Tasks for Shadowing

Go Up to Shadowing

The main tasks in setting up and maintaining shadowing are as follows:

1. Creating a shadow.

   Shadowing begins with the creation of a shadow. A shadow is an identical, physical copy of a database. When a shadow is defined for a database, changes to the database are written simultaneously to its shadow. In this way, the shadow always reflects the current state of the database. For information about the different ways to define a shadow, see Creating a Shadow.

2. Activating a shadow.

   If something happens to make a database unavailable, the shadow can be activated. Activating a shadow means it takes over for the database; the shadow becomes accessible to users as the main database. Activating a shadow happens either automatically or through the intervention of a database administrator, depending on how the shadow was defined. For more information about activating a shadow, see Activating a Shadow.

3. Deleting a shadow.

   If shadowing is no longer desired, it can be stopped by deleting the shadow. For more information about deleting a shadow, see Dropping a Shadow.

4. Adding files to a shadow.

   A shadow can consist of more than one file. As shadows grow in size, files can be added to accommodate the increased space requirements. For more information about adding shadow files, see Adding a Shadow File.

Advance To:

• Advantages of Shadowing