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CHAPTER 12 DATATYPES
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Now, since ROWIDs can change over time (since they are no longer immutable), it is not recommended to physically store them as columns in database tables. That is, using a ROWID as a datatype of a database column is considered a bad practice and should be avoided. The primary key of the row (which should be immutable) should be used instead, and referential integrity can be in place to ensure data integrity is preserved. You cannot do this with the ROWID types you cannot create a foreign key from a child table to a parent table by ROWID, and you cannot enforce integrity across tables like that. You must use the primary key constraint. Of what use is the ROWID type, then It is still useful in applications that allow the end user to interact with the data the ROWID, being a physical address of a row, is the fastest way to access a single row in any table. An application that reads data out of the database and presents it to the end user can use the ROWID upon attempting to update that row. The application must use the ROWID in combination with other fields or checksums (refer to 7 Concurrency and Multi-versioning for further information on application locking). In this fashion, you can update the row in question with the least amount of work (e.g., no index lookup to find the row again) and ensure the row is the same row you read out in the first place by verifying the column values have not changed. So, a ROWID is useful in applications that employ optimistic locking.
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In this chapter, we ve examined many basic datatypes provided by Oracle; we ve seen how they are physically stored and what options are available with each. We started with character strings, the most basic of types, and looked into considerations surrounding multibyte characters and raw binary data. Next, we studied the numeric types, including the very precise Oracle NUMBER type and the new floatingpoint types provided with Oracle 10g and later. We also gave consideration to the legacy LONG and LONG RAW types, concentrating on how you might work around their existence, as the functionality provided by these types falls far short of that provided by the LOB types. Next, we looked at the datatypes capable of storing dates and times. We covered the basics of date arithmetic, a perplexing issue until you ve seen it demonstrated. Lastly, in the section on dates and timestamps, we looked at the INTERVAL type and how best to use it. The most detailed part of the chapter from a physical storage perspective was the LOB section. The LOB type is frequently misunderstood by developers and DBAs alike, so the bulk of the section was spent looking at how they are physically implemented as well as certain performance considerations. The last datatype we looked at was the ROWID/UROWID type. For what now should be obvious reasons, you should not use this datatype as a database column, since ROWIDs are not immutable and no integrity constraints could enforce the parent/child relationship. Rather, you want to store primary keys if you need to point to another row.
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C H A P T E R 13
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Partitioning
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Partitioning, first introduced in Oracle 8.0, is the process of physically breaking a table or index into many smaller, more manageable pieces. As far as the application accessing the database is concerned, there is logically only one table or one index, but physically that table or index may comprise many dozens of physical partitions. Each partition is an independent object that may be manipulated either by itself or as part of the larger object.
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Note Partitioning is an extra cost option to the Enterprise Edition of the Oracle database. It is not available in the
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