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If you think that the optimizer should have used an index instead of doing a full table scan, then perform the following steps: 1 Views in a query sometimes prevent the use of indexes Check to make sure that the execution plan shows that the correct indexes are being used..

To access data by forming object views on top of existing relational schema: Object views are views built on top of relational tables, such that the data in the view is accessed as if the underlying tables were defined as tables with object type columns. When you use object views, you can potentially get the best of both worlds: You can use queries against object views to retrieve data as objects directly, while retaining the flexibility of using SQL directly on the underlying relational tables when required. Toward the end of this chapter, we ll compare relational tables, tables containing object types as columns, and object views when used to store data. We ll compare these three techniques in terms of performance and code maintainability. This chapter begins with a brief introduction to Oracle objects and collections in the next section.

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2. If you think heavy data skew is in the table, use histograms to provide Oracle with a more accurate representation of the data distribution in the table. The CBO assumes a uniform distribution of column data. The CBO may forego the use of an index even when a column value is selective, because the column itself is unselective in nature. Histograms help by providing the CBO with an accurate picture of the column data distribution. I discuss histograms later in this chapter, in the section Using Histograms. 3. If Oracle is still refusing to use the index, force it to do so by using an index hint, as explained in the section Using Hints to Influence the Execution Plan later in this chapter.

It isn t always obvious why Oracle doesn t use an index. For example, Oracle may not use an index because the indexed columns are part of an IN list, and the consequent transformation prevents the use of an index.

If you use a WHERE clause such as WHERE last_name LIKE '%MA%', the optimizer might just decide to skip the index and do a full scan of the table because it needs to perform a pattern match of the entire LAST_NAME column to retrieve data. The optimizer correctly figures that it will go ahead and look up just the table, instead of having to read both the index and the table values. For example, if a table has 1,000 rows placed in 200 blocks, and you perform a full table scan assuming that the database has set the DB_FILE_MULTIBLOCK_READ_COUNT to 8, you ll incur a total of 25 I/Os to read in the entire table. If your index has a low selectivity, most of the index has to be read first. If your index has 40 leaf blocks and you have to read 90 percent of them to get the indexed data first, your I/O is already at 32. On top of this, you have to incur additional I/O to read the table values. However, a full table scan costs you only 25 I/Os, making that a far more efficient choice than using the index. Be aware that the mere existence of an index on a column doesn t guarantee that it will be used all the time. You ll look at some important principles to make your queries more efficient in the following sections.

Although Oracle terms the object features as object-relational (mainly in the context of using objects in tables to store data), Oracle objects support many traditional OO features. Chief among these are inheritance, polymorphism, and substitutability of types in an object type hierarchy. Oracle s implementation of the encapsulation feature, though, is undermined considerably by the fact that it does not support the equivalent of Java private or protected variables and methods in objects as of Oracle 10g Release 1. This section will introduce you to objects and collections, and you ll examine the syntax of using these objects in your SQL and PL/SQL code. You ll also briefly look at how to use objects and collections in tables, and the associated syntax to access and manipulate data stored in object type columns in tables. First up is a discussion of the fundamental concept of object type.

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