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Why It Is Not Recommended to Use Objects to Store Data
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Now that we ve looked at how we can use either varrays or nested tables to store data, let s summarize the various reasons for not doing so in the first place. In the case of nested tables, the following are the major disadvantages of using them to store data in tables: Oracle ultimately stores nested tables data in the relational tables. The overhead of doing so comes in the form of hidden columns, which may be mostly extraneous had we decided to use simple relational schema. For example, Oracle internally created two hidden columns of 16 bytes each in the parent table and the hidden nested tables as part of its attempt to simulate the foreign key relationship. These two columns are thrust upon the user. In the equivalent relational schema, you would simply have created a foreign key on the child table. You also have the flexibility of creating a sequence-based column as a primary key if need be. The bottom line is that the two hidden columns take additional (unnecessary, in most cases) space in your schema and constrain your design choices.
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Note You can improve the nested table performance and reduce the overall storage incurred by
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creating the nested tables as index-organized tables with the compress option in the first place. However, all other disadvantages mentioned in this section still hold true. For more details on using index-organized tables for creating nested tables, please see section Nested Table in an IndexOrganized Table (IOT) in Oracle Database Application Developer s Guide Object Relational Features (10g Release 1).
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CHAPTER 8 ORACLE OBJECTS: AN OBJECTIVE ANALYSIS
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The code becomes overly complex if you use nested tables. You have to be aware of the nested table type, the nested table column in the parent table, and the internally created relational table where the nested table column data is actually stored. Moreover, the syntax of retrieving, inserting, and modifying data becomes more complicated, as you saw in the examples presented in earlier sections of this chapter. The hint nested_table_get_refs (or the equivalent exotic syntax using a combination of the table and cast keywords) needs to be used if you want to select, insert, delete, or update the individual columns. The fact that in the majority of cases you do need to manipulate the child table contents independent of the parent tables and end up using this hint really begs the question as to why you need to use nested tables in the first place. Why not simply create a relational parent and child table instead The data stored in tables containing nested table columns may not be accessible to many third-party tools that don t understand the syntax to retrieve and store data in them. Your application may become less open and accessible from third-party tools that understand only the more standard relational SQL. DMLs can run substantially slower and scale much less when you use nested tables rather than relational tables. We will do a comparison of different alternatives later in section Object Views vs. Relational Tables vs. Nested Tables to establish this fact. Most of the preceding arguments hold true in principle when you use varrays in tables as well. In addition, varrays are even less flexible when it comes to updating them, since they don t allow selective updates; you have to replace the entire varray even if you want to change only one value in the varray. Besides, you can t create indexes on individual varray object columns. Thus, you can conclude that using nested tables or varrays as a mechanism to persist your data isn t really a good idea. The question becomes, is there a middle ground In other words, can you have the flexibility of storing data in relational tables, and yet access them as objects when needed Object views, covered in the next section, may provide you with one such mechanism.
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