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The indexes could become unbalanced in a database with a great deal of DML. It s important to rebuild such indexes regularly so queries can run faster. You may want to rebuild an index to change its storage characteristics or to consolidate it and reduce fragmentation. Use the ALTER INDEX . . . REBUILD statement, because the old index is accessible while you re re-creating it. (The alternative is to drop the index and re-create it.) When you rebuild the indexes, include the COMPUTE STATISTICS statement so you don t have to gather statistics after the rebuild. Of course, if you have a 24/7 environment, you can use the ALTER INDEX . . . REBUILD ONLINE statement so that user access to the database won t be affected. It is important that your tables aren t going through a lot of DML operations while you re rebuilding
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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online, because the online feature may not work as advertised under such circumstances. It might even end up unexpectedly preventing simultaneous updates by users.
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The Segment Advisor runs automatically during the scheduled nightly maintenance and provides you with recommendations about objects you can shrink to reclaim wasted space. Just remember that you need to use locally managed tablespaces with Automatic Segment Space Management in order to use the Segment Advisor. Shrinking segments saves space, but more importantly, improves performance by lowering the high-water mark of the segments and eliminating the inevitable fragmentation that occurs over time in objects with heavy update and delete operations.
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If the application doesn t reuse a table s data for a long period, the data might be aged out of the SGA and need to be read from disk. You can safely pin small tables in the buffer cache with the following: SQL> ALTER TABLE hr.employees CACHE; Table altered. SQL>
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SQL performance tuning tools are extremely important. Developers can use the tools to examine good execution strategies, and in a production database they re highly useful for reactive tuning. The tools can give you a good estimate of resource use by queries. The SQL tools are the EXPLAIN PLAN, Autotrace, SQL Trace, and TKPROF utilities.
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Using EXPLAIN PLAN
The EXPLAIN PLAN facility helps you tune SQL by letting you see the execution plan selected by the Oracle optimizer for a SQL statement. During SQL tuning, you may have to rewrite your queries and experiment with optimizer hints. The EXPLAIN PLAN tool is great for this experimentation, as it immediately lets you know how the query will perform with each change in the code. Because the utility gives you the execution plan without executing the code, you save yourself from having to run untuned software to see whether the changes were beneficial or not. Understanding an EXPLAIN PLAN is critical to understanding query performance. It provides a window into the logic of the Oracle optimizer regarding its choice of execution plans. The output of the EXPLAIN PLAN tool goes into a table, usually called PLAN_TABLE, where it can be queried to determine the execution plan of statements. In addition, you can use GUI tools, such as OEM or TOAD, to get the execution plan for your SQL statements without any fuss. In OEM, you can view the explain statements from the Top Sessions or the Top SQL charts. A walkthrough of an EXPLAIN PLAN output takes you through the steps that would be undertaken by the CBO to execute the SQL statement. The EXPLAIN PLAN tool indicates clearly whether the optimizer is using an index, for example. It also tells you the order in which tables are being joined and helps you understand your query performance. More precisely, an EXPLAIN PLAN output shows the following: The tables used in the query and the order in which they re accessed. The operations performed on the output of each step of the plan. For example, these could be sorting and aggregation operations.
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