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SQL Optimizer for Oracle 10.0 - User Guide

Welcome to SQL Optimizer
About SQL Optimizer SQL Optimization Workflow New in This Release Additional Resources Database Privileges Database Privileges Script Connect to the Database Windows Layout Customize Toolbars Keyboard Shortcuts Support Bundle Register SQL Optimizer Check for Updates SQL Operations
ALL PARTITION ALTER INDEX AND EQUAL ANTI JOIN BITMAP AND BITMAP COMPACTION BITMAP CONSTRUCTION BITMAP CONVERSION BITMAP INDEX BITMAP JOIN INDEX UPDATE BITMAP JOIN INDEX UPDATE STATEMENT BITMAP KEY ITERATION BITMAP MERGE BITMAP MINUS BITMAP OR BUFFER SORT CARTESIAN JOIN COLLECTION ITERATOR CONCATENATION CONNECT BY CONNECT BY PUMP COUNT COUNT STOPKEY CREATE AS SELECT CUBE SCAN DDL STATEMENT DELETE DOMAIN INDEX FAST FULL INDEX SCAN FILTER FIRST ROWS FIXED INDEX FIXED TABLE FOR UPDATE FULL INDEX SCAN FULL INDEX SCAN DESCENDING FULL INDEX SCAN (MIN/MAX) HASH GROUP BY HASH GROUP BY PIVOT HASH JOIN HASH JOIN BUFFERED HASH PARTITION HASH UNIQUE INDEX INDEX BUILD NON UNIQUE INDEX RANGE SCAN INDEX RANGE SCAN DESCENDING INDEX RANGE SCAN (MIN/MAX) INDEX SAMPLE FAST FULL SCAN INDEX SKIP SCAN INDEX SKIP SCAN DESCENDING INDEX UNIQUE SCAN INLIST ITERATOR INLIST PARTITION INSERT INTERSECTION INTO INVALID PARTITION ITERATOR PARTITION LOAD AS SELECT MAT_VIEW ACCESS MAT_VIEW REWRITE ACCESS MERGE JOIN MINUS MULTI-TABLE INSERT NESTED LOOPS OUTER JOIN PARTITION PARTITION HASH EMPTY PARTITION LIST PARTITION RANGE PROJECTION PX BLOCK ITERATOR PX COORDINATOR PX ITERATOR PX PARTITION PX PARTITION HASH ALL PX PARTITION LIST ALL PX PARTITION RANGE ALL PX RECEIVE PX SEND RANGE PARTITION RECURSIVE EXECUTION RECURSIVE WITH PUMP REFERENCE MODEL REMOTE SELECT SEMI JOIN SEQUENCE SINGLE PARTITION SINGLE RANGE PARTITION SORT SORT AGGREGATE SORT GROUP BY SORT GROUP BY CUBE SORT GROUP BY NOSORT SORT GROUP BY ROLLUP SORT JOIN SORT ORDER BY SORT UNIQUE SQL MODEL TABLE ACCESS TABLE ACCESS BY GLOBAL INDEX ROWID TABLE ACCESS BY INDEX ROWID TABLE ACCESS BY LOCAL INDEX ROWID TABLE ACCESS BY ROWID TABLE ACCESS BY USER ROWID TABLE ACCESS CLUSTER TABLE ACCESS FULL TABLE ACCESS HASH TABLE ACCESS SAMPLE TABLE QUEUE TEMP TABLE GENERATION TEMP TABLE TRANSFORMATION UNION UNION ALL UNION ALL (RECURSIVE WITH) UNPIVOT UPDATE VIEW VIEW PUSHED PREDICATE WINDOW
Optimize SQL
Create Optimize SQL Sessions Open Optimizer SQL Sessions Rewrite SQL Generate Execution Plan Alternatives
Optimize Indexes Batch Optimize SQL Scan SQL Inspect SGA Analyze Impact Manage Plans Configure Options SQL Optimizer Tutorials About Us Legal Notices

Generate Optimize SQL Resolution Report

You can generate a resolution report for a SQL Rewrite or Plan Control session after you generate execution plan alternatives. The resolution report includes the following:

  • Resolution summary
  • Comparison graph
  • Execution statements comparison
  • Optimization session information
  • Text, statistics, and plan for each selected statement
  • Best Alternative scenario
  • Other Alternative scenarios

Tip: You can also export the contents of a SQL Rewrite grid (or other grid) to an Excel file. Right-click the grid and select Save As | Excel Document. Other file formats are also available.

To generate a report

  1. In a SQL Rewrite or Plan Control session, after generating and executing SQL or plan alternatives, click .

  2. Use the report window to customize the layout and the information displayed in the report, and to select publishing options. Use the following Report toolbar buttons.

