Solution Guide for Migrating Oracle on UNIX to SQL Server - Willy .Net

88Developing: Databases — <strong>Migrating</strong> Schemas●●●●●●Database name. Naming is constrained by the same rules as identifiers. Ameaningful name can be used and need not be the same as the name of the<strong>Oracle</strong> schema being migrated.Database owner. By default, the user who created the database becomes thedatabase owner (dbo). The owner can be changed using sp_changedbowner. Tomimic the <strong>Oracle</strong> schema, a login with the same name as the schema can bemade the database owner. A more detailed account of the implications of databaseowner and database object owner is provided in the "Qualifiers and NameResolution" section later in this chapter.Filegroups. These are the equivalents of tablespaces. A default primary filegroupis created during the database creation.Primary file. Every database is created with a default primary file belonging to thedefault primary filegroup identifiable by the .mdf file name extension. The primaryfile contains startup in<strong>for</strong>mation <strong>for</strong> the database and is used to store user data justas any other datafile. Only the size and growth characteristics can be changed.Secondary files. Additional files can be created in a database and associated withthe primary file group or any additional filegroup. The recommended file nameextension <strong>for</strong> secondary files is .ndf.Transaction log. Hold rollback and redo in<strong>for</strong>mation required to recover thedatabase. Notice that, unlike <strong>Oracle</strong>, where rollback segments and redo logs arecentral to the instance, every database has at least one transaction log.Transaction logs are not part of any filegroup.There are two ways to create a new database using Enterprise Manager: using theDatabase Properties dialog and by using the Create Database Wizard. An example ofeach of these procedures is provided here. To create a database using the Database Properties dialog, follow thesesteps:1. Right-click Databases, and then left-click New Database, or right-click Server(Server Name\Instance Name), then right-click New, and then left-click Database.2. In the Database Properties window, enter the database name in the Generalpane, the datafile and filegroup configuration in the Data Files pane, and thetransaction log configuration in the Transaction Log pane. To create a new database using the Create Database Wizard, follow thesesteps:1. Expand a server group, and then expand the server in which to create a database.2. On the Tools menu, click Wizards.3. Expand Database.4. Double-click Create Database Wizard.5. Complete the steps in the wizard.SQL Server also offers the CREATE DATABASE statement <strong>for</strong> creating databases.