INFO: General Information on the Visual FoxPro Upsizing Wizard (136772)

MORE INFORMATION

• The Upsizing Wizard works only with Microsoft SQL Server versions 4.21a, 6.0, and 6.5.
• To use the Upsizing Wizard with Microsoft SQL Server version 6.0, the SQL Server ODBC driver that ships with Microsoft SQL Server version 6.0 must be installed, or to use Microsoft SQL Server version 6.5, the SQL Server ODBC driver that ships with Visual FoxPro 5.0 or Visual Studio 97 must be installed.
• Make sure the device, database, and log, on SQL Server are large enough for the tables to be upsized. Visual FoxPro tables typically use more space on SQL Server than their local equivalents.
• When you create a new device or database and log, first upsize a small table or a test table. Then re-run the Upsizing Wizard before commencing with the upsizing of a .dbc file that contains large (or a large number) of tables.
• When upsizing large tables, set the SQL Server option 'truncate log on chkpt' to avoid 'log is full' problems. You can do this from within Visual FoxPro by using these commands:

        hDBC=SQLCONNECT([cDataSourceName, cUserID, cPassword])
        ?SQLEXEC(hDBC, 'use master')
        ?SQLEXEC(hDBC, 'sp_dboption <db name>, trunc, true')
  							

• To upsize rules and defaults properly, create them using Visual FoxPro expressions that can be mapped to corresponding expressions in Transact SQL. There is a list of the supported expressions in the Professional Features Guide, Chapter 2, Expression Mapping, page 37. This means that user-defined functions (UDFs) should not be used for rules and defaults that need to be converted to stored procedures in SQL Server.
• Consider the fact that when you select the 'Create Remote Views on Tables' option, the view created is updateable by default, and the default WHERE option in the Update tab of the view is 'Key and Modified' fields. In the following cases, this can cause a problem:
  
  
  • If a compound key has been used as part of a default join condition (relation) for the local table, the Upsizing Wizard will not be able to pass a key column name to SQL Server. The appropriate Key and Updateable column information will have to be set by clicking MODIFY VIEW in the Update tab of the View Designer.
  • If the table being upsized contains Memo or General fields, the WHERE option in the Update tab of the view must be changed to Key and Timestamp.
• Decide which columns should accept NULL values, and modify the structure on the local tables to designate this before upsizing.