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The Oracle database lets you use table compression to compress tables, table partitions, and materialized views. Table compression helps reduce space requirements for the tables and enhances query performance. Oracle compresses the tables by eliminating the duplicate values in a data block and replacing those values with algorithms to re-create the data when necessary. The table compression technique is especially suitable for data warehouse and OLAP databases, but OLTP databases can also use the technique fruitfully. The larger the table that is compressed, the more benefits you ll achieve with this technique. Here s a simple table compression statement: SQL> CREATE table sales_compress 2 COMPRESS 3 AS SELECT * FROM sh.sales; Table created. SQL> You can also use index key compression to compress the primary key columns of IOTs. This compression not only saves you storage space, but also enhances query performance. Index compression works by removing duplicate column values from the index. To compress an index, all you have to do is add the keyword COMPRESS after the index-creation statement, as shown here: SQL> CREATE INDEX item_product_x 2 ON order_items(product_id) 3 TABLESPACE order_items_indx_01 4 COMPRESS; Index created. SQL> Perform some tests to confirm the space savings and the time savings during the creation statements. Later, you can test query performance to measure the improvement.
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If you re dealing with large amounts of data, you should seriously consider using materialized views to improve response time. Materialized views are objects with data in them usually summary data from the underlying tables. Expensive joins can be done beforehand and saved in the materialized
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CHAPTER 21 IMPROVING DATABASE PERFORMANCE: SQL QUERY OPTIMIZATION
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view. When users query the underlying table, Oracle automatically rewrites the query to access the materialized view instead of the tables. Materialized views reduce the need for several complex queries because you can precalculate aggregates with them. Joins between large tables and data aggregation are expensive in terms of resource usage, and materialized views significantly reduce the response time for complex queries on large tables. If you aren t sure which materialized views to create, not to worry you can use the DBMS_OLAP package supplied by Oracle to get recommendations on ideal materialized views. 5 discusses materialized views in more detail, and also shows you how to use the SQL Access Advisor tool to get recommendations for creating materialized views and materialized view logs.
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As I mentioned earlier in this chapter, the CBO doesn t always use the same execution strategies. Changes in Oracle versions or changes in the initialization parameters concerning memory allocation may force the CBO to modify its plans. You can use Oracle s plan stability feature to ensure that the execution plan remains stable regardless of any changes in the database environment. The plan stability feature uses stored outlines to preserve the current execution plans, even if the statistics and Optimizer mode are changed. The CBO uses the same execution plan with identical access paths each time you execute the same query. The catch is that the query must be exactly identical each time if you want Oracle to use the stored plan.
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Caution When you use stored outlines to preserve a currently efficient execution plan, you re limiting Oracle s capability to modify its execution plans dynamically based on changes to the database environment and changes to the statistics. Ensure you use this feature for valid purposes, such as maintaining similar plans for distributed applications.
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On the face of it, the stored outline feature doesn t seem impressive. Let s consider a simple example to see how a stored outline could be useful in a real production environment. Suppose you have a system that s running satisfactorily and, due to a special need, you add an index to a table. The addition of the new index could unwittingly modify the execution plans of the CBO, and your previously fast-running SQL queries may slow down. It could conceivably take a lot of effort, testing, and time to fix the problem by changing the original query. However, if you had created stored outlines, these kinds of problems wouldn t arise. Once Oracle creates an outline, it stores it until you remove it. In the next section you ll examine how to implement planned stability in a database.
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