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

164 Developing: Databases — <strong>Migrating</strong> the Data5. The file <strong>for</strong>mat characteristics are chosen in the next window. The file typeshould be ANSI, and the row delimiter should be {CR}{LF}. If column datavalues are quoted, it can be specified in the Text qualifier field. The delimitercharacter, which is a comma (,), is specified in the next screen.6. The Microsoft OLE DB Provider <strong>for</strong> SQL Server should be chosen as thedestination and the server and login in<strong>for</strong>mation provided <strong>for</strong> the targetSQL Server instance.DTS offers the option of executing the import, saving it to a DTS package andscheduling. For in<strong>for</strong>mation on how to schedule DTS packages, refer tohttp://msdn.microsoft.com/library/default.asp?url=/library/en-us/dtssql/dts_pkgmng_4hm6.asp.DTS from <strong>Oracle</strong> DatabaseThe steps in creating a DTS package to connect and import data directly from the <strong>Oracle</strong>database is very similar to the process described in the previous section. Instead ofpointing the source to a file, an <strong>Oracle</strong> database is specified through an OLE DB orODBC provider <strong>for</strong> <strong>Oracle</strong>. The DTS Import/Export Wizard can be launched from Enterprise Managerusing the following steps or using the DTS Import Wizard:1. Expand Server.2. Right-click Databases, click All Tasks, and then click Import Data.3. Click the Next button on the wizard's Welcome screen.4. The next window presented is <strong>for</strong> choosing the data source. In the Data Sourcedrop-down list, choose the Microsoft ODBC Driver <strong>for</strong> <strong>Oracle</strong>. Enter the <strong>Oracle</strong>database alias and login in<strong>for</strong>mation.5. The Microsoft OLE DB Provider <strong>for</strong> SL Server should be chosen as the destinationand the server and login in<strong>for</strong>mation provided <strong>for</strong> the target SQL Server instance.6. The next screen offers the option of copying data from a table (or view) or using aquery.7. If the table or view option is chosen, the next screen provides a list of tables andviews available <strong>for</strong> import. The destination table name and trans<strong>for</strong>mationin<strong>for</strong>mation has to be provided along with the source table/view.8. If query option is chosen, the next screen provides a window <strong>for</strong> entering the querystatement. The destination table and trans<strong>for</strong>mation can be entered in the nextscreen.9. The execution of the import can be done immediately or scheduled <strong>for</strong> a later time.Note DTS has the capability of reading the table description from the <strong>Oracle</strong> databaseand creating tables in SQL Server. The wizard has been found to be faulty in its choiceof equivalent data types <strong>for</strong> SQL Server tables.Data can be migrated directly out of the database instead of through an intermediary fileif the interconnect between the servers hosting the two databases is very fast. Also, noadditional storage is required <strong>for</strong> the data files on the two servers. Use of files can reducethe deployment time if the data export can be done in advance and staged <strong>for</strong> import.For a case study on incrementally loading tables using the SQL Server bulk load options,refer tohttp://www.microsoft.com/technet/prodtechnol/sql/2000/maintain/incbulkload.mspx.