OpenEdge Data Management: DataServer for Microsoft SQL Server

The DataServer Tutorial
7–30
Table 7–7: Generate Delta.sql OpenEdge to MSS utility (3 of 3)
Interface element Description
For field widths use: When pushing fields to a foreign data
source, you can select one of two primary
field format options:
• Width — Uses the value of the
_width field in the _field record.
• 4GL Format — Use the value of the
_format field in the _field record.
(default)
If you select the 4GL Format option,
you have an additional setting to
define:
• Expand x(8) to 30 —This setting is
on by default to indicate that the
format for the character fields
defined as x(8) will be created as 30
characters.
Note: You cannot use the Expand x(8)
to 30 setting with the Width option.
For Create RECID use: Select either Trigger or Computed
Column. Trigger is selected by default.
Computed Column is preferred as it
offers greater reliability, but is only
available for MS SQL Server 2005 and
later.
3. Choose OK. The utility generates a delta.sql file and, optionally, a delta.df file.
When this step is performed for an MS SQL Server DataServer, and the incremental
update procedure includes changing an existing field from INTEGER to INT64 in the schema
holder, the DataServer supports the update process through the ALTER TABLE ALTER
COLUMN statement. If a column is part of an index, the incremental schema migration utility
generates a script to drop any indexes that contain the column, change the column’s data
type to BIGINT, and then re-adds the indexes. During this process, the utility uses the index
definitions defined in the schema holder.
4. After running the utility, you must apply the SQL that the utility generates to the MS SQL
Server database and load the new delta.df file into the original schema holder so that it
is synchronized with the modified MS SQL Server database.
Note that if you updated an existing field from INTEGER to INT64 as described in Step 3 of
this procedure, you also must confirm that none of the data is lost.
The Incremental Schema Migration utility generates SQL that will create objects in the MS SQL
Server database that are compatible with OpenEdge. Table 7–8 shows that the utility creates the
same objects as the OpenEdge DB to MS SQL Server migration utility.