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How to perform an incremental database schema update.
Сведения.
Номер статьи 000021774.
Environment Product: OpenEdge Version: All supported versions OS: All supported platforms.
Question/Problem Description.
Steps to Reproduce.
Clarifying Information.
Error Message.
Defect/Enhancement Number.
Resolution.
Creating an incremental 4GL data definitions file Loading updated ABL data definitions What is an incremental data definitions file ?
An incremental data definitions file is a data definitions file that contains the schema differences between two databases. When the incremental data definitions file is loaded into a target database, the target database will then have the same schema as the source database. For example, a delta.df would be used to upgrade a production database to the same schema as a development database when deploying new compiled code.
What does the Create Incremental .df File Option do? In order to create the comparative schema definitions file (delta.df) two databases need to be connected The routine compares the data definitions in the nonempty copy (eg a production database) to the current database schema (eg the development deployment database) and creates a new data definitions file with the differences. The new delta.df file contains a record for every difference between the two schemas. The differences include any added, renamed, changed, or deleted table, field, or index. If a table, field, or index exists in the old database but not in the new schema, the Data tool asks if the object was renamed in which case the ‘new name’ needs to be selected. Otherwise, answering ‘no’, a record appears in the new .df file marking the object as deleted. If the new schema includes a new, unique, active index, the Data tool prompts to deactivate it. If the unique index is not deactivated and there are duplicate key field entries in the old database, the system aborts the subsequent load of the new definitions into the old database. If the unique index is deactivated, the load procedure defines the new index but does not create the unique index keys. Inactive indexes can then be activated after the schema update. If the data type of the extent of a field has changed, the Data tool writes a DROP statement to the .df file to delete the existing field, and then an ADD statement to re-create the field with its new definition. When the field is deleted from the database, the contents of that field are also deleted. To save the contents of the field, before using the incremental load procedure to update the rest of the schema, including deleting the obsolete old field: First save the data before running this procedure, or Rename the old field, create a new field separately, and write an ABL procedure that transfers the data from the old field to the new field. To create an incremental data definitions file:
1. Access the appropriate Data tool (the graphical interface Data Administration or the character interface Data Dictionary tool)
2. Connect to the source database. The source database is the database that has the new, modified schema definitions needed for the update:
Choose: Database > Connect Database . The Database Connect dialog box appears. Enter the name of the source database to connect to and choose OK. The Data tool connects to the database and returns to the Data tool's main window.
Connect to the target database. The target database is the database to update schema definitions from the source database. Once the second database has been connected to, the Select Working Database dialog box appears. Select the source database as the working database and choose OK.
3. Choose: Admin> Dump Data and Definitions> Create Incremental .df File . The Data tool lists all connected databases except the working database. Select the target database and choose OK.
4. The Data tool prompts for a file to write the differences. The default filename is delta.df , which is why 'incremental definitions" are often referred to as "a delta.df". Enter the location and name of the .df file and choose OK. The Data tool displays the file, field, sequence, and index names as it compares the databases, prompting clarification on differences found as needed.
6. After comparing the databases, the incremental definitions file is created and the Data Administration tool or the Data Dictionary returns to the main window.
To load an incremental data definitions file:
Before making changes to an existing database, ensure there is a valid full backup.
1. Connect to the target database If continuing from the same Data Tool session as the above “Create delta.df” Steps outline: Choose: Database > Select Working Database Otherwise Choose: Database > Connect Database.
2. Load the updated data definitions Choose: Admin > Load Data and Definitions > Data Definitions (.df files) . The Load Data Definitions dialog box appears. Enter the incremental definitions file (delta.df) and choose OK.
3. The Data tool updates the target (old) database schema to match the modified schema.
4. If any indexes were added deactivated, re-create data in any of the unique indexed fields as required to avoid duplicate keys, then reactivate all inactive indexes with PROUTIL IDXBUILD or IDXACTIVATE.

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