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Oracle offers the online table redefinition feature, which lets you redefine objects like database tables online while users continue reading from and writing to them. You can use online data redefinition to create new tables with more efficient physical storage parameters, move tables to different tablespaces, reduce fragmentation in tables, and change a heap table into an index-organized table and vice versa, all while maintaining database availability and performance. The online data redefinition feature can enhance both data availability and disk usage. Both the newly redefined table and the original table continue to exist together until the DBA decides to switch over to the newly redefined table. The length of the switching process is extremely brief and doesn t depend on table or index size or the complexity of the object redefinition. If you have materialized views and materialized logs defined on a table, you can t redefine them online. During the redefinition process, local materialized logs are maintained and changes to the master table are tracked using snapshot logs.

The Oracle Open Database Connectivity (ODBC) driver is your usual ODBC vendor driver for use with Windows clients, just as Microsoft supplies one for all their data formats. .NET programs can access the Oracle databases through ODBC DB .NET, which uses ODBC.

Note Whenever possible, use the Segment Advisor for shrinking segments and reclaiming unused space below the HWM. However, if a segment doesn t qualify for the use of the Segment Advisor, as is the case when you use dictionary-managed tablespaces or manual segment space management, use the online table redefinition technique to reorganize segment data. You also use online table redefinition if you plan on making logical or physical changes to any table attributes during the reorganization.

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The COM Automation feature gives Oracle the ability to work with COM Automation servers. With this feature you can instantiate objects from the COM Automation server, then get and set their properties and invoke their methods.

You can use online redefinition to perform a number of tasks that would have necessitated taking tables offline in early versions of Oracle. Using the online table redefinition feature, you can do the following: Add, drop, or rename columns. Transform table data.

Oracle integrates with Oracle Internet Directory, Microsoft Active Directory, and Windows native authentication so that you can centralize your Windows security policy and any other directorybased admin tasks.

Change data types of the columns. Rename table constraints. Change the original storage parameters. Reduce fragmentation in tables. Create a partitioned table out of a regular table online. Create an index-organized table (IOT) out of a regular table. Move a table to a different tablespace. The list of tasks you can perform using online redefinition is truly impressive, because you don t have to keep users from accessing the tables while you re performing these common tasks. The online table redefinition involves a simple sequence of steps: 1. Determine whether a table is a candidate for redefinition. 2. Decide on the structure of the new table, and create a new image of the table. 3. Start the redefinition process by using the DBMS_REDEFINITION package. 4. Create necessary constraints and triggers on the new table. 5. Perform periodic synchronization and validation of data in the new table. 6. Complete the redefinition of the table. You can perform online table redefinition using one of two methods: a primary key method and a ROWID method. The ROWID method is more complex, and Oracle recommends you use the easier primary key method, which requires that the original and the redefined tables have the same primary key columns. In the following sections, you ll see how to perform online table redefinition using the default primary key method.

Microsoft Transaction Server (MTS) serves as an application server for COM objects and transactions under distributed environments. MTS, also known as COM+ and .NET Enterprise Services, consists of the Microsoft distributed transaction coordinator. In this case, Oracle databases are used as MTS resource managers, which means that they provide client-side connection pools to MTS. To coordinate transactions among the distributed resource managers, MTS uses a Distributed Transaction Coordinator (DTC). The Oracle Services for MTS coordinate with the DTC to enable the use of the database to coordinate transactions. The Oracle Services for MTS run on a Windows server, but you can use them with an Oracle database on any operating system platform.

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