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In this chapter, you examined several ResultSet enhancements that came with JDBC 2.0. You began by learning how to deal with SQL null values in a ResultSet object. You then looked at prefetching, scrollability, positioning, and updatability of result sets. You covered a technique for the common scenario of paging through a query s results, and you learned two methods of building a query dynamically when you don t know the number of bind variables at compile time. You also examined the interfaces ResultSetMetaData and DatabaseMetaData. Here s a summary of some of the key lessons you learned in this chapter: Prefetching can be a powerful tool to improve the performance of a query depending on how the query results are used. It is especially useful if you are trying to optimize the time required to retrieve all records of the query. It is less relevant if you are trying to optimize getting n rows out of a total of m rows in a query. I strongly recommend performing inserts, updates, and deletes using the Prepared Statement and CallableStatement interfaces instead of using the updatability feature of a ResultSet. This is mainly because the updatability feature puts too many restrictions on a query. Consider using the pagination technique discussed in the section Paginating Through a Result Set to implement scrolling backward and forward using a normal forward-only ResultSet. Again, this is mainly because scrollability of a ResultSet also puts many restrictions on a query.

Similarly, when you want to drop a tablespace, you just need to issue the DROP TABLESPACE command and the OMF datafiles are automatically removed by Oracle, along with the tablespace definition: SQL> DROP TABLESPACE finance01; OMF files are definitely easier to manage than the traditional manually created operating system files However, there are some limitations: OMF files can t be used on raw devices, which offer superior performance to operating system files for certain applications (such as Oracle Real Application Clusters) All the OMF datafiles have to be created in one directory It s hard to envision a large database fitting into this one file system You can t choose your own names for the datafiles created under OMF Oracle will use a naming convention that includes the database name and unique character strings to name the datafiles Oracle recommends using OMF for small and test databases.

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Normally, if you drop a datafile, the database won t have any references to the datafile, but the physical file still exists in the old location you have to explicitly remove the physical file yourself If you use OMF, Oracle will remove the file for you when you drop it from the database According to Oracle, OMF file systems are most useful for databases using Logical Volume Managers that support RAID and extensible file systems Smaller databases benefit the most from OMF, because of the reduced file-management tasks Test databases are another area where an OMF file system will cut down on management time You have to use operating system based files if you want to use the OMF feature; you can t use raw files.

You do lose some control over the placement of data in your storage system when you use OMF files, but even with these limitations, the benefits of OMF file management can outweigh its limitations in some circumstances..

racle is a relational database that supports objects Objects within Oracle make it possible to model real-world objects such as Customer, Order, etc as objects in a more intuitive fashion In this chapter, we ll first briefly cover Oracle objects and collections Next, we ll examine how objects can be used in Oracle applications in general Note that this chapter does not discuss how to access objects and collections from JDBC We ll cover that topic in detail in the next three chapters Instead, in this chapter, we ll look at the following topics: Introduction to objects and collections: We ll briefly walk through an introduction to the concepts of objects and collections The main purpose of the introduction is to cover enough material so that you (hopefully) don t have to refer to the Oracle manuals to understand this chapter s examples.

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