pass as an argument. However, as usual, it s a lot easier to access the SQL Test Case Builder through the Enterprise Manager, where you can get to it from the Support Workbench page by following these steps: 1. Go to the Problem Details page by clicking the relevant problem ID. 2. Click Oracle Support. 3. Click Generate Additional Dumps and Test Cases. 4. Click the icon in the Go to Task column in the Additional Dumps and Test Cases page. This ll start the SQL Test Case Builder analysis for the relevant SQL statement.
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PART 7
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Performance Tuning
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Improving Database Performance: SQL Query Optimization
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erformance tuning is the one area in which the Oracle DBA probably spends most of his or her time. If you re a DBA helping developers to tune their SQL, you can improve performance by suggesting more efficient queries or table- and index-organization schemes. If you re a production DBA, you ll be dealing with user perceptions of a slow database, batch jobs taking longer and longer to complete, and so on. Performance tuning focuses primarily on writing efficient SQL, allocating appropriate computing resources, and analyzing wait events and contention in the system. This chapter focuses on SQL query optimization in Oracle. You ll learn about the Oracle optimizer and how to collect statistics for it. You ll find an introduction to the new Automatic Optimizer Statistics Collection feature. You can also manually collect statistics using the DBMS_STATS package, and this chapter shows you how to do that. You ll learn the important principles that underlie efficient code. I present a detailed discussion of the various tools, such as the EXPLAIN PLAN and SQL Trace utilities, with which you analyze SQL and find ways to improve performance. Oracle provides several options to aid performance, such as partitioning large tables, using materialized views, storing plan outlines, and many others. This chapter examines how DBAs can use these techniques to aid developers efforts to increase the efficiency of their application code. This chapter introduces the SQL Tuning Advisor to help you tune SQL statements. You can then use the recommendations of this advisor to rewrite poorly performing SQL code. I begin the chapter with a discussion of how to approach performance tuning. More than the specific performance improvement techniques you use, your approach to performance tuning determines your success in tuning a recalcitrant application system.
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