    Toolbar Button Description
    Current Settings. Click to specify the information to include in your report.
    Page Setup. Click to modify margins and select page orientation.
    Scale. Click to adjust the scale of the printed output.

    Watermark. Click to add a watermark to the report.

    • To upload an image to use as the watermark, select the Picture Watermark tab.
    Color. Click to change the report background color.

    Export Document. Click to save the report to file using the default format. Click the arrow to select from several file format options (or to change the default setting).

    You can select from several different file formats, including PDF, HTML, and Excel.

    Send via Email. Click to save the report to file using the default format and to also attached the file to an email. Click the arrow to select from several file format options (or to change the default setting).

Note: To select SQL or plan alternatives to include in the report, click and then click Select Alternatives. Select alternatives from the list.

To export the report as a PDF file

  1. In the Report window, click the arrow beside and select PDF.
  2. In the PDF Export Options dialog, configure the PDF options and click OK.
  3. Enter a file name and select a location for your report.

  

Related Topics

About Optimizing SQL (SQL Rewrite)

About Optimizing SQL (Plan Control)

Deploy Baselines

In a Plan Control session, deploy an execution plan as a plan baseline to the Manage Plan module.

To deploy a baseline

  1. Select Optimize SQL.
  2. In a Plan Control session, after generating and executing alternative plans, click .
  3. Complete the fields in the Deploy pane. Review the following for additional information:
    Deploy Description

    Select a plan to deploy

    		 Click and select an execution plan alternative to deploy as a baseline plan.

    Performance comparison

    		 Use this to review the performance of selected plans against the original.

    Mark the plan as

    Review the following for additional information:

    • Enabled—Select whether to enable or disable this plan.
    • Fixed—Select whether to deploy this plan as fixed or non-fixed.
    • Not Auto-Purged—Select whether to auto-purge when it is not used.

    Plan name

    		 Enter a name for the plan.

    Description

    		 Enter a description for this plan.

  4. Click .

  

Related Topics  

About Optimizing SQL (Plan Control)

Generate Execution Plan Alternatives

Test Run Execution Plan Alternatives

Manage Baselines

Optimize Indexes

About Optimize Indexes

Use Optimize Indexes to analyze and improve indexes for a SQL workload or for any group of SQL statements. You can instruct SQL Optimizer to gather SQL from an application workload during a specified time period. SQL Optimizer evaluates your SQL workload and provides you with the best set of indexes to optimize database performance for that workload. After this evaluation process is complete, you can review the results and then select the new indexes you want to save and test.

Note: To optimize indexes for a single SQL statement, use Optimize SQL. See About Optimizing SQL (SQL Rewrite) for more information.

SQL Workload Sources

You can instruct SQL Optimizer to gather a SQL workload from any of the following sources:

  • Oracle's Automatic Workload Repository (AWR)
  • Oracle's System Global Area (SGA)
  • Source code

Optimize Indexes Workflow

After collecting the statements, SQL Optimizer provides you with the execution plans and run-time statistics. Select the statements for which you want to optimize indexes. After running the evaluation process, review the results to determine the performance improvements. If, after reviewing the results, you choose to add new indexes, you can perform an Index Impact Analysis to determine the impact (of creating the indexes) on database performance.

The following is a summary of the Optimize Indexes workflow:

Considerations

Things to consider when using Optimize Indexes:

  • When analyzing workloads, SQL Optimizer uses proprietary, modified genetic algorithms (patent pending) to continuously improve its results. Therefore, the longer the evaluation process runs, the better the result.
  • While performing a search for new indexes to optimize performance, SQL Optimizer updates its recommendations over time to reflect any changes in data distribution or configuration.
  • You can schedule the evaluation process to run once, continuously, or periodically at defined intervals.
  • You can stop the process manually or configure it to stop automatically when specific goals are met.
  • The evaluation process can be paused and resumed.
  • Optimize Indexes' evaluation of SQL and search for new indexes is a low-overhead process.
  • Select, update, delete, insert, and merge statements are supported.
  • Only one index search process can be active at any one time. However, multiple SQL workloads can be opened and reviewed concurrently.

About the Evaluation Process

When evaluating your SQL workload, SQL Optimizer creates virtual indexes. No indexes are created, so this process does not significantly affect database performance. Also, the Index Impact Analysis process uses virtual indexes to evaluate the impact on database performance.

Note: You can use Optimize Indexes only when connected to an Oracle 8i (or later) database.

 

Go to Step one. See Select a SQL Workload Source.

 

Related Topics

Select a SQL Workload Source

Optimize Indexes for AWR Workload

Optimize Indexes for SGA Workload

Optimize Indexes from Scanned Code Workload

 

